Summary of weather and temperature (April 27th to May 3rd, 2025) Snowfall in Hokkaido at the end of April; more rainfall on the Pacific side of the eastern Japan than usual

2025/05/09 06:31

This is a summary of the weather during this period (April 27th to May 3rd).

#Summary of weather for this period (April 27th to May 3rd)
The average temperature is lower than normal, especially in Hokkaido, which was affected by low pressure and strong cold air above, and in the Tokachi region, there were some places that were nearly 3 C lower than normal. Many of the temperatures between Tohoku and Kyushu remained at almost normal levels.

Precture increased in Hokkaido due to the effects of strong cold and low pressure in the sky, and in Sapporo and Kushiro it was about 2 to 3.5 times higher than normal. On the Pacific side of the eastern Japan, total rainfall increased as it was susceptible to low pressure, fronts and humid air. The amount of rainfall in the Kanto and Tokai regions has been higher than normal, and in Maebashi and Tokyo it has been about 2.8 to 3.8 times the average.

Sunday hours were small, especially in northern Japan, where it was easily affected by low pressure. There were many days when high pressure was covered in western and eastern Japan, and there was more sunlight than usual, especially in Kyushu and the Nansei Islands.



#Characteristics of atmospheric pressure arrangement
On the 27th, a low pressure system moved southeasterly around the northeastern district of China, and a mobile high pressure system moved eastwardly over Japan's southern seas. The front line has become apparent near South China. On the 28th, a low pressure system on the front developed, moving eastward from the East China Sea along the southern coast of Honshu. On the 29th, a low pressure system accompanied by a front proceeded northeast from the Kanto sea towards Sanriku off the coast of the country. High pressures travel eastward through the East China Sea from China. On the 30th, the low pressure system in the waters near the Kuril Island gradually moved away from near Japan, and the area around Honshu was covered with a mobile high pressure system. On the 1st, the mobile high pressure system gradually moved away from Japan's East Sea, and a low pressure system began moving eastward from near the Korean Peninsula. A new low-pressure occurred in the west of Kyushu around 9pm. On the 2nd, a low pressure system moved northeasterly through the Sea of Japan. Another low pressure system is moving eastward along the southern coast of Honshu. A new low pressure system with a front formed over the southern seas of Japan, moving eastward. On the 3rd, a low pressure system moved northeasterly over Japan's East Sea, and the front gradually separated from the low pressure system. Another low pressure system drove eastward into the Yellow Sea, and at around 9am it passed near the Korean Peninsula with a front line and headed towards the Sea of Japan.

#Precture
On the 27th, rain mainly in the Nansei Islands due to the influence of humid air on the high pressure margin and fronts. Heavy rain of 32.0mm/h was observed on Miyakojima. On the 28th, rain and thunderstorms occurred mainly in western and eastern Japan due to the effects of low pressures and fronts traveling along the southern coast of Honshu. On the 29th, due to the strong cold air above and the developed low pressure system, the snow was wet in Hokkaido, and some areas were covered in snow on flat land. Snowfall of 18cm 24 hours a day on the shores of Lake Akan, Kushiro, Hokkaido, and snowfall of 16cm 24 hours a day in Obihiro. On the 30th, snow fell in Hokkaido in the early hours and rained on the Sea of Japan side until dawn. On the 1st, rain began to rain in southern Kyushu and Okinawa due to the influence of humid air on the high pressure margins. Heavy rain at 39.0mm/h in Kaseda, Minamisatsuma City, Kagoshima Prefecture. On the 2nd, rain in western and eastern Japan was intensified due to the effects of low pressure and fronts. In Shingu City, Wakayama Prefecture and Katori City, Chiba Prefecture, extremely heavy rain of 51.0mm/h was observed, and heavy rain warnings (flood damage) and flood warnings were issued in the Kanto, Tokai and Kinki regions. On the 3rd, rain began to rain on the Pacific Ocean side of Northern Japan until dawn due to the effects of a low pressure system. From the evening onwards, due to the influence of the front, rain began mainly on the Sea of Japan side of western Japan and eastern Japan.

#Temperature
On the 27th, the temperature rose gently from Tohoku to Kyushu. A summer day of 28.8c in Hita City, Oita Prefecture. In Sapporo, the cherry blossom development schedule is being held 9 days earlier than usual. On the 28th, there were many cloudy and rainy areas, and the temperatures did not rise much nationwide due to the lack of sunlight. On the 29th, due to strong cold weather, the temperature in Hokkaido was about March. The daily maximum temperature in Nukabira Gensenkyo, Tokachi region, is 0.9 C, and this is the first time in 19 years since April 24th, 2006 that the highest temperature has reached the 0 C level in April. On the 30th, the temperatures began to clear in western and eastern Japan. It recorded a summer day of 27.8c in Dazaifu City, Fukuoka Prefecture. On the 1st, temperatures rose on the Sea of Japan side due to the influence of the Fohn phenomenon. Summer days on the Sea of Japan side, with 29.6c at Sakaiminato City, Tottori Prefecture and 29.4c at Koide, Uonuma City, Niigata Prefecture. On the 2nd, temperatures did not rise in Kanto and Tokai, where there was little sunlight due to rain, and the highest temperature in central Tokyo was 18.7c, similar to mid-term. Meanwhile, in Hirosaki City, Aomori Prefecture, the temperature rose to 25.3 C due to the influence of the Fohn phenomenon. On the 3rd, temperatures rose in western and eastern Japan. In Fukuoka, it was 26.3c, which was the first summer day in six days. A full cherry blossom development chart in Obihiro and Muroran.

Latest month forecast: It will be hot and humid after mid-May, with high precipitation expected in Kanto and Tokai

2025/05/08 21:12

Today, the 8th (Thursday), the Japan Meteorological Agency announced the latest one-month forecast, which will provide an estimate of the weather for the next month.



The average monthly sea level pressure over the next month is high in the south of Japan, and it is expected that there will be a time when high pressure overhangs will become stronger over the southeastern sea of Japan. Also, around 1500m above the sky, the area around Japan is likely to be covered in warm air, and it is expected to be higher than normal over a wide area.

Due to these effects, average temperatures around Honshu will be higher than normal throughout the period. In particular, from the 14th onwards, the Japan Meteorological Agency has released an "early weather information on high temperatures" nationwide, claiming that there is a risk of high temperatures reaching once every 10 years.



Also, due to the humid air surrounding the high pressure system in the southeastern Sea of Japan, there will be more rainy days, mainly in areas on the Pacific Ocean side of the East Japan coast, such as the Kanto and Tokai, and the precipitation will be higher than normal. The Sea of Japan side of western Japan and eastern Japan is likely to have precipitation as normal or higher than normal. The weather changes in northern Japan every few days, and precipitation is expected to be on par with normal years.



In western and eastern Japan, sunny days will likely be midsummer days above 30 C. Even in northern Japan, there are likely days when summer days are above 25 C. It is expected that the number of "huge and humid" days will increase from mid-May, mainly in western and eastern Japan. Not only should you take measures against heat stroke, but you should also be careful about food management.


It will rain more easily in Okinawa and Amami, just like in normal years. The average year in Okinawa's rainy season begins is around May 10th, and in Amami it is around May 12th. The rainy season is nearing the start of the season, so please take measures against heavy rain early.

[Sea surface temperature] The coast of Hokkaido is still over 3 C higher than normal. Summary of the ocean (April 27 - May 3, 2025)

2025/05/08 13:57

The temperatures off the coast of Hokkaido are still over 3 C higher than normal.
Below is a summary of the oceans (April 27th to May 3rd, 2025)



#Attitude configuration and waves
28 On the day, the pressure slope became larger between the high pressure far east of Japan and the low pressure south of the Aleutians, and waves rose higher in the east of Japan.
From the 29th to 30th, a low pressure in the Sea of Japan moved eastward, and a low pressure in the eastern Japan developed along with a front, leading to the waters near the Kuril Islands.
Waves rose in the low pressure system and around the front, and on the 29th there were some areas in the middle and northern parts of Japan and east of Japan.
30 On the day, waves rose in the eastern part of Japan to the Sea of Okhotsk, and it hit the sea near the Kuril Islands.
On the 3rd, a low pressure system moved northeasterly in Japan, and another low pressure system moved northeasterly in the Primcoes state.
The pressure slope increased between the high pressure system and the eastern Kuril Islands, and waves increased in the eastern part of Japan and the Sea of Okhotsk.



