Is it difficult to observe in recent years "Kogarashi No. 1" will blow early next week. At the same time, the coldest air will arrive this autumn [Weekly Weather]

2025/10/23 12:16

This week, the autumn rain front stagnated on the southern coast of Honshu, and cold air flowed in from the north, causing autumn to deepen all at once.

Towards the weekend, a low pressure system will form above the autumn rain front,
and is expected to continue moving north as it develops.

At the beginning of next week, the atmospheric pressure around Japan will be high in the west and low in the east,
northern winds will blow, and Kogarashi No. 1 may be observed.



"Kogarashi No. 1" is the first strong north wind that blows that year.

It is announced only in the Tokyo and Kinki regions, but the conditions for
announcement are slightly different.

For example, in the Tokyo region, when a winter-like atmospheric pressure pattern occurs from mid-October to the end of November, and winds blow from the west-northwest to the north at a speed of 8 m/s or more, the Japan Meteorological Agency recognizes this as a "Kogarashi" and announces the first Kogarashi No. 1.

On the other hand, in the Kinki region, the
period runs from the frost (around October 23rd) to the winter solstice (around December 22nd), and is announced when
winds from the north are observed at a speed of 8 m/s or higher in any of Osaka, Kobe, Kyoto, etc.



#Record of Kogarashi No. 1 (from 1951)#

[Tokyo region]
Earliest: October 13th (1988)
Latest: November 28th (1969, 1981)

*Kogarashi No. 1 will not be announced in 2018, 2019, 2021, and 2022.

[Kinki region]
Earliest: October 23rd (2020, 2021, etc.)
Latest: December 19th (2003)

*Kogarashi No. 1 was not announced in 1992

Due to the lack of period, atmospheric pressure distribution, and wind conditions,
Kogarashi No. 1 may not be announced in some years.

In particular, in recent years there have been an increasing number of years in which the Kogarashi No. 1 does not blow in the Tokyo area, and attention is focused on whether it will blow this year (2025).



At the beginning of the week, from the 27th (Monday) to the 28th (Tuesday), the strongest cold air of this autumn will flow over Japan.

Cold air with snow expected to fall in the mountains (0c at around 1500m)
is expected to move south to the San'in, Kinki, and Tokai regions.

In addition, the cold air that is expected to snow on the plains (below -6c at around 1500m above sea level) will completely cover Hokkaido,
It is likely that there will be places in Hokkaido, such as southern Hokkaido, where the first snow will be observed.
(So far, the first snow has been observed only in Wakkanai, Asahikawa, and Abashiri on October 20th)



However, this winter-like pressure distribution is temporary, and a high-pressure system is expected to emerge from the west on the 28th (Tuesday).

On the 29th (Wednesday), it will be sunny in many places around Honshu,
and the cold will ease.

Please be careful not to lose your physical condition, as there will be large differences in temperature from day to day and between morning and evening and during the day.

Typhoon No. 23 passes near the Izu Islands; unseasonably hot weather continues in western Japan and Okinawa (weather summary October 12, 2025 - October 18, 2025)

2025/10/23 06:48

This is a summary of the weather for this period (October 12th to October 18th, 2025).

#Summary of the weather for this period (October 12th to October 18th)
Average temperatures tended to be noticeably hotter, especially in western Japan and the Nansei Islands, which were easily covered by warm air, while many places in Hokkaido, which was susceptible to the effects of cold air in the upper atmosphere, remained at normal levels. Temperatures in eastern Japan were 2 to 4 C higher than normal, and in western Japan, mainly in Kyushu, temperatures were more than 5 C higher than normal.

Precipitation was higher than normal, especially in the Sea of Japan and Tokai regions from Tohoku to the San'in region, which were susceptible to the effects of low pressure and fronts. In Kanazawa, the amount of precipitation was about three times the normal amount, in Nagoya it was about 1.6 times the normal amount, and in Matsue it was about 2.6 times the normal amount. On Hachijojima Island in the Izu Islands, which was affected by Typhoon No. 23, rainfall was about 1.5 times higher than normal.

Sunshine hours were below normal in many places, as cloudy and rainy days continued from northern Japan to northern Kyushu, which were susceptible to the effects of cold air, low pressure, and fronts. On the other hand, southern Kyushu and the Nansei Islands were relatively unaffected by autumn rain fronts and cyclones, so they had fewer cloudy or rainy days and tended to have more sunshine hours than normal.



[About the weather during this period]
#Characteristics of pressure distribution
On the 12th, Typhoon No. 23 moved east-northeast south of Honshu, and at night moved west-southwest of Aogashima. In the Sea of Japan, a frontal low pressure system is moving eastward, and another low pressure system is moving northeast east of Japan. On the 13th, Typhoon No. 23 became a strong force and passed near the Izu Islands. An autumn rain front extended from southern China to the Sea of Japan. On the 14th, Typhoon No. 23 moved away from the sea east of Japan, and northern Japan was covered in high pressure. At around 9 a.m., a low pressure system formed above the autumn rain front and moved east-northeast across the Sea of Japan. On the 15th, a continental high-pressure system covered northern and eastern Japan, and the center of the high-pressure system moved east of Japan. An autumn rain front is stationary from central China to Kyushu and the Izu Islands. On the 16th, a frontal low pressure system developed and moved eastward from western Japan to the coast of eastern Japan. The front extends from western Japan to eastern Japan, and gradually moves southward. On the 17th, the low pressure system moved east of Japan, and another low pressure system formed near the northern part of the Korean Peninsula. The autumn rain front is stagnant in China. On the 18th, two low pressure systems accompanied by a front moved eastward through the Sea of Japan while developing. Typhoon No. 24 occurred off the east coast of the Philippines.

#Precipitation
On the 12th, it rained in western Japan, the Pacific side of eastern Japan, and the Izu Islands due to the influence of moist air from Typhoon No. 23. Heavy rain was observed in Kaiyo Town and Miyakejima, Tokushima Prefecture. On the 13th, Typhoon No. 23 passed near the Izu Islands. On Hachijojima, where the typhoon itself was covered with active rain clouds, heavy rain of 44.0 mm per hour was observed. On the 14th, active rain clouds formed over the Japan Sea side of western Japan, Hokuriku, and southern Tohoku due to the influence of a front approaching from the west and a low-pressure system, and heavy rain, breaking the record for October, was observed in Iki City, Nagasaki Prefecture, Kyoto, Maibara City, Shiga Prefecture, and other areas. On the 15th, rain fell widely from southern Tohoku to Kyushu and Okinawa due to the influence of the autumn rain front. In Aji, Shima City, Mie Prefecture, it rained very heavily, with an hourly rainfall of 50.0 mm. On the 16th, rain fell over a wide area due to the influence of a front and a low pressure system, with extremely heavy rain falling in Kaiyo Town, Tokushima Prefecture, Sakihama, Muroto City, Kochi Prefecture, and other areas. From dawn to dawn on the 17th, it rained in northern Japan and Hokuriku. In the afternoon, there was a wide area of high pressure, and many places were sunny. On the 18th, the area of rain spread due to the effects of low pressure and fronts, and heavy rain occurred in Goto City, Nagasaki Prefecture, and other parts of Kyushu.

#Temperature
On the 12th, midsummer air flowed into the sky over Kyushu, and Maeda Town, Kimotsuki, Kagoshima Prefecture, recorded a record high of 35.0 degrees Celsius, the latest extremely hot day on record. On the 13th, the lingering heat continued in areas west of the Tokai region. The number of midsummer sites reached 153, and the temperature in central Tokyo was 25.2c, the first summer day in five days. On the 14th, temperatures rose in western Japan due to warm air in the upper atmosphere and clear skies with sunshine. The severe heat continued, with temperatures reaching 33.5 degrees Celsius in Kosa Town, Kumamoto Prefecture, and 33.3 degrees Celsius in Naha. Announcement of flowering of pampas grass in Saga and Gifu. On the 15th, severe heat continued in western Japan in Shikoku, Kyushu, and Okinawa. Announcement of flowering of pampas grass in Kochi and Tsu. On the 16th, the unseasonably hot weather continued in western Japan and Okinawa, with the temperature in Nakasuji, Tarama Village, Okinawa Prefecture reaching 34.0 degrees Celsius, on the verge of an extremely hot day. On the 17th, the lingering heat continued in western Japan, with Kagoshima recording a temperature of 31.2c, the 15th midsummer day this month. Flowering of pampas grass was announced in Kobe, Shimonoseki, and Miyazaki. On the 18th, southerly winds heading towards a low pressure system in the Sea of Japan caused a Foehn phenomenon in areas on the Sea of Japan side, with temperatures around 30 degrees Celsius in the Sanin and Hokuriku regions. In Matsuyama City, the temperature was 30.4c, the second-latest midsummer day on record.

Latest 3-month forecast: From December onwards, winter-like atmospheric pressure patterns will become stronger, and the season will rapidly turn into winter.

2025/10/22 20:05

On the 21st, the Japan Meteorological Agency announced the latest three-month forecast, which provides an outlook on the weather for the next three months.



Due to the effects of global warming, the overall temperature of the atmosphere will be high.
Situations similar to La Nina are expected to continue, and sea surface temperatures are expected to be low in the central to eastern equatorial Pacific Ocean. Additionally, in the tropical Indian Ocean, sea surface temperatures will be higher in the east and lower in the west.
For this reason, the main areas where cumulonimbus clouds occur are from the Indian Ocean to the vicinity of the Philippines, and are expected to be less likely to occur near the international date line in the western Indian Ocean and the Pacific Ocean.

As a result of these effects, upper-level westerly winds will meander northward near the Eurasian continent, and from December onwards, they will meander southward near Japan, flowing slightly further south than normal. In addition, the Siberian High is expected to extend slightly to the southeast at times, and the Aleutian Low is expected to strengthen to the west.

Based on the above forecast results, there will be a period in December when the winter-type pressure pattern will become stronger, and the season will rapidly shift to winter from December onwards.



Looking at the average temperature forecast for three months, it is likely that there will be many places higher than normal in November, as westerly winds are expected to flow from the north. Precipitation will also remain at about normal levels in November. Okinawa/Amami is easily affected by fronts and humid air, and there are many cloudy and rainy days.



From December onwards, average temperatures will be at normal levels across the country, and there will be many cloudy, rainy, and snowy days from northern to western Japan, especially along the Japan Sea side. The Pacific coast of eastern and western Japan tends to have dry, sunny weather, so care must be taken when drying and handling fire.

Sea surface temperatures in the waters of Japan remain higher than normal. From December onwards, if the winter-like pressure pattern strengthens and strong cold air flows into the upper atmosphere, there is a possibility of heavy snow on the Sea of Japan side. The season moves at a rapid pace after December, so it's a good idea to prepare for winter early.

[Ocean summary] Typhoon No. 23 nears the Izu Islands, resulting in severe drought; Sea surface temperature in the Sea of ??Japan continues to be significantly higher than normal

2025/10/22 16:12

Sea surface temperatures near the Izu Islands had remained high for a long time, but due to the effects of Typhoon No. 23, which followed Typhoon No. 22, sea surface temperatures have returned to normal levels. When Typhoon No. 23 approached, the area around the Izu Islands was devastated.
The following is a summary of the ocean (October 12-18, 2025).



#Pressure distribution and waves
On the 12th and 13th, Typhoon No. 23 became a strong force and moved from the south of Japan to the vicinity of the Izu Islands.
Also, a low pressure system accompanied by a front moved eastward to the east of Japan and the Sea of Japan.
A major disaster occurred in the south of Japan, and on the 13th, a severe disaster occurred near the Izu Islands.
On the 14th, strong typhoon No. 23 moved eastward and moved away from Japan, but waves from the typhoon caused high waves in the Pacific side of eastern and northern Japan.
At 3 a.m. on the 15th, Typhoon No. 23 turned into an extratropical cyclone, but high waves continued in the east of Japan due to swells from the high wave area.
From the 16th to the 17th, a low pressure system accompanied by a front developed as it moved eastward from the Sea of Japan to the east of Japan, and on the 17th it settled east of Japan.



#Sea surface temperature
Sea surface temperatures in the Japanese waters continued to be significantly higher than normal, reaching a maximum of 4c.
On the continental side of the central Japan Sea, low pressure systems moved eastward one after another, causing sea surface temperatures to be slightly lower than normal.
In the East China Sea, the sea area continued to be much higher than normal, and in the Nansei Islands, the sea area continued to be higher than normal.
On the Pacific side, as Typhoon No. 23 moved eastward, sea areas near the Izu Islands expanded to normal levels, but other areas continued to have higher than normal sea areas.
Offshore Sanriku continued to be significantly higher than normal.
On the other hand, the temperature south of the Kuril Islands was slightly lower than normal.

Widespread rain over the weekend, rain and wind intensifying in some places; atmospheric pressure pattern high in the west and low in the east at the beginning of the week; snow in flat areas of Hokkaido

2025/10/22 12:28

# Autumn rain front stagnant, warning level of heavy rain expected in Okinawa until the 24th
# Widespread rain over the weekend; high pressure in the west and low pressure in the east at the beginning of the week
#Next week, cold air moving south again, with snow in both flat and snowy areas in Hokkaido



#Autumn rain front stagnant Okinawa is at risk of warning-level heavy rain until the 24th
This week, the autumn rain front will remain stagnant from the East China Sea to the south of Japan.
The front is stationary near Okinawa and Amami, and is expected to move slowly southward near the Izu Islands into tonight.
Also, a tropical cyclone will slowly move south of Okinawa today, the 22nd (Wednesday). The atmospheric conditions are expected to be extremely unstable due to the influence of the
front and tropical cyclones, and heavy rain is expected.
There is a risk of warning-level heavy rain in the vicinity of Okinawa Main Island, Amami, and the Izu Islands until the 23rd (Thursday), and in the Sakishima Islands until the 24th (Friday), depending on the level of front activity.





# Widespread rain over the weekend; atmospheric pressure will be high in the west and low in the east at the beginning of the week
On the 26th (Sunday), a low pressure system will form on a front stationary in the south of Japan, and is expected to move towards the east of Japan.
Also, a low pressure system with another front will advance near northern Japan.
Two low pressure systems and a front are expected to bring widespread rain over the weekend.
The atmospheric conditions will become unstable due to the influence of warm, humid air heading towards the low pressure system and the front, leading to stronger rain and wind in some places.
In particular, there is a risk of warning-level heavy rain again in the Izu Islands, which are close to Japan's southern front and low-pressure system, so please keep an eye on the latest information.
On the 27th (Monday), after the passage of a low pressure system and a front, a continental high pressure system will protrude near Japan, resulting in a high pressure system in the west and low pressure in the east.
The flow of cold air is expected to increase again.
Western and eastern Japan will also be affected by the cold air, and temperatures will once again be at or slightly below normal, and there will be occasional rain on the Sea of Japan side.



#Next week Cold air is moving south again, and there are places in Hokkaido where it's snowy even on flat ground.A cold air will be in the skies over Hokkaido from tomorrow until around the 24th (Friday), and it is expected that there will be places where it will rain and snow today, the 22nd (Wednesday), and tomorrow the 23rd (Thursday).
Also, next week, the atmospheric pressure will once again be high in the west and low in the east, and the cold air will move southward, and there will be days when cold air with temperatures below -6c will cover Hokkaido at around 1500m.
On the 27th (Monday), it will rain and snow in Sapporo, and on the 28th (Tuesday) and 29th (Wednesday), more places in northern Hokkaido are expected to experience snow.
In the inland areas of northern and central Hokkaido, there is a risk of snow accumulating even on flat areas.
Please wear winter tires when driving.

Heavy rain warning from southern Kyushu to the Okinawa region and Izu Islands!

2025/10/22 09:40

The front has passed from near Taiwan, near Tanegashima, Yakushima, and the Izu Islands, and is almost stationary in the far east of Japan.
Also, a tropical cyclone is near the Sakishima Islands, and is slowly moving south-southwest.

As warm, humid air flows toward the front and tropical cyclone, atmospheric conditions are extremely unstable from the Izu Islands and southern Kyushu to the Nansei Islands.
From southern Kyushu to the Nansei Islands, there are places where extremely heavy rain is occurring, and heavy rain, flood, and wave warnings and landslide warning information have been issued in some places.
Also, in the Nansei Islands and Izu Islands, the ground has become loose in some places due to heavy rains.



The front will mostly remain stationary until the 24th, but it is expected to move slowly southward near the Izu Islands into the night of the 22nd.
Also, the tropical cyclone is expected to slowly move south of Okinawa on the 22nd, and move towards the Bashi Strait on the 23rd

As a result, extremely unstable atmospheric conditions are expected to continue from the Izu Islands and southern Kyushu to the Nansei Islands



###Rain Forecast
From southern Kyushu to the Nansei Islands and the Izu Islands, there will be heavy rain accompanied by thunder or very heavy rain, and there will be heavy rain in some places

The predicted one-hour rainfall on the 22nd will be 30 mm
in the Izu Islands.
Kagoshima Prefecture (excluding Amami region) 50 mm
Amami region 50 mm

Places with high rainfall per hour expected on the 23rd And
20mm

The 24-hour rainfall expected from 6:00 on the 22nd to 6:00 on the 23rd is high,
Izu Islands 80mm
Southern Kyushu 180mm
Amami region 150mm
Okinawa region 150mm
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After that, the predicted 24-hour precipitation from 6:00 on the 23rd to 6:00 on the 24th is expected to be 50 mm in the Izu Islands


# ##Disaster prevention matters
From the southern Kyushu/Amami region to the Nansei Islands and Izu Islands, please be extremely careful about landslides on the 22nd, and be careful of inundation of low-lying land, rising water levels, and flooding of rivers
If rain clouds develop more than expected or if developed rain clouds continue to flow in, warning-level heavy rain may spread over the area and extend the period.
Even after this, from the Izu Islands until the 23rd and the Nansei Islands from the 24th, please be careful of landslides, flooding of low-lying areas, and rising river waters.

Warning-level heavy rain warning for Kagoshima to Okinawa region and Izu Islands. Possibility of linear precipitation belt occurring

2025/10/21 17:55

A front extends east to west from the East Sea of Japan to the East China Sea, passing through the South Sea of Japan and south of Kyushu.
Also, there is a tropical cyclone around the Sakishima Islands that is moving southwest.
Currently, there are places in the Okinawa region where heavy rain warnings and wave warnings have been issued.



The front will remain stationary until tomorrow, the 22nd (Wednesday).
As warm, humid air flows toward the front, atmospheric conditions are expected to become extremely unstable in the Okinawa region and Izu Islands until the 22nd.

A linear rain band will form in the Izu Islands until dawn on the 22nd (Wednesday), and the risk of heavy rain disasters may increase rapidly.
Please be extremely cautious of landslides, flooding of low-lying areas, and rising and flooding rivers.
Also, please be careful of strong gusts such as lightning and tornadoes in the Nansei Islands and Izu Islands.



In Kagoshima Prefecture, please be careful of landslides, flooding of low-lying land, and rising river waters late on the night of the 22nd.
In Kagoshima Prefecture, please be careful of strong gusts of wind that could cause lightning and tornadoes late into the night of the 22nd.

In the Okinawa main island region, please be careful of landslides on the 21st (Tuesday).
In the Yaeyama region, heavy rain is expected to reach warning level.
Please be careful of flooding in low-lying areas on Wednesday the 22nd.
In the Yonaguni Island region, please be careful of high waves accompanied by swells into the 22nd (Wednesday).



###Rain report
Precipitation amount from the start of rain (00:00 on the 19th) to 16:00 on the 21st (preliminary figures from AMeDAS)
Okinawa main island region
Hikawa, Naha City 173.0 mm. *Includes missing values
Yomitan 153.5 mm.
Nanjo City Thread Count 152.0mm.

Miyakojima region
Tarama Airport 111.5mm.
Shinshiro, Miyakojima City 53.0mm.

Yaeyama region
Ishigaki Airport 214.5mm.
Ibarama, Ishigaki City 185.5mm.
Taketomi-cho Uehara 154.5mm.

###Rain Forecast
In the Izu Islands, there will be heavy to very heavy rain, with localized torrential rain leading to heavy rain in some places.
The predicted 24-hour precipitation from 18:00 on the 21st to 18:00 on the 22nd is 150 mm in Kagoshima Prefecture (excluding the Amami region).
Amami region 100mm.
Okinawa Main Island Region 100mm.
Miyakojima region 100mm.
Yaeyama region 180mm.
Izu Islands 200mm.

If a linear precipitation band occurs, there is a risk of even more rainfall locally.
The following are the regions and periods where linear precipitation bands may occur and the risk of heavy rain disasters may increase rapidly.
Kanto-Koshin region, Izu Islands, until dawn on the 22nd

### Wave forecast
Wave height expected on the 21st
Miyakojima region 4 meters with swells.
Yaeyama region 6 meters with swells.

Wave height expected on the 22nd
Miyakojima region 4 meters with swells.
Yaeyama region 6 meters with swells.

Wave height expected on the 23rd
Miyakojima region 4 meters with swells.
Yaeyama region 5 meters with swells.

###Disaster Prevention Matters
In the main island of Okinawa, heavy rain is expected to occur in some places through the 22nd.
Please be careful of landslides on the 21st.
In the Yaeyama region, extremely heavy rain will fall in places through the 22nd, and heavy rain is expected to reach warning level on the 22nd.
Please be careful of flooding in low-lying areas on the 22nd.
Also, depending on the degree of rain cloud development, there is a risk of warning-level heavy rain in the Okinawa main island region and Sakishima Islands until around the 24th.
Please be careful of landslides, flooding of low-lying areas, and rising river waters.
The Yonaguni Island region is expected to experience heavy swells through the 22nd.
Be wary of high waves with swells. In the Ishigaki Island and Miyako Island regions, swells are expected to continue into the 23rd.
Please be careful of high waves accompanied by swells.

In the Okinawa main island region and the Sakishima Islands, please be careful of strong gusts of wind that could cause lightning and tornadoes through the 22nd.
If there are signs of a developing cumulonimbus cloud approaching, please take every precaution to ensure your safety, such as moving inside a building.

In the Izu Islands, please be extremely cautious of landslides, flooding of low-lying areas, and rising and flooding rivers.
Also, please be careful of strong gusts such as lightning and tornadoes in the Nansei Islands and Izu Islands.
If there are signs of a developing cumulonimbus cloud approaching, please take every precaution to ensure your safety, such as moving inside a building.

Front stagnates south of Honshu; linear rain belt may form in Izu Islands

2025/10/21 08:11

Today, the 21st (Tuesday), the autumn rain front is stationary in southern Honshu. A tropical cyclone formed near the Sakishima Islands around 3 a.m. and is slowly moving southwest.

Warm, humid air from around the tropical cyclone will flow toward the front, and with the added influence of a pressure trough in the upper atmosphere, atmospheric conditions are expected to become extremely unstable in Okinawa, Amami, and the Izu Islands, which are close to the front.
Also, the Pacific side of western and eastern Japan will experience cloudy and unrefreshing weather, with some places experiencing showers and thunderstorms.

In Okinawa and Amami, there will be heavy rain accompanied by thunder from before noon to early afternoon, and in the Izu Islands, localized areas are expected to see more than 80 mm of rain per hour from evening to early night. There is little movement of the front into tomorrow, the 22nd (Wednesday), so there is a risk that heavy rain will continue in similar areas.

Especially in the Izu Islands, from the evening of today, the 21st, to late at night, there is a possibility that a linear rain band will develop, and the risk of heavy rain disasters will increase rapidly. If a linear precipitation band occurs, the total rainfall may be much higher than expected.
Please be extremely cautious of landslides, flooding of low-lying areas, rising water levels and flooding of rivers, etc.



#Rain forecast (Izu Islands)

The predicted hourly precipitation on the 21st is high in places,
Izu Islands 80 mm

The predicted hourly precipitation on the 22nd is high in places,
Izu Islands 40 mm

The 24-hour precipitation expected from 6 o'clock on the 21st to 6 o'clock on the 22nd is high in places
Izu Islands 200 mm

Then, the 24-hour precipitation expected from 6 o'clock on the 22nd to 6 o'clock on the 23rd is high in places
Izu Islands 80 mm

Winter news continues to arrive in Hokkaido: First snow observed in Wakkanai, Asahikawa, and Abashiri

2025/10/20 20:17

Today, the 20th (Monday), we observed the first snow in Wakkanai, Hokkaido. This was the first snowfall of the season observed at weather observatories across the country. On the same day, it was announced that the first snow had been observed in Asahikawa and Abashiri.

Also, the first snowfall was observed at Mt. Yokotsu in Hakodate, Mt. Washibetsu in Muroran, and Mt. Teine in Sapporo.

Today, on the 20th, the area around Honshu had a wintry-type atmospheric pressure pattern of high in the west and low in the east, and in Hokkaido, cold air flowed in with temperatures below -6c at around 1500m, which is a guideline for snow to fall even on flatlands. Streak clouds that are seen in winter have formed over the Sea of Japan, and some of these clouds have also covered the land of Hokkaido, and it is thought that the rain has turned to snow due to the drop in temperature.

#First snow
Asahikawa 1 day later than average, 1 day later than last year
Wakkanai 1 day later than average, 1 day later than last year
Abashiri 10 days earlier than average, 1 day later than last year

#First snow
Hakodate Yokotsudake 9 days earlier than average, 18 days earlier than last year
Muroran Mt. Washibetsu: 11 days earlier than normal, same as last year
Sapporo Teineyama: 2 days later than normal, same as last year



In Hokkaido, there will be places in Hokkaido tomorrow morning when cold air with temperatures below -6 C will flow in at around 1500m above the ground, and there will likely be places where it will snow even in the flatlands of the inland areas, especially in the mornings and evenings. There is a possibility of snow accumulation in high altitude areas, so please be careful of road conditions when driving.

Autumn rain front stagnates. Warning-level heavy rain until the 24th in Okinawa and Izu Islands. Cloudy and rainy on the Pacific side of Honshu. 16c expected in the city. Snowy days in inland Hokkaido. [Weekly weather forecast]

2025/10/20 12:58

#Autumn rain front stagnates, warning level of heavy rain expected until 24th in Okinawa and Izu Islands
#Western and eastern Japan also suffers from sluggish weather on the Pacific side, quickly turning into autumn air
#Hokkaido cold, with snow days inland



#Autumn rain front stagnant There is a risk of warning-level heavy rain in Okinawa and Izu Islands until the 24th
The autumn rain front will remain stationary from the East China Sea to the south of Japan until around the 24th (Friday).
Okinawa/Amami and the Izu Islands will be affected by the front on many days, and intermittent rain is expected.
On Miyakejima, there are places where the ground has become loose due to the rain that has fallen so far, so the risk of landslides may increase even with low rainfall.
Also, the atmospheric conditions will be unstable due to the influence of humid air, and heavy rain may occur.
Depending on the level of activity of the front, there is a risk of warning-level heavy rain, so please pay attention to the latest information.





#Weather is sluggish on the Pacific side of western and eastern Japan as well. Autumn air changes all at once.
The autumn rain front is stationary in the south of Honshu, and there will be many days of sluggish weather with cloudy weather and rain in western and eastern Japan, especially on the Pacific side.
From the 24th (Friday) to the 25th (Saturday), high pressure is expected to move from the Sea of Japan to the east of Japan, and more areas near Honshu will be exposed to sunlight.
However, from the 26th (Sunday) to the 27th (Monday), the front in the south of Japan will move northward and a low pressure system will form above the front, moving from the south of Japan to the east of Japan and moving north.
It is expected to rain again in more places.
Western Japan will experience midsummer days over the weekend, and there will be many days suddenly enveloped in the autumn air.
Eastern Japan, including the Kanto-Koshin region, will have many days with temperatures at or below normal, and the Tohoku region is expected to have many days with temperatures lower than normal.
In central Tokyo, the 22nd (Wednesday) will be as sunny as mid-November, with a maximum temperature of 16c due to rain and cold northeast winds.
Please be careful not to catch a cold due to the sudden cold.



#Hokkaido Cold air with snow days inland
Cold air is expected to move southward near Hokkaido into the second half of the week.
There will be days when cold air with temperatures below -6 C will cover Hokkaido at around 1500m above the ground, and if it rains, it will snow even in flat areas inland.
In particular, from tonight until the beginning of tomorrow, the 21st (Tuesday), cold air with temperatures below -6 degrees Celsius is expected to move southward to the Pacific side of Hokkaido at an altitude of around 1,500 meters.
In the inland areas of northern and central Hokkaido, there is a risk of snow even on flat areas.
Please wear winter tires when traveling along mountains or through mountain passes.