[1-month forecast] Temperatures will be high nationwide in August. Take precautions against heat stroke and be careful of typhoons.

2026/07/30 23:29

On the 30th (Thursday), the Japan Meteorological Agency announced the forecast for the month from August 1st to 31st.

Over the next month, temperatures are expected to be high as the country will likely be covered in warm air. In particular, temperatures are expected to be quite high in northern and western Japan during the first half of the period.
Okinawa/Amami is susceptible to typhoons and humid air during the first half of the season, so there will be a lot of precipitation.



Prediction results from the numerical forecast model.
Monthly average sea level pressure (figure on the left) shows that a low pressure system is predicted to the south of Japan, and in the first half of the period, Okinawa and Amami are expected to be affected by typhoons and humid air. On the other hand, the atmospheric pressure is high near Hokkaido, and during the first half of the period, it is likely to be covered in high pressure mainly over northern Japan and the Sea of Japan side of eastern and western Japan.

The temperature at an altitude of approximately 1,500 meters (figure on the right) will be higher than normal near Japan, especially in northern Japan, and the whole country will likely be covered in warm air.




Forecast of average temperature, precipitation, and sunshine hours for the next month, and weekly average temperature (probability of occurrence (%)).

The average temperature will be high as the whole country is likely to be covered with warm air. In particular, temperatures are expected to be quite high in northern, eastern, and western Japan during the first half of the period.

Northern Japan and the Sea of Japan side of eastern and western Japan are likely to be covered by high pressure during the first half of the period, so precipitation will be at or below normal and sunshine hours will be at or above normal. It looks like there will be more sunny days compared to normal years.

The Pacific side of eastern and western Japan will have many sunny days, similar to normal years.

Okinawa/Amami will be susceptible to the effects of typhoons and humid air during the first half of the season, so precipitation will be high and sunshine hours will be at or below normal. It is expected that there will be fewer sunny days compared to normal years.


In August, temperatures are expected to be higher than normal across the country. The severe heat is expected to continue, so please continue to take precautions against heatstroke.
I'm sure some of you are planning some outdoor leisure activities during your summer vacation. Please take frequent breaks, replenish water and salt, and use a parasol and hat.
Please check the "Heatstroke Warning Alert" jointly announced by the Japan Meteorological Agency and the Ministry of the Environment, and consider changing your plans on the day it is announced.
Even if you spend your time indoors, please use your air conditioner appropriately, including at night.

Also, August is the month with the highest number of typhoons. Particularly in Okinawa and Amami, rainfall may increase due to the effects of typhoons, etc., so please check the latest information and prepare for disasters such as heavy rain.
Currently, Typhoon No. 13 is moving west-northwest near Wake Island with ferocious force. Around August 3rd, it is expected to move towards the waters near Ogasawara with very strong force. After that, depending on its path, it may approach areas from western Japan to the Nansei Islands. Please check the latest information.

Weather for tomorrow 31st (Friday) Beware of heavy rain and thunderstorms in Tohoku; extreme heat continues from Kanto to the west

2026/07/30 18:57

Tomorrow, the 31st (Friday), the weather will continue to be cloudy in northern Japan. The Tohoku region needs to be careful of localized heavy rain. The heat is likely to continue from eastern to western Japan.



There will be a lot of clouds all over Hokkaido, and there will be places where it will rain. It's safe to have rain gear when going out.
Tohoku will also have a lot of clouds, and there will be places with localized heavy rain and thunderstorms. There is a risk of heavy rain, so vigilance should be taken against landslides, flooding of low-lying areas, and rising and flooding rivers. Even on the Pacific side, there are places with showers, so please be careful of changes in the sky.

From eastern Japan to western Japan, many places will be covered in high pressure and will be sunny. Tomorrow is also likely to be dangerously hot, especially in inland areas. In Kumamoto Prefecture, which has been hit hard by earthquakes, heatstroke prevention measures are still essential, with forecasts of 37 degrees Celsius in Hitoyoshi City and 36 degrees Celsius in Kumamoto City. Those involved in recovery work should be careful of heat stroke.
In addition, it is expected to be an extremely hot day in various places, with Tokyo expected to be 36 C, Nagoya 38 C, Osaka 36 C, and Fukuoka 36 C. In inland areas, there are places where the heat approaches an extremely hot day, so vigilance is required.

[Life-threatening heat] Extreme heat of 40 degrees Celsius predicted for areas affected by the Kumamoto earthquake (Commentary: Weather forecaster Atsuko Miyake)

2026/07/30 15:09

The areas affected by the Kumamoto earthquake are expected to experience extremely hot days next week, with maximum temperatures exceeding 40 degrees Celsius.

While the power outage continues, some people are working on recovery efforts.
Please be extremely careful about heat stroke, such as staying hydrated frequently and working within reasonable limits.