#Sea surface temperature
The sea surface temperature in the Japanese Sea is slightly higher than normal on the northern and central continental side, and in other areas it continues to be in the same or slightly lower than normal.
The waters near the East China Sea and the Southwestern Islands are almost normal.
The Pacific side continues to be lower than normal, mainly off the coast of Shikoku, where the Kuroshio Current is ripped.
In the east of Kanto, which is a continuous trend in the Kuroshio Current, it continued to be higher than normal.
The off Sanriku area was lower than normal, with a maximum temperature of 3 C lower.
On the other hand, the area off the coast of Hokkaido was higher than normal, with a maximum temperature of 3 C higher.
The Sea of Okhotsk to the Kuril Islands remained almost normal.

Tomorrow to Saturday, 10th (Saturday) Warning level heavy rain and storms will affect transportation; next week, "quite high temperatures" will suddenly become hot [Weekly weather]

2025/05/08 12:35

Today, the 8th (Thursday), the area around Honshu is covered in high pressure, and it is a gentle sunny day.
The air is dry and the fresh and sunny atmosphere is typical of early summer.

This mild weather will not last long, and the weather and temperature will likely change significantly over the next week.

#Top of the weather ahead#
+Tomorrow (Fri) - 10th (Sat) - Rising of heavy rain and storms
+Saturday - 10th (Sat) - 11th (Sun) - Yellow sand attacks again
+Around the 13th (Tue) - "very high temperatures" nationwide
+Okinawa and Amami are approaching the "rainy season" in the future



#Tomorrow (Friday) - Saturday the 10th - Risk of heavy rain and storms on alert#

If tomorrow (Friday) the high pressure system will move away to the east of Japan, and a low pressure system accompanied by the front is expected to develop from the Yellow Sea to the Korean Peninsula.


Further rain clouds will also flow from the south towards the low pressure and the front
/warm, humid air will flow, and
Tomorrow (Friday) will cause the rain to increase from the west.

Rain will increase in western Japan tomorrow afternoon, and in the Kyushu region, there will be some areas that will fall violently from the evening in Shikoku, Chugoku and Kinki regions, and in the Shikoku, Chugoku and Kinki regions, at night, with thunder.


It is likely that on the Sea of Japan side of western Japan, southwest winds will be intensified from around noon tomorrow
/It is likely that a storm warning will be issued.

In West Japan, there is a possibility that it will affect transportation such as airplanes, so please be careful of the latest weather and traffic information.

When Saturday the 10th, the center of the active rain clouds is expected to move to Eastern Japan and Northern Japan.


There is a risk of heavy rain on the warning level in the Kanto and the Pacific Ocean side of the Tokai region.
It would be a good idea to clean the gutters and other parts by tomorrow (Friday) in preparation for heavy rain on the weekend.



#The 10th (Sat) to the 11th (Sun): "Yellow sand" attacks Western Japan again#

We are expected to see yellow sand flying again after the rain.

For now, yellow sand is expected to fly from western Japan on the 10th (Sat), mainly in western Japan, and
11th (Sun), mainly in western Japan to eastern Japan.

/Please be careful not to get dirty with your car or laundry.




#From around Tuesday the 13th, "a considerable high temperature" nationwide#

This week was often covered in the comfortable early summer air, but
Next week is likely to suddenly switch to the crunchy summer air.

The center of high pressure is expected to live in the east of Japan, and
It is likely that warm, humid air will flow into the south at a regular rate.

For this reason, "quite high temperatures" are expected nationwide next week, and from Wednesday the 14th to Thursday the 15th, the temperature is expected to be 26 C in Obihiro, Hokkaido.
In Honshu, the temperature rises to around 30 degrees Celsius, and it is likely to be a week in which the temperature will continue to be in the midsummer.

We are not yet used to the heat, so
Please stay hydrated frequently.



#Okinawa and Amami are approaching the start of the rainy season#

From now on, fronts will likely stagnate near Okinawa and the Amami region.
The rainy season begins in the average year on May 10th in the Okinawa region, and
The rainy season is on May 12th in the Amami region.

Rain is expected to start in the Okinawa region from around the 10th, and this year it is likely that the rainy season will begin as usual.

Today, the 8th (Thursday), the weather will be mildly sunny, but from Friday, the 9th (Friday) to Saturday, the 10th (10th) there will be heavy rain and winds of warning level.

2025/05/08 09:39

To the east of the Kuril Island is a low pressure system that moves northeasterly, with the front extending from the center passing through the east and southern seas of Japan, and south of Okinawa and reaching south China.
On the other hand, there is a high pressure system near Honshu and is moving east.

Currently, clouds are spreading in Kanto and Okinawa, but other areas are widely sunny.
Today, the area will be covered in high pressure, and the weather will be gentle over a wide area from Kyushu to Tohoku.


