Weather forecast for today, the 2nd (Wednesday): Northern Tohoku is on high alert for heavy rain disasters; western and eastern Japan also beware of localized thunderstorms

2026/09/02 07:08

Today, the 2nd (Wednesday), a low pressure system above the autumn rain front is moving through the Sea of Japan. Typhoon No. 24 is stationary in the south of Japan, and another typhoon No. 18 is in the South China Sea, sending warm, humid air toward the autumn rain front.



In the early hours of today, a linear rain band occurred in Aomori Prefecture, and heavy rain of more than 80 mm per hour was reported, and a series of meteorological and disaster prevention bulletins (record-breaking heavy rain in a short period of time) were announced. In Aomori Prefecture, there are areas where level 4 heavy rain danger warnings and landslide danger warnings have been announced.
Also, there are places in Akita Prefecture where heavy rain was observed, and a level 4 landslide warning has been announced in Fujisato Town, Akita Prefecture.

In the northern Tohoku region, there will be places where there will be heavy to very heavy rain, especially in the morning. Please be extremely cautious of landslides, flooding of low-lying areas, and rising and flooding rivers in Aomori and Akita prefectures.



From southern Tohoku to Kyushu, atmospheric conditions are unstable even in sunny areas. There is a high probability of lightning occurring over a wide area, and from the afternoon onwards there will be localized thunderstorms, mainly in inland and mountainous areas, and heavy rain is likely to occur in some places. Pay attention to changes in the sky.

In Okinawa, even areas with sunny spells will gradually experience rain, with localized thunderstorms. Also, please be careful of high waves and strong winds caused by Typhoon No. 24.



Due to the influence of warm and humid air from Tohoku to Kyushu, there are many places where the temperature is over 30c during the day, and there are likely to be places in the Kanto region where the temperature will be significantly higher than the day before. In western Japan, in areas where southerly winds flow over the mountains, temperatures can easily exceed 35 degrees Celsius, and the lingering heat will be severe. Please be careful about heat stroke.

There is a risk of heavy rain in northern Japan from tonight until the 3rd day after tomorrow due to the influence of a low pressure system.

2026/09/01 19:15

Today, the 1st (Tuesday), a low pressure system with a front in the central Japan Sea is moving east-northeast. This low pressure system is expected to move toward Hokkaido into tomorrow, the 2nd (Wednesday).

In Hokkaido, which is close to a low-pressure area, there will be places where heavy rain will be accompanied by thunder. Depending on the degree of rain cloud development, there is a risk of heavy rain reaching warning level, so please be careful.

Also, due to the influence of warm, humid air flowing toward fronts and low pressure systems and cold air in the upper atmosphere, there will be places in the Tohoku and Hokuriku regions where heavy rain will be accompanied by thunder.
In the Hokuriku region, the ground is loose in some places due to the rain that has fallen so far. Even low rainfall increases the risk of landslides, so please avoid approaching dangerous areas such as cliffs.





In the Hokkaido region, a low-pressure system accompanied by a front is expected to move into the area into next Wednesday, the 2nd. In the southern part of Hokkaido on the Sea of Japan side and the western part of the Pacific Ocean side, heavy rain accompanied by thunder will fall in some places from late Tuesday night on the 1st today until noon on Wednesday the 2nd tomorrow.

Please be careful of flooding of low-lying land, rising river water, and landslides due to heavy rain from early morning until evening on the 2nd tomorrow (Wednesday). Depending on the degree of rain cloud development, there is a risk of heavy rain reaching warning level.

In addition, there is a risk of tornadoes, strong wind gusts, lightning strikes, and hail from late today (Tuesday) to late tomorrow (Wednesday) 2nd.
Please be careful about outdoor activities and crop management. If there are signs that a cumulonimbus cloud is approaching, please take precautions such as moving to a sturdy building.



In the Tohoku region, please be careful of landslides, flooding of low-lying areas, and rising river waters due to heavy rain from early morning on the 2nd (Wednesday) tomorrow until Thursday the 3rd (Thursday).
Also, please be aware of damage to crops and agricultural facilities from tornadoes and other violent gusts, lightning, and hail from early morning until early evening on the 2nd (Wednesday) tomorrow.

In the Hokuriku region, the front is expected to move south from the 3rd (Thursday) to the 4th (Friday), so there is a possibility that the effects will be prolonged and there will be widespread warning-level heavy rain. From the 3rd (Thursday) to the 4th (Friday) the next day, please be careful of landslides, flooding of low-lying areas, and rising river waters.
Also, from the morning of tomorrow 2nd (Wednesday), please be careful of damage to crops and agricultural facilities due to violent gusts such as tornadoes, lightning strikes, and hail.

[Typhoon No. 24] Typhoon + autumn rain front leading to heavy rain in the second half of the week

2026/09/01 12:42

At 9:00 am on September 1st, a tropical cyclone became Typhoon No. 24 in the south of Japan at 22 35'N latitude and 131 55'E longitude.
The typhoon is currently at a standstill.
The central pressure is 996hPa, the maximum wind speed near the center is 18m/s, and the maximum instantaneous wind speed is 25m/s. Strong winds of 15m/s or more are blowing within 560km to the south and 390km to the north of the center.



After this, Typhoon No. 24 is expected to reach approximately 150 km northwest of Minami Daito Island on the morning of the 3rd and move north-northwest.
It is expected to head toward the waters near the Amami Islands on the morning of the 4th, and then change course to the north.
After the 5th, it is expected to slow down its movement and become stagnant in the south of Japan. From the 4th onwards, the forecast is highly uncertain, making it difficult to determine the course.

Also, from the 4th onwards, the front is expected to remain stationary near Honshu, making it easy for rain clouds to form.





Southerly winds from the typhoon will cause warm, humid air to flow over the front, leading to the front becoming more active and potentially causing heavy rain.
Please pay close attention to future typhoon and weather information.

Summary of weather and temperature (August 23rd to August 29th) Record heavy rain in Hokuriku Level 5 heavy rain special warning announced in Ishikawa-Toyama

2026/09/01 11:50

This is a summary of the weather and temperature from August 23rd to August 29th, 2026.

[About this period's weather]
#Characteristics of pressure distribution
On the 23rd, Typhoon No. 18 moved west-northwest near Ogasawara, and Typhoon No. 19 almost stopped in the Gulf of Tonkin. Typhoon No. 20 moved southwest through the Taiwan Strait. On the 24th, extremely strong typhoon No. 18 moved westward from the south of Japan. Additionally, Typhoon No. 21 formed east of the Philippines, and a cold front moved southward over Hokkaido. On the 25th, a strong typhoon No. 18 moved westward near the main island of Okinawa. A low pressure system accompanied by a front passed from the Sea of Japan to the southern part of Hokkaido. On the 26th, the autumn rain front stalled from the Sea of Japan to the Tohoku region, and powerful Typhoon No. 18 passed near Okinawa and moved westward through the East China Sea. On the 27th, an autumn rain front extended from the Sea of Japan to the Tohoku region, and powerful Typhoon No. 18 moved westward through the East China Sea. On the 28th, a low-pressure system with cold air in the sky moved northeast from the vicinity of Hokkaido to the waters near the Chishima Islands, and an autumn rain front extended to the vicinity of western and eastern Japan. In addition, Typhoon No. 18 moved westward through the East China Sea and made landfall in central China. On the 29th, an autumn rain front extended from the Sea of Japan to eastern Japan. Additionally, Typhoon No. 18 turned into a tropical cyclone in central China.
#Precipitation
On the 23rd, heavy rain occurred in the Sakishima Islands due to Typhoon No. 20. Daily precipitation on Yonaguni Island is 118mm. On the 24th, locally heavy rain occurred from Tohoku to Kinki. Tomi City, Nagano Prefecture 40.5mm/h. On the 25th, heavy rain fell in southern Hokkaido due to warm and humid air. At Hobetsu in Mukawa Town, it reached 61mm/h, the highest in recorded history. In addition, a linear rain belt formed in the Amami region due to Typhoon No. 18. On the 26th, it rained in Okinawa/Amami due to Typhoon No. 18. Daily precipitation exceeds 240 mm in Amagi, Kagoshima Prefecture. On the 27th, extremely heavy rain occurred from Hokkaido to Tohoku in front of a low-pressure system in the Sea of Japan. Record-breaking heavy rain of 100mm/h in a short period of time in Mashike Town, Hokkaido. Additionally, due to the effects of the autumn rain front, a Level 5 heavy rain special warning was announced in Ishikawa and Toyama prefectures. The heaviest rainfall in recorded history was 300 mm in Himi City, Toyama Prefecture, and 288 mm in Hakui City, Ishikawa Prefecture. On the 28th, a linear precipitation band occurred in Hokkaido. 70.5mm/h in Nemuro City, Hokkaido. Also, due to the influence of the autumn rain front, there was extremely heavy rain on the Sea of Japan side. Himi City, Toyama Prefecture 75mm/h. On the 29th, extremely heavy rain was observed around Hokuriku due to the influence of the autumn rain front. 64.0mm/h was observed in Miyama, Fukui City, Fukui Prefecture.
#Temperature
On the 23rd, western Japan was covered with a tall high-pressure system, causing clear skies and rising temperatures. On the 24th, it was sunny from western Japan to eastern Japan, and temperatures rose with warm air reaching 18 C or higher at an altitude of around 1,500 meters. 39.5c observed in Otsu City, Shiga Prefecture. At three other locations, the temperature exceeded 39 degrees Celsius, dangerously hot and exceeding body temperature. On the 25th, a high pressure area existed from western Japan to eastern Japan. The downflow of Typhoon No. 18 strengthened the power of the high pressure system, and there were four locations where the temperature exceeded 39 degrees Celsius, including 39.1 degrees Celsius in Yatsushiro City, Kumamoto Prefecture. On the 26th, western and eastern Japan were covered in a Pacific anticyclone, resulting in a severe lingering heat. Extremely hot days of 40c or higher were observed at two locations in Fukuoka Prefecture. Extremely hot days also affected 246 locations. On the 27th, a Pacific high-pressure system extended into western Japan, causing clear skies and rising temperatures in western Japan, resulting in extremely hot days in some places. On the 28th, there were some places in Kyushu and Shikoku that were covered in high pressure and the sun hit, making it an extremely hot day. On the 29th, the severe summer heat continued in western Japan. In the Kanto region, which was north of the front, the weather was cloudy and rainy, and the temperature did not rise during the day, making it moderately hot.



# Weather summary for this period (August 23rd to August 29th)
Average temperatures were above normal across the country, and in particular in northern Kyushu and the Seto Inland Sea in western Japan, there were many days when the sky was covered by a tall high-pressure system with warm air, resulting in record high temperatures of more than 3 degrees above normal. On the other hand, in Hokkaido, temperatures were below normal in the northern part of the island due to the influence of cool air from the Sea of Okhotsk High.
Due to the influence of humid air, the autumn rain front that extends from the Sea of Japan to the vicinity of northern Japan became more active, with many areas centered on the Sea of Japan and Hokkaido exceeding normal levels, and some areas around Hokuriku exceeding 400%. On the other hand, on the Pacific side, which was far from the front, many places were covered by high pressure and there were many sunny days that made it difficult for heavy rain to occur, resulting in a tendency for rainfall to be much lower than normal in many areas. On the other hand, the Nansei Islands received much more rainfall than normal due to Typhoon No. 18.
Sunshine hours were above normal in many locations as western Japan was covered in high pressure and had many sunny days. In eastern and northern Japan, many places were cloudy and rainy due to the influence of humid air and fronts, and temperatures were at or below normal. In the Nansei Islands, there were many cloudy and rainy days due to Typhoon No. 18 and humid air, and the weather was well below normal.

Today, September 1st (Tuesday), it is dangerously hot in western Japan, and a low pressure system has formed in the Sea of Japan.

2026/09/01 11:09

Today, the 1st (Tuesday), the area around Japan will be covered in high pressure, and strong sunlight will reach western Japan.
Temperatures are expected to reach 38 degrees Celsius in Toyooka City, Hyogo Prefecture, Tottori City, Tottori Prefecture, and Yonago City, Tottori Prefecture, and the rest of western Japan is also at risk of dangerously hot temperatures exceeding body temperature. Please take all possible measures to prevent heat stroke.



Meanwhile, a low pressure system that will form on a front near central China is expected to continue to develop over the 2nd, moving northeast and reaching west of Hokkaido.



In Hokkaido, the rain is expected to become heavier mainly in the southern part of Hokkaido, and the rain is expected to spread further on the 2nd (Wednesday). Please check the latest information frequently.



Also, as moist air flows toward low pressure, atmospheric conditions will become unstable in the afternoon over a wide area from northern to western Japan. Be careful of sudden thunderstorms and strong rain, and be sure to check the rain cloud radar when you go out.

September starts with severe lingering heat mainly in western Japan, cloudy and rainy in northern Japan

2026/09/01 06:58

Today, September 1st (Tuesday), the lingering heat continues to be severe, especially in western Japan, and many places are likely to experience extreme heat with temperatures exceeding 35c. On the other hand, clouds tend to spread over Hokkaido and Tohoku, and rain will spread over the area in the afternoon. In areas that have experienced heavy rain, such as Hokuriku, please be careful of landslides even if there is a little rain.



Today's 1st (Tuesday), the start of September, will be sunny during the day and a harsh lingering heat will continue from Kyushu to the Tokai and Hokuriku regions due to the influence of the Pacific high pressure system that extends near Honshu.





The maximum temperature will rise above 35c, with temperatures in Kanazawa, Osaka, Nagasaki at 35c, Fukuoka at 36c, Hiroshima, Matsue at 37c, Kyoto and Nara at 38c, and many places will experience extremely hot days. A heatstroke warning alert has been announced in 16 prefectures, mainly in western Japan, and the risk of heatstroke will continue into September, so please continue to take precautions against the heat, such as by frequently drinking water and salt and using appropriate air conditioning.

Hokkaido and Tohoku are prone to clouds spreading due to the influence of fronts and low pressure systems, and it is likely that rain will gradually increase in many places. Please note that there is a possibility of heavy rain in Hokkaido at night.
Although there will be periods of sunshine in the Kanto region, clouds will likely spread. There is a chance of showers mainly in the north. Hokuriku will also have periods of sunshine, but the atmospheric conditions will become unstable in the afternoon, leading to heavy rain in some places.

Although the sun will shine during the day from Kinki to Kyushu, the atmospheric conditions will be unstable in the afternoon, and localized areas are likely to see heavy rain accompanied by thunder.

Tomorrow, September 1st (Tuesday), it is dangerously hot in western Japan, and a low pressure system has formed in the Sea of Japan.

2026/08/31 15:56

Tomorrow, the 1st (Tuesday), the area around Japan will be covered in high pressure, and strong sunlight will reach western Japan.
Temperatures are expected to reach 38c in places such as Toyooka in Hyogo Prefecture, Maizuru in Kyoto Prefecture, and Kurume in Fukuoka Prefecture, and the rest of western Japan is also at risk of dangerously hot temperatures exceeding body temperature. Please take all possible measures to prevent heat stroke.



Meanwhile, a low pressure system that will form on a front near central China is expected to continue to develop over the 2nd, moving northeast and reaching west of Hokkaido.





In Hokkaido, the rain is expected to become heavier mainly in the southern part of Hokkaido, and the rain is expected to spread further on the 2nd (Wednesday). Please check the latest information frequently.

Weather for the week: From now on, watch out for the autumn rain front and typhoon trends. There is a risk of warning-level heavy rain due to the typhoon + autumn rain front.

2026/08/31 14:10

From now on, the weather is likely to change dramatically depending on the autumn rain front and the movement of a tropical cyclone located south of Japan as of noon today, Monday, the 31st (expected to become a typhoon within the next 24 hours).
In particular, depending on the autumn rain front and typhoon trends, there is a possibility of warning-level heavy rain.



Tomorrow, the 1st (Tuesday), the first day of September, will have a similar atmospheric pressure distribution as today, the 31st (Monday). The lingering heat is severe in western Japan, which is covered by high pressure, so please be careful of heatstroke. Inland areas will experience localized rain and thunderstorms in the afternoon.
In northern Japan, the weather will gradually go downhill due to the effects of low pressure and fronts, and it will rain on the 2nd over a wide area of Hokkaido and northern Tohoku. In Hokkaido in particular, there is a possibility of warning-level heavy rain in southern and central Hokkaido, so please pay close attention to future weather information.



Also, the tropical cyclone moving south of Japan is expected to become a new typhoon by tomorrow 1st (Tuesday). Although the current forecast (as of noon on the 31st) is that there will be no strong winds, caution is needed as the moist air around the typhoon may activate the autumn rain front and cause heavy rain over a wide area.

On the 3rd (Thursday), rain is expected to occur over a wide area around Honshu due to the influence of the autumn rain front. In particular, the Hokuriku region, which was hit with record-breaking heavy rain that reached special warning levels last week, is at risk of experiencing heavy rain again.
On the 4th (Friday), as the autumn rain front moves southward, the area of rain is expected to shift from western Japan to the Pacific side of eastern Japan. The warm, humid air from the typhoon increases the activity of the autumn rain front, which can lead to increased rainfall and heavy rainfall even in areas far away from the typhoon.
Please be careful about the occurrence of heavy rain disasters such as flooding of low-lying land, rising river waters, and landslides, and be sure to check the latest weather information that will be updated in the future.




Until around the 2nd and 3rd, the high pressure system south of Japan will be strong in western and eastern Japan, and there will be some places where the lingering heat will be severe. Around the 2nd, the effect of cool easterly winds from the high pressure system on the Sea of Okhotsk side will weaken in the Tohoku Pacific side and Kanto region, and the heat is likely to return. From around the 3rd to 4th, the autumn rain front will move southward over Honshu, and the heat is expected to subside over a wide area from western to eastern Japan. However, the warm and humid air from typhoons tends to enter the area, so even if it's not extremely hot, it will still feel humid.

There will be many rainy days in Okinawa from now on. Depending on the path and strength of the typhoon, there is a risk of severe weather, so please be careful.

Two tropical cyclones are expected to become typhoons within the next 24 hours. Pay attention to future typhoon information.

2026/08/31 12:10

Today, the 31st (Monday), it was announced that two tropical cyclones are expected to develop into typhoons within 24 hours.

The first one is Tropical Cyclone A, which is located in South China as of 9am. This tropical cyclone was formerly Typhoon No. 18 (Soudel), and is expected to change its course eastward, head out over the South China Sea, and then develop into a typhoon again.
If it becomes a typhoon again, the original number will be used and it will be called Typhoon No. 18 again.

In this way, so-called "revival typhoons," which once transform from a typhoon to a tropical cyclone and then re-emerge as a typhoon, are said to occur only a few times a year or once every few years, making them rare. A recent example is Typhoon No. 8 (Komei) in July 2025, when a "revival typhoon" approached Okinawa and brought heavy rain.



This time, Tropical Cyclone A is expected to move eastward in the South China Sea and approach near Taiwan before becoming a tropical cyclone again.
Currently, it is not expected that there will be any major impact in the area around Japan, but please pay close attention to future information.

One more thing: Tropical Cyclone B, which will become a typhoon within the next 24 hours, is heading north over the southern seas of Japan. If it develops into a typhoon, it will be called Typhoon No. 24.
Tropical Cyclone B is expected to remain stationary in the south of Japan and become a typhoon by tomorrow 1st (Tuesday). Immediately after it becomes a typhoon, it is expected to move slowly, but after that it is expected to accelerate northward and approach Okinawa around the 3rd (Thursday).
Regarding the course from Friday the 4th, the range of the forecast circle is large, and the predicted course has a wide range. However, we cannot deny the possibility that it may approach Honshu after the 4th (Friday), so caution is required.

In addition, from the 4th (Friday) onward, the autumn rain front will move southward, and the moist air from the typhoon will activate the front, causing heavy rain mainly in areas on the Pacific side of western and eastern Japan. Please pay attention to the latest typhoon information that will be updated in the future.




#Typhoons in 2026 (as of August 31)
21 typhoons have already occurred this year, 2026.

This year, 2026, typhoons are occurring at a faster than normal pace. The average number of typhoons in August is 5.7, but this August there have already been 8 typhoons. If typhoon No. 24 occurs by today, the 31st (Monday), it will be the 9th typhoon to occur this month.

August and September are times when, compared to previous years, the number of typhoons occurring, approaching, and making landfall increases. Especially at this time of year, warm, humid air from the typhoon flows toward the autumn rain front, which can cause heavy rain even in areas far away from the typhoon on the Pacific side.

Please pay attention to the latest typhoon information that will be updated in the future and prepare as much as possible for typhoons.

The lingering heat continues to be severe from the Tokai region to the west, so be careful of heatstroke

2026/08/31 06:48

Today, the 31st, will be the last day of August, and high pressure will continue to cover western and eastern Japan, allowing sunlight to reach a wide area from the morning. Continuing from the previous day, the weather is expected to be sunny from the Tokai region to western Japan, with temperatures rising during the day, leading to extremely hot days with maximum temperatures of 35 C or higher and a severe lingering heat.
Today's highest temperature is expected to be in Nara, reaching 38 degrees Celsius, a dangerously hot temperature exceeding body temperature. In other regions, the heat can be as hot as body temperature, so you need to be careful about heat stroke.

On the other hand, the temperature in northern Japan does not rise much, making it a relatively pleasant experience.
In the Kanto region, clouds will spread and there will be no places where it will be extremely hot, but it will be a hot and humid day. It would be a good idea to choose clothes that are breathable.

The predicted maximum temperature in each region is Sapporo 24c, Sendai 26c, Tokyo 29c, Kanazawa 34c, Nagoya 36c, Osaka 36c, Kochi 34c, and Fukuoka 35c.



The Ministry of the Environment and the Japan Meteorological Agency have issued heatstroke warning alerts from western Japan to the Tokai region, covering 26 prefectures.

#Area covered by heat stroke warning alert
Shizuoka, Aichi, Mie, Fukui, Shiga, Kyoto, Osaka, Hyogo, Nara, Wakayama, Okayama, Hiroshima, Shimane, Tottori, Tokushima, Kagawa, Ehime, Kochi, Yamaguchi, Fukuoka , Oita Prefecture, Nagasaki Prefecture, Saga Prefecture, Kumamoto Prefecture, Miyazaki Prefecture, Kagoshima (excluding the Amami region)

In areas where a heatstroke warning has been issued, there is a risk of damage to human health due to heatstroke due to extremely high temperatures.
Please refrain from activities during hot hours as much as possible, and be conscious of taking frequent breaks and replenishing hydration and salt intake.
Also, try to stay indoors in a cool environment by using an air conditioner, and take precautions against heatstroke indoors.