Let's take a look at the expected maximum temperature in the weekly forecast.

The Kyushu region will continue to experience extremely hot days with temperatures exceeding 35c.
And on the 3rd (Monday), Saga and Kumamoto are expected to experience extreme heat of 40 degrees Celsius.
Neither Saga nor Kumamoto has ever experienced an extremely hot day with temperatures above 40c.

Let's take a look at the highest temperatures so far in the disaster area, Kumamoto.



The highest temperature so far in Kumamoto is 38.8c.

Statistics began in 1890, so this means that this will be the hottest day in over 130 years.



One of the causes of this heat is typhoons.

Typhoon No. 13 became a fierce force near Wake Island.

It is expected to continue moving westward with ferocious force.

The stronger this typhoon gets, the stronger the updrafts will be above the typhoon.
When the updraft strengthens, it hits the ceiling of the air, which intensifies the downdraft in the surrounding area.

As the typhoon strengthens, the high pressure system south of Kyushu strengthens,
causing intense heat around Kyushu.


From now on, the typhoon will continue to move slowly westward while maintaining its ferocious strength, so the
cyclone is expected to remain in the same position for a while.

For this reason, it looks like the intense heat will continue in Kyushu.



Looking at the weekly forecast, the Kyushu region will continue to be sunny and extremely hot.

The first half of next week will see plenty of sunshine, and the heat will continue to drain your physical strength.

A typhoon will approach in the second half of next week, and clouds will gradually increase.
I'm looking to see if there's a slight change in the weather here.

However, the intense heat is likely to continue, so please continue to be careful about heatstroke.

I hear that many people are sleeping in their cars.
If you are sleeping in your car, please take measures such as
parking it in the shade of a tree to prevent the car from overheating.
Please continue to take good care of yourself and do not overdo it.

[Typhoon No. 13 intensifies, Honshu experiences record heat] 40 degrees Celsius expected in Kumamoto (Commentary: Weather forecaster Atsuko Miyake)

2026/07/30 14:11

From now on, we need to be careful about the path of Typhoon No. 13 and the intense heat around Honshu.



Information on Typhoon No.13.
Typhoon No. 13 became a ferocious force.
It is located near Wake Island and is moving west-northwest at 20 km/h.

The central pressure is 910hPa and the maximum instantaneous wind speed is 80m.
This typhoon is expected to further drop its central pressure to 905 hPa by tomorrow (Saturday).
It is expected to maintain its fierce power until around the 2nd (Sunday).
After that, from the 3rd onwards, the central pressure will increase a little, becoming a very strong force, and the rank will drop by one.

However, there is still a risk that it will approach the Ogasawara Islands, where Chichijima and Hahajima are located, at around 925 hPa.

Chichijima and Hahajima are expected to experience heavy rain at the beginning of the week due to the effects of the typhoon.



Now, let's take a look at the rain and wind forecast for 3pm on the 4th (Tuesday).
The Ogasawara Islands include Chichijima to the north and Hahajima to the south.

According to current forecasts, this time period is when the center of the typhoon is closest.

A strong wind will blow in the Ogasawara Islands from the 3rd to the 4th, and there is a risk that the sea will become turbulent or violent.
Also, depending on the path, heavy rain may become a warning level.
Be prepared for strong winds, high waves, and heavy rain this Saturday and Sunday.
Be sure to put away items that are easily blown away.



And as for predictions of the future course,
still predictions vary considerably depending on each model.
This is the result of one predictive model.
This model predicts that the typhoon will develop again from next week onward and move westward.

Also, there is a possibility that it will move westward with a very strong force and approach the Nansei Islands and Kyushu region, so
Please continue to pay attention to the latest information.

As this typhoon develops, high pressure will become stronger near Honshu.
When the high pressure system strengthens, it becomes sunny and extremely hot.



Let's take a look at the latest weekly forecast.
It is predicted that western Japan will continue to experience extremely hot days of 35 degrees or higher, especially in eastern Japan.
It continues to be extremely hot, especially in western Japan.

And in Kumamoto, which was severely damaged by the recent earthquake, it is predicted that the 3rd (Monday) will be a very hot day with temperatures reaching 40 degrees Celsius.

Kumamoto's temperature of 38.8c is the highest ever recorded, so it will be the hottest day ever.
It looks like the heat will break all previous records.

If you are working on restoration work, please be extremely careful to avoid heat stroke.



, we will look at the weather in various places.
The intense heat and sunny weather will continue in western Japan and the Tokai region.
In the Kanto region, the extremely hot days with temperatures of 35c or higher are expected to continue until around the 2nd (Sunday), but
the clouds will spread more easily next week and the heat will subside a little.

In Hokuriku and northern Japan, rain will continue into the 1st (Saturday).
Especially in Niigata and the southern part of Tohoku, moist air will continue to flow in, and heavy rain is likely to continue.
Please be careful about how it rains from now on.

Next week, the Hokuriku and Tohoku regions are finally expected to be covered in high pressure and clear skies.
The rainy season is likely to end in Hokuriku and Tohoku as well.
The heat is coming again all of a sudden, so please be careful of heatstroke.

Typhoon No. 13 (Dolphin) is moving west-northwest with "violent" force

2026/07/30 08:07

As of 06:00 on the 30th, the ferocious typhoon No. 13 is moving west-northwest near Wake Island at a speed of approximately 20 kilometers per hour. The atmospheric pressure at the center of
is 920 hectopascals, the maximum wind speed near the center of
is 55 m, and the maximum instantaneous wind speed is 75 m.




It is expected to approach the Ogasawara Islands with very strong force on the 4th of next week, and there is a risk that it will have an impact on Japan even after that.
Please pay attention to the latest typhoon information.

Severe heat due to overhanging high pressure area - Warning of high temperatures of around 40c in the disaster area

2026/07/30 06:19

There is a high pressure system in the East China Sea and it is stagnant.
This high pressure system is expected to move slowly south-southwest over the East China Sea into tomorrow, and is expected to keep clear skies while covering a wide area.



Meanwhile, from the 30th to the 31st, the upper-level high pressure system centered near the Korean Peninsula is expected to strengthen its overhang toward western Japan.
Due to the influence of this upper-level high pressure system, the atmosphere in western Japan will be strong and stable, and the period of time when sufficient sunlight will reach the area will be extended.
As a result, temperatures are likely to be significantly higher than normal, leading to extremely hot days, especially in the Tokai region and western Japan.



Also, as the humidity remains high, it is expected that the perceived heat will increase even more than the temperature.
The risk of heatstroke will further increase as the temperature slows down at night, making it difficult to sleep at night in many regions.



Even in Kumamoto, the affected area, extreme heat is expected to reach around 40c until the 31st. People who are placed in unusual living environments, such as working outdoors or taking evacuation actions, need to be especially careful.
Please continue to take precautions against heatstroke, such as hydrating frequently, finding a place to rest, and using air conditioning appropriately, and continue to be even more vigilant in managing your health.

Atmospheric conditions will be unstable nationwide from tomorrow until the 31st; watch out for heavy rain, lightning, and gusts of wind

2026/07/29 19:33

From tomorrow until the 31st (Friday), atmospheric conditions will become unstable across the country, leading to the risk of heavy rain.
The Japan Meteorological Agency has released "General weather commentary information (heavy rain, lightning, gusts) No. 5".
Please pay attention to future weather information and disaster prevention information, and be aware of sudden changes in weather even in sunny areas.



A front is extending from the Izu Islands to the east of Japan, and the low pressure on the front is moving east-northeast in the east of Japan. Additionally, a low-pressure system near Primorye is moving southeast and is expected to approach northern Japan on the morning of the 30th (Thursday).
Furthermore, cold air with a temperature of -6 degrees Celsius or lower is flowing into the air at an altitude of about 6,000 meters.

From tomorrow, the 30th (Thursday), atmospheric conditions will become extremely unstable from northern to western Japan due to the effects of cold air in the upper atmosphere, warm, humid air flowing toward low pressure systems and fronts, and the effects of rising temperatures during the day. Heavy rain accompanied by thunder or very heavy rain is expected in some places.
There are areas where the ground has become loose due to heavy rains, so even a small amount of rain can increase the risk of landslides.

Also, the atmosphere is expected to remain extremely unstable in northern and eastern Japan, as they will continue to be affected by other low-pressure systems and cold air in the upper atmosphere.

Please pay attention to disaster prevention weather information that will be announced in the future.
Please check the forecast and risk level of rain in your area from the Japan Meteorological Agency website (short-term rainfall forecast), Nowcast, and Kikikuru.

[Rain Forecast]
Expected 24-hour rainfall from today, 29th (Wednesday) 18:00 to tomorrow 30th (Thursday) 18:00,
Tohoku region: 100 mm
Hokuriku region: 150 mm
After that, it is expected to be from 18:00 on the 30th (Thursday) the next day to 18:00 on the 31st (Friday) the day after. 24-hour rainfall is high in the Tohoku region, 80 mm
, and the Hokuriku region, 120 mm
[Disaster prevention matters]
Please be careful of landslides, flooding of low-lying areas, and rising river waters from today, the 29th (Wednesday) in western Japan, and from northern Japan to eastern Japan tomorrow, the 31st (Friday).
Also, from northern to western Japan, be careful of strong gusts of wind that can cause lightning and tornadoes. If there are signs that a cumulonimbus cloud is approaching, please take precautions such as moving inside a building. There is also a risk of hail, so please be careful when managing crops and agricultural facilities.