The atmosphere conditions in Hokkaido are unstable.
Please note that in some cases, it may cause lightning to occur.
In the Okinawa region, it will be cloudy and rainy due to the influence of the front.


There are some summer days between Tokai and Kyushu where the highest temperatures are 25 degrees or higher, but the humidity is low and many places are comfortable and lively.



However, tomorrow, the 9th (Friday), if a low pressure system develops, it will move northeasterly through the Sea of Japan, and the front extending from the low pressure system will pass through Honshu on the 10th (Saturday).
As warm, humid air flows towards the low pressure and the front, there is a risk of heavy warning-level rain with lightning from the 9th (Friday) to the 10th (Saturday).
Also, the high pressure and pressure slopes over the East Sea will be large, and extremely strong winds will blow, and waves will rise along the sea, and there are some areas where you can get some scorching at sea.






Beware of landslides, low-ground flooding, river flooding, and on the 10th in the East to Northern Japan and the Nansei Islands, beware of landslides, low-ground flooding, and river flooding, and beware of severe gusts such as lightning strikes, gusts of winds, locally tornadoes.
Also, be careful of strong winds and high waves in the Nansei Islands on the 9th, in the west to east Japan on the 9th, in the 10th, and in the 10th, in the north Japan on the 10th.
There are likely some areas that will affect transportation, so please be careful of future weather information.

Warning-level heavy rain and storms may occur on weekends; beware of "severe high temperatures" next week [Weekly Weather]

2025/05/07 12:34

Yesterday, the last day of the holiday, the low pressure system that caused extensive rain
Today, the 7th (Wednesday), is moving northeasterly, developing off the coast of Sanriku.


There are some places in northern Japan, and in Hokkaido, there will be some places where rain and thunderstorms will continue until tonight.

/BOn the other hand, the west and eastern Japan are mildly sunny, with early summer breezes.
However, there are some places where yellow sand is flying in, so please be careful not to stick to cars and laundry.


If tomorrow (Thursday), the weather will improve in northern Japan, and
We are expected to see sunny all over the country.
Temperatures will also rise, and tomorrow's daytime
Could be around 20 C in northern Japan and around 25 C in western to eastern Japan.



When the 9th (Friday), if the low pressure system develops, it will move northeasterly through the Sea of Japan, and the front extending from the low pressure system will pass through Honshu on the 10th (Saturday).

Due to warm, humid air flowing towards the low pressure and the front, warning-level heavy rain could occur on the Pacific Ocean side of the West to East Japan from the 9th (Friday) to the 10th (Saturday).


In addition, there are likely places where storms blow in western Japan.


Please be careful of the latest weather information as there may be some areas that may affect transportation when you go out on weekends.




After the rain this weekend, warm air will flow into it
It looks like the heat will suddenly increase.


According to the "Early Weather Information on High Temperatures" released by the Japan Meteorological Agency the other day, "quite high temperatures" are expected from around May 13th, Kyushu to Hokkaido will be "high temperatures" at this time of year.




If we look at the expected highest temperatures for the future,
Could the temperatures exceed normal next week in various places,
Can rise to around 30 C during the day, with many midsummer days likely to occur.

We are not used to the real heat yet, so please hydrate frequently, exercise lightly and sweat again
/Read it early to get used to the heat.

The weekends are over a wide area, and the wind is strong, so there is a risk of rough weather.

2025/05/07 07:48

Today, the 7th (Wednesday), the sun will reach the area, mainly in western Japan, and it is expected to be a gentle and cheerful atmosphere.
Tomorrow, the 8th (Thursday) will be even more sunny and sunny, and it looks like it will be a sunny day across the country. However, the weather is expected to fall nationwide from Friday the 9th to Saturday the 10th, as low pressure and fronts approach. Make effective use of the sunlight.




On Friday the 9th, low pressure and fronts are expected to approach from the west, and on Saturday the 10th, a low pressure system is expected to move northeasterly through the Sea of Japan. The weather will likely be disrupted mainly in western Japan on Friday the 9th, and the weather will be disrupted mainly in eastern and northern Japan on Saturday the 10th.
As warm, humid air flows towards the low pressure and the front, the rain will become stronger, mainly on the Pacific side of western Japan to eastern Japan, causing heavy rain to fall by over 30mm per hour, leading to heavy rain. Be careful of landslides, flooding of low land, lightning, gusts of wind, and tornadoes.


Also, as the low pressure system develops, the wind is expected to be stronger, especially around the coastal areas, as the Sea of Japan progresses. As this could affect transportation, if you are planning to go out on weekends, please be careful of the latest weather and traffic information.

Weather today, Wednesday the 7th: There will be some rainy areas in northern Japan until the morning; western Japan will be spreading blue sky

2025/05/07 06:20

Today, the 7th (Wednesday), the low pressure system that caused rain over a wide area yesterday is expected to move away east, and high pressure system from the west.



On the Pacific side of North Japan, rain will likely fall, especially in the morning due to low pressure. The weather is heading for better weather in the afternoon, and it seems that some areas in Tohoku are reaching the sun. Meanwhile, on the Sea of Japan side of Hokkaido, the sun is sunny and exposed, making it a comfortable experience during the day.


There is occasional sunlight in the Kanto region, but the sky is likely to be dominated by clouds. There is a possibility of local showers, so it's safe to have a folding umbrella.


Tokai, Hokuriku, and western Japan will be covered by high pressure, and blue sky will spread over a wide area. The temperature will rise during the day than yesterday, making it a comfortable experience. Please be careful when managing your health as the temperature difference between the mornings and evenings will become larger.


The sky pattern in Okinawa is full of clouds and is not clear. This will be a day when rain gear will be useful, mainly in the Sakishima Islands.

Be careful of "yellow sand" after the rain! Next week, "quite high temperatures" suddenly become the summer heat [Weekly Weather/Early Weather Information]

2025/05/06 12:37

Today, the last day of the holiday, the 6th (Tuesday), a low pressure system accompanied by the
front is moving east along the southern coast of Honshu.

It is widely raining in the west to eastern Japan, and on the Pacific side, the rain is getting stronger.
There are also some places in Okinawa and the Sakishima Islands that have caused thunderstorms due to rain.

The low pressure system will move away to the east of Kanto tonight, but
Cold air flows into the sky above, so the atmosphere is expected to remain unstable.

There will be some areas where rain will remain in northern Japan until around noon, but
In the west and eastern Japan, the weather will improve during the day and the weather will be sunny.



However, it is expected that "yellow sand" will fly widely after the rain.



Even as of noon today, when looking at the weather satellite Sunflower from the sky, there is a yellowish yellowish area behind the clouds associated with the lying
/¢Yellow sand".


After this, yellow sand is expected to fly to Japan as it hits the wind above.



If you look at the predictions for yellow sand for the next day, Wednesday the 7th, it is shown in brown and is expected to fly widely from Okinawa to Hokkaido.

Yellow sand will fly in western Japan tomorrow, the 8th (Thursday), and
Yellow sand may fly in northern Japan again on Friday, the 9th (Friday).


You may want to hang out your laundry after the rain tomorrow, but
Please be careful not to get dirty with your laundry.



#From next week, the summer heat will suddenly begin to hit the heat#

From now on, the 8th (Thursday) will be covered in high pressure and become widely sunny, but from Friday the 9th to Saturday the 10th (9th) a low pressure system will pass through the area around Japan

Heady rains in west to eastern Japan, mainly on the Pacific side.


Even if the temperature rises for the rest of this week, it can be said to be early summer at around 25 C, but
Next week, the Pacific High Pressure forces will strengthen in the summer, so
We are expected to see summer heat nationwide.



Information on early weather information on high temperatures released by the Japan Meteorological Agency yesterday,
It is expected that Kyushu to Hokkaido will be "severely high temperatures" from around May 13th
This period can be high once every 10 years.


Could temperatures rise to around 30 degrees during the day, with many midsummer days being released.

We are not used to the real heat yet, so
Please exercise lightly and sweat to get used to the heat early.

In western Japan, be careful of yellow sand from tonight (6th) to the 8th.

2025/05/06 07:35

From tonight to the 8th, you will need to be careful of yellow sand in western Japan.

/It is expected that yellow sand will fly to southern Kyushu and Amami regions from the beginning of the evening of the 6th.
Also, the effects of yellow sand will spread in southern Kyushu as well as in the Chugoku and Shikoku regions on the 7th, and yellow sand is expected to fly to the Kyushu region, Chugoku and Shikoku regions on the 8th.

Please note that due to the arrival of yellow sand, visibility is expected to be less than 10 km, and
Please note that this may affect traffic.


/If you are suffering from effects such as yellow sand sticking outside or respiratory illnesses, your symptoms may worsen. Please be careful to wear a mask.