Autumn rain front again to Japan tomorrow and tomorrow, the Tohoku Sea of Japan side, and the fear of heavy rain on the southern Kanto region, including Tokyo,

2025/09/16 12:05

#Autumn rain front returns to Japan again tomorrow, heavy rain will rain on the Sea of Japan side of the Tohoku region
Today, the 16th (Tuesday), the area around Japan is covered with high pressure, and the sun is reaching a wide range of air conditioning.
However, the autumn rain front is stagnating in mainland China, and will likely reach the central Japan Sea tonight, and tomorrow, the 17th (Wednesday) to the northeast.
The next day, the 18th (Thursday), is expected to head south from west to eastern Japan.



In Tohoku, the atmosphere will be extremely unstable due to the effects of warm, humid air heading towards the front line from the morning of the 17th (Wednesday) to the 18th (Thursday).
In particular, on the Tohoku Sea of Japan side, there are areas where heavy rain falls, like a 40mm bucket flipped over an hour due to lightning.
The 24-hour precipitation until the morning of the 18th (Thursday) is expected to be 100mm at a high location, and if the rain clouds develop more than expected or stagnate in the same location, there is a risk of heavy rain at the warning level.
Also, heavy rain of 30mm per hour will fall on the Tohoku Pacific side.
We expect the 24-hour precipitation to be 50mm until the morning of the 18th (Thursday).



On the Tohoku Sea of Japan side, beware and beware of landslides caused by heavy rain, flooding of low landslides, and rising rivers from tomorrow morning, Wednesday the 17th to the 18th (Thursday).
In addition, in Tohoku, be careful of damage to agricultural crops and agricultural facilities caused by severe gusts of winds such as tornadoes and lightning strikes, hail, from dawn to late at night, tomorrow, the 17th (Wednesday) to the end of the night.

#Autumn rain front: It will go down south of the west to south of the east Japan; heavy rainfall in Kