The rainy season has ended rush hour Kanto, Koshin, Hokuriku, and southern Tohoku. From the three-day holiday, the days of extreme hot days and tropical nights gradually began to rise, and there were dangerous heat that exceeded the body temperature.

2025/07/18 11:18

Today, the 18th (Friday), the Japan Meteorological Agency and local meteorological observatory announced that the rainy season is expected to have ended in the Kanto-Koshin region, the Hokuriku region, and southern Tohoku region.
Normal age difference Last year
Kanto-Koshin region: 1 day earlier Same
Hokuriku region: 5 days earlier 13 days earlier
Southern Tohoku: 6 days earlier 14 days earlier

Both the rainy season ended earlier than normal, and compared to last year the rainy season ended about two weeks earlier in the Hokuriku region and southern Tohoku.

#Previous Summer The dangerous heat of exceeding body temperature just after the rainy season ends
Today, the 18th (Friday), the Pacific high pressure system in the eastern part of Japan is protruding into the west, covering the area around eastern Japan.
The Kanto-Koshin region, the Hokuriku region, and the southern part of Tohoku are covered by high pressure, and summer sky is spreading out.
As of 11:00, there are many places that are already midsummer day.
Temperatures will rise rapidly in the afternoon, and there will be some extremely hot days in the Kanto-Koshin region, Hokuriku region, and southern Tohoku region.
The estimated maximum temperature is 37 C in Toyama, which is also affected by the Fohn phenomenon, and it is expected that there will be some areas where the temperature will be exceeded.
Be careful of heat stroke.



#From the three-day holiday, measures will gradually be taken every day, both day and night.
For the next week, many sunny days are expected to be covered by the Pacific high pressure system in the Kanto, Koshin, and southern Tohoku.
There will be some places where the heat will continue day by day, whether it be a tropical night or a tropical night.
Please take thorough measures against heatstroke, such as drinking plenty of water and taking breaks.
Also, due to the effects of warming during the day and humid air, the atmosphere will become unstable, and there will be sudden heavy rain and thunderstorms, especially along the mountains and inland areas.
Even if the weather forecast continues to show clear signs, be careful of changes in the sky.

*The rainy season is a seasonal phenomenon, and on average there is a period of "change" of about five days after the start of the rainy season.
Please note that announcements regarding the start of the rainy season and the end of the rainy season are preliminary figures and may be reconsidered and reviewed taking into account the weather conditions from spring to summer.

Linear precipitation zones may occur in Nagasaki and Saga prefectures in northern Kyushu; wary of heavy rain disasters

2025/07/18 08:59

There is a high pressure system in the east of Japan, and it bulges out near Honshu. Active rain clouds are shining mainly in Chugoku, Shikoku and Kyushu due to the effects of the warm, humid air surrounding the high pressure.

As of 8:30am today, the 18th (Friday), heavy rain warnings (landslides) have been issued in Kagawa and Ehime prefectures in Shikoku, and flood warnings have been issued in Kagoshima prefecture. The developed rain clouds gradually move westward, and the rainy mountain passes are beginning to cross around Shikoku, but you should not let your guard down. In some areas where warnings have been issued, the ground has been loosened due to previous rain. Even if there is a slight rain, you need to be careful and be aware of landslides.

On the 18th, the Japan Meteorological Agency announced that linear precipitation zones will occur in Nagasaki and Saga prefectures from the afternoon until the beginning of the night, causing the risk of heavy rain disasters to increase dramatically.



The 24-hour rainfall expected by 6am tomorrow morning on the 19th is 180mm for most parts of northern Kyushu and 120mm for most parts of the south. In the Chugoku region, 24-hour rainfall of 80mm is expected in large numbers, so beware of landslides, low-lying flooding of land, rivers and flooding in these areas.
Please be careful not only for the latest weather information that will be updated in the future, but also for evacuation information announced by local governments.

Typhoon No. 6 "Whiper" occurs; beware of high waves with swells in the Nansei Islands

2025/07/18 07:29

A typhoon broke out near Tokai in the Philippines around 3am today, the 18th (Friday). This is the fourth typhoon that has occurred this month.

#Typhoon No. 6 - Friday the 18th, 6am
====
Center location: East
Moving speed of the Philippines: Northwest, 20km/h
Center pressure: 994hPa
Maximum wind speed: 18m/s (near the center)
Maximum instantaneous wind speed: 25m/s
===

Typhoon No. 6 is expected to take a westward course in the future and move away from around Japan. Although there is no direct impact on the area around Japan, the main island of Okinawa and the Sakishima Islands may be affected by the humid air from Typhoon No. 6, which could cause active rain clouds to be exposed. Be careful of intensifying rain and thunderstorms.


Also, swells from the typhoons are spreading, and waves are gradually rising above the seas around Okinawa main island and Sakishima Islands, making it expected to crash. The waves are expected to be 4 meters tall near the main island of Okinawa, and 5 meters near the Sakishima Islands by tomorrow, the 19th. Be careful of high waves with swells at sea and coastal areas.

The heat continues nationwide. Local heavy rains around Honshu are everywhere. Summary of weather and temperatures (July 6th - July 12th, 2025)

2025/07/18 06:55

Here is a summary of the weather during this period (July 6th to July 12th).

#Summary of weather for this period (July 6th to July 12th)
The average temperature was covered in warm air nationwide, and was almost 3 to 4 C higher than in all normal periods. Meanwhile, in Okinawa and Amami, the temperature trend was slightly below normal due to the effects of Typhoon No. 4 and the humid air, due to the fact that there were many cloudy and rainy days.

Pressure of precipitation tended to be quite low, especially on the Sea of Japan side of northern Japan and western Japan, where high pressure was likely to be covered. Meanwhile, in southern Kyushu, Okinawa and Amami regions, due to the effects of Typhoon No. 4 and the warm, humid air, there were many cloudy and rainy days, and the precipitation was about 2-3 times higher than normal.

Sunday hours were mostly sunny, mainly on the Sea of Japan side of northern Japan to western Japan, and many of the areas were more sunlight than usual. In the second half of the period, due to the rainy season front and the high pressure of the Sea of Okhotsk, the sunshine hours remained almost normal on the Tohoku Pacific side and Kanto region. Okinawa and Amami were cloudy and rainy days, and the days remained below normal sunshine hours.



#Characteristics of atmospheric pressure layout
On the 6th, Typhoon No. 3 traveled northeasterly over Japan's Tokai region. High pressure is almost stagnant in Japan's southern seas. Typhoon No. 4 has developed into a strong force near the Taiwan Strait. On the 7th, Typhoon No. 3 headed north over Japan's Tokai region. The area around Honshu was covered with high pressure, centered around the Korean Peninsula. Typhoon No. 4 heads north over the East China Sea. On the 8th, Typhoon No. 3 became a temperate cyclone in the east of Japan, and later became integrated with the front in the east of Japan. Typhoon No. 4 changed its course from north to west in the East China Sea. On the 9th, a rainy season front formed around Tohoku, and slowly moved south. Typhoon No. 4 has been transformed into a tropical cyclone. On the 10th, the rainy season front continued to move south from Tohoku to Kanto, and the Sea of Okhotsk high pressure system moved southeast to the north of the front. On the 11th, the rainy season front traveled south to the Izu Islands, and a low pressure system occurred on the front at 9am. A tropical cyclone occurs in the waters near Ogasawara, and in the East China Sea, the low-pressure areas become tropical cyclones. On the 12th, a tropical cyclone almost stagnated near Ogasawara. The tropical cyclone in the East China Sea gradually changed course towards the east towards the night.

#Precture
On the 6th, heavy rain of 39.5mm/h was observed in Nago City, Okinawa Prefecture due to the effects of warm and humid air from Typhoon No. 4. On the 7th, heavy rain was observed on Miyakojima, Sakishima Islands, due to the effects of warm and humid air around Typhoon No. 4. On the 8th, the atmosphere conditions became unstable in western Japan due to rising daytime temperatures and warm, humid air. A fierce rain recorded 93.0mm/h in Mita City, Hyogo Prefecture. Heavy rain was released in Hiroshima and Shimane prefectures, with record-breaking short-term heavy rain information. On the 9th, local thunderstorms were affected by fronts and humid air in the Tohoku region from the Kanto-Koshin region. Very heavy rain at 79.5mm/h was observed in Kinamiri, Nagano City, Nagano Prefecture. On the 10th, there was a heavy rain locally due to the influence of the humid air heading towards the front. On this day, a total of 31 record-breaking heavy rains were announced in the southern Tohoku region, Kanto, Koshin, and Tokai region. On the 11th, due to the cold and humid air above, the rains were extremely heavy on the Kii Peninsula and Kyushu, and 59.0mm/h was observed in Shingu City, Wakayama Prefecture. On the 12th, extremely heavy rain of 58.0mm/h was observed in Nobeoka City, Miyazaki Prefecture due to the effects of warm, damp southeastern winds.

#Temperature
On the 6th, the heat was severe nationwide, and it was a hot day of 38.3c in Kuwana City, Mie Prefecture. In Kyoto City, the temperature reached 36.3 degrees Celsius, marking the eighth consecutive day of extreme heat. On the 7th, the number of midsummer days reached 778 points, marking the highest number of this year. The temperature was 35.6 C in central Tokyo, marking the first extremely hot day of the year. On the 8th, the temperature reached 35.8 degrees Celsius in central Tokyo, marking the second consecutive day of extreme heat. On the 9th, the heat was severe, especially in western Japan. It's a hot day with a temperature of 38.4c in Asakura City, Fukuoka Prefecture and 38.0c in Hita City, Oita Prefecture. On the 10th, the sun was exposed to the Kanto and Kyushu, and it was on extremely hot days in various places. For the sixth day in a row, the number of hot spots exceeded 100. On the 11th, the heat eased from the Tohoku Pacific side in the Kanto region due to the effects of the cool air from the high pressure of the Sea of Okhotsk. The highest temperature in central Tokyo was 25.1c, similar to the end of May. Meanwhile, the heat in western Japan and the Nansei Islands was severe, with Osaka on a hot day of 36.7 C. On the 12th, the heat continued to ease from the Tohoku Pacific side to the Kanto region, and the heat continued to be severe in the regions from the Tokai to the West. In Kurume City, Fukuoka Prefecture, it recorded a hot day of 36.6 C.

Latest month forecast: The severe heat continues, and water shortages in Honshu are worried

2025/07/17 22:14

On Thursday, the Japan Meteorological Agency announced its latest monthly forecast, which will provide an estimate of the weather for the next month.



According to the forecast results of the numerical forecast, the monthly average sea level pressure is higher than normal in the area around Honshu, and in some times in the north, east and western Japan, there are times when it is likely to be covered by Pacific high pressure.
On the other hand, sea level pressure is predicted to be lower than normal in the area around the East China Sea, and it is predicted that there will be times when Okinawa and Amami are susceptible to tropical disturbances and humid air.
The temperature around 1500m above the sky is projected to be higher than normal, mainly in northern Japan.



For the next month, there will be many sunny days in North, East and Western Japan, and temperatures will be significantly higher than normal from Hokkaido to Kyushu. The heat will continue nationwide and we expect the number of days to become extremely hot, so please take full precautions against heatstroke. It is also likely that tropical nights continue even at night when the temperature is above 25 C. Take measures against night heat stroke by running the air conditioner all day and night.
Although there are many sunny days on the eastern and western Japan Pacific sides, precipitation is expected to be on average or less than normal. There is a risk of water shortages or droughts, so make sure to save water and use water resources with cherished care.


On the other hand, Okinawa and Amami are susceptible to humid air, and precipitation will be as high as normal or higher than normal. This is a period when tropical cyclones and typhoons are prone to occurrence, and tropical cyclones and typhoons may approach them. You need to be careful of the latest weather information ahead.

"Heavy rain and super hot weather" - Kanto, Koshin will end tomorrow - dangerous heat begins [Weekly weather across the country]

2025/07/17 12:59

Today, the 17th (Thursday), warm and humid air will flow from the south around the edge of the Pacific High Pressure, and the atmosphere conditions are extremely unstable in the Shikoku and Tokai regions.



Tonight, heavy rain with localized lightning and extremely heavy rain will likely fall on the Pacific side of western Japan, and the Japan Meteorological Agency has announced that linear precipitation zones may occur in Kochi and Tokushima prefectures late at night today, Thursday the 17th.



In the Shikoku region, where linear precipitation is expected, rain is likely to peak at some point when it is dark.

Evacuation is dangerous after heavy rain begins.
Please make sure to move to a safe place in the bright place.


After this heavy rain, the high pressure centered in the east of Japan will strengthen its strength to the west, bringing about sunny weather and fierce heat.





In eastern Japan, including Kanto, it will be
/weather sunny from tomorrow, the 18th (Friday), and the heat is expected to continue throughout the three-day holiday.


As soon as soon as the 18th (Friday), there may be an announcement that the rainy season will end in the Kanto-Koshin region.
(Ordinary rainy season ends in the Kanto-Koshin region: around July 19th)

Temperatures in the west to eastern Japan will rise to around 35 C every day from next week, and the heat is expected to continue.

Children will be in the summer vacation, but
Please be careful of heat stroke.


When going out to enjoy mountain or river leisure activities during summer vacation
Be careful of sudden changes in the weather and check the surrounding area using rain cloud radar.


On the other hand, in Hokkaido, it is expected that rain clouds associated with the
front continue to hit similar areas from Saturday the 19th to Sunday the 20th.


There is a possibility of heavy rainfall of the warning level, especially on the Sea of Japan side of Hokkaido, so please continue to check the latest information.

[Predicting the occurrence of linear precipitation zone] Kochi and Tokushima: There is a risk of linear precipitation zones occurring during dark times; how to protect yourself from torrential rain

2025/07/17 11:36

Warm, humid air flows from the south around the edge of the Pacific High Pressure
In the Shikoku and Tokai regions, the atmosphere is extremely unstable.



The Japan Meteorological Agency announced today, Thursday, the 17th, "
linear precipitation zones may occur in Kochi and Tokushima prefectures from the afternoon until late at night, causing the risk of heavy rain disasters to rise rapidly."



Tonight, heavy rain with localized lightning and extremely heavy rain are expected to fall on the Pacific side of Western Japan.

In particular, in the Shikoku region, active rain clouds continue to appear in a row, causing a large amount of rain.

[Expected rainfall (24 hours a day, with high rainfall)]
Until 6am tomorrow, the 18th (Friday)
Setou Inland 100mm
Pacific side 250mm
Tomorrow, Friday the 18th (6am) to 6am (Saturday the 19th (br)
Setou Inland 50mm
Pacific side 80mm

If rain clouds develop more or stagnate than expected, or if they stagnate, there is a possibility that heavy rain at the warning level.


Please be careful of low-level land flooding, flooding of rivers, and landslides.
Also be careful of severe gusts of wind, such as lightning strikes and tornadoes.



In the Shikoku region, where linear precipitation is expected,
It is likely that rain will reach its peak after dark times.

Evacuation is dangerous after heavy rain begins.
Please try to evacuate to a safe place while in a bright, bright place.

Do not go and see the river or rice fields, and
When sleeping, please rest in a room on the second floor or above, far from the cliffs or slopes.



In Shikoku, the rain will gradually stop from tomorrow afternoon, but
In Kochi, due to the influence of humid air, it will likely rain until around Sunday the 20th.

Eastern and western Japan are likely to cause heavy rain, warning-level rain, and be careful of landslides and lowland flooding.

2025/07/17 06:29

A high pressure system centered on the far east of Japan is spreading out near Japan, and warm, humid air flows from the south along the edge of the high pressure system, making the atmosphere extremely unstable, mainly on the Pacific side of eastern Japan and western Japan, with some areas suffering from heavy rain and extremely heavy rain. As of 6:00am, heavy rain warnings have been issued in Gifu, Mie, and Wakayama prefectures, and landslide warning information has been issued in Mie prefecture.



Continuing, in eastern Japan, active rain clouds will likely pass through, mainly on the Pacific side, up to tomorrow, the 18th in western Japan, and there will be some areas where heavy rain will occur, with heavy rain accompanied by thunder and very heavy rain.

[Rain forecast]
#Expected rainfall (at high places)
+24-hour precipitation expected by the dawn of the day of the 18th
/B: Kanto-Koshin region: 100mm

: Tokai region: 200mm
: Kinki region: 180mm


/B: 250mm


/B: Disaster prevention matters]
: In eastern Japan, today, the 17th, we need to be very careful of landslides and be careful of low land flooding, river flooding and flooding. In western Japan, please be careful and be careful of landslides, flooding of low landslides, and rising rivers tomorrow, by the 18th. Also be careful of severe gusts of wind, such as lightning strikes and tornadoes. If there are signs of developing cumulonimbus clouds approaching, try to ensure your safety by moving inside the building. There is a risk of falling hail, so be careful when managing agricultural crops and agricultural facilities.

Weather for today, Thursday the 17th: Rain clouds go from east to west; Pacific side is wary of heavy rain disasters

2025/07/17 05:55

Today, the 17th (Thursday), the Pacific High Pressure is expected to rise near Japan. Moist air around the edge of the high pressure will flow into Tokai to western Japan.



In northern Japan, clouds tend to spread out and it's probably not clear. There is a possibility of rain, so it's safe to have a folding umbrella when you go out. The sun is scarce, but the temperature is high and it looks like it will be hot and humid.


There will be some rain in the Kanto region until the morning, but the weather will likely improve in the afternoon. It seems there will be some areas where the sun will reach the afternoon. When you leave, be careful not to forget to put rain gear.


The rain will be wider from Tokai to west, making it a day where umbrellas can be used in a wide range. Rain clouds tend to develop mainly on the Pacific Ocean, and there is a risk of extremely heavy rain over 50mm per hour. Beware of landslides, flooding of low land, flooding of rivers and flooding.
When going out in Chugoku, Shikoku, Kyushu, etc., even in places where it's not raining, please bring a large umbrella when going out.
In western Japan, it gets hot and humid during the day, so you need to be careful of heat stroke.

[Summary of the Ocean] Sea surface temperature in the Sea of Japan is much higher than normal, and some areas were hit by the effects of Typhoons No. 3 and No. 4.

2025/07/16 15:15

The sea surface temperature of the Sea of Japan is widely used in waters that are much higher than normal. The temperature was 6 C higher than normal.
Also, there were some places that were able to survive due to the effects of Typhoons No. 3 and No. 4.

Summary of the Ocean (July 6th-12th, 2025)



#Pressure configuration and waves
On the 6th-8th, Typhoon No. 3 headed northeasterly in Japan, transforming into a temperate cyclone at 9am on the 8th.
The waves rose around Typhoon No. 3, and the area near the center of Typhoon No. 3 has broken.
Also, Typhoon No. 4 traveled through the South China Sea and the Taiwan Strait and into the East China Sea.
The wave height has been set to a height of over 4m in the waters near the Sakishima Islands and the East China Sea.
On the 9th, Typhoon No. 4 transformed into a tropical cyclone in southern China, and the waves in the waters near Japan gradually began to move calmly.
From the 11th to the 12th, the low-pressure parts of the East China Sea became a tropical cyclone at 9pm on the 11th, moving northwest through the East China Sea.
Another tropical cyclone headed north through the waters near Ogasawara.
The front extends to the east of Japan, and a cyclone on the front moved northeast.
Waves have risen in the East China Sea, the seas near Ogasawara, and the east of Japan.



#Sea surface temperature
The sea surface temperature in the Japanese Sea continues to be widely and significantly higher than normal, with a maximum of 6 C higher on the central continent side.
There was a fairly high seas in the west of Kyushu as well.
On the other hand, the sea area around the Sakishima Islands gradually expanded to an average age due to the effects of Typhoon No. 4 moving north.
On the Pacific side, it was higher than normal from Cape Ashizuri to Cape Shio, where the Kuroshio Current docks, and significantly higher than normal from Cape Ashizuri to Cape Sanriku, near the Boso Peninsula to off the coast of Sanriku.
The temperature off Sanriku is up to 6 C higher than normal.
The waters around Hokkaido continued to be quite high.
The waters near the Kuril Islands are on par with normal years.