Today's 29th (Wednesday) weather: Continued rain in northern Japan and Hokuriku

2026/07/29 07:01

The low pressure system in the Sea of Japan is expected to pass over Hokuriku and become unclear, and a new low pressure system is expected to form on the front along the southern coast of eastern Japan.



Due to the effects of low pressure, northern Japan and Hokuriku are likely to experience heavy rain and humidity today. It will start raining in Hokkaido in the afternoon, so please bring an umbrella with you. The rain in the San'in region will last until mid-morning, and is expected to gradually subside in the afternoon.
The sun is expected to reach the Kanto region, and the intense heat is expected to return. There is a chance of showers and thunderstorms in the afternoon, especially inland, so it's a good idea to bring a foldable umbrella. Temperatures will rise to around 35 C during the day.
The sun will shine from the Tokai Sea to the west, and intense heat is expected. The maximum temperature will rise to the same level as yesterday, with some places likely to approach 40 degrees Celsius. There is a risk of sudden changes in the weather in the afternoon, especially in inland areas. Please continue to be as careful as possible to avoid heat stroke.

Today, the 28th (Tuesday) Atmospheric instability: warning for thunder, heavy rain, and sudden weather changes in eastern and western Japan

2026/07/28 11:56

The front is extending from the Pacific coast of eastern Japan to the east of Japan, and is expected to remain mostly stationary until the 29th.
Also, a low pressure system in the Sea of Japan will approach the Hokuriku region on the night of the 28th, and another low pressure system is expected to form on the eastern front of the Kanto region on the morning of the 29th.





While warm, humid air is flowing towards the low pressure system and front,
at an altitude of approximately 6,000 meters, a pressure trough with cold air below -6 degrees Celsius will pass near Honshu into the 29th, and with the added influence of rising temperatures during the day, atmospheric conditions are expected to become extremely unstable from the Tohoku region to western Japan.

Eastern to western Japan will need to be careful of sudden changes in the weather today and tomorrow.
Be careful of sudden changes in weather from eastern Japan to western Japan. Particularly from the Tohoku region to eastern Japan, there will be localized heavy rain accompanied by thunder or extremely heavy rain, resulting in heavy rain in some places.



[Rain Forecast]
24-hour precipitation forecast from 6:00 am on the 28th to 6:00 am on the 29th (where there is a lot of precipitation)
Tohoku region 80mm
Kanto-Koshin region 120mm
Hokuriku region 150mm
Tokai region 120mm
Kinki region 100mm
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Then, 24-hour precipitation expected from 6:00 on the 29th to 6:00 on the 30th (highest areas)
Tohoku region 80mm
Hokuriku region 100mm

There are areas where the ground has become loose due to previous heavy rains, so even a small amount of rain can increase the risk of landslides. Please pay attention to the latest information and be careful of landslides, flooding of low-lying areas, and rising river waters.

Weather forecast for today, the 28th (Tuesday): Western Japan is on alert for dangerous heat; Tohoku and eastern Japan are at risk of extremely heavy rain

2026/07/28 06:56

Today, the 28th (Tuesday), western Japan will continue to be covered in midsummer high pressure, resulting in severe heat.
Yesterday, the 27th (Monday), was an extremely hot day with temperatures reaching 40.0c in Hita City, Oita Prefecture. Today, the 28th, temperatures are expected to reach dangerously close to 40 degrees Celsius in some places, with temperatures expected to reach 39 degrees Celsius in Kurume City, Fukuoka Prefecture, and Hita City, Oita Prefecture. The heat will be dangerous, so please be extremely careful to avoid heat stroke. Rain clouds and thunderclouds are likely to develop in the afternoon due to rising temperatures and humid air, so please be careful of sudden changes in weather and severe thunderstorms especially in the inland and mountainous areas from Kinki to Kyushu.



The area from Tohoku to eastern Japan will be affected by a low pressure system moving through the Sea of Japan and a front stationary to the east of Japan. Atmospheric conditions become extremely unstable due to the effects of cold air in the upper atmosphere, rising temperatures during the day, and humid air.
As of 6:30 a.m., rain clouds have developed over the Sea of Japan and are approaching the Hokuriku region. In Hokuriku, there are some places where it will rain from the morning, and there are likely to be places where there will be heavy rain accompanied by local thunderstorms.
In the afternoon, the rain is expected to spread further from Tohoku to eastern Japan, and there is a risk of extremely heavy rain with thunderstorms of more than 50mm per hour depending on the location.



The ground is loose in some places due to the heavy rains so far, so please be careful of landslides, be careful of flooding of low-lying land, flooding of roads, rising water and flooding of rivers, and be careful of strong gusts of wind such as lightning and tornadoes. Please be sure to check the latest traffic information, as the period of heavy rain may overlap with the time of your return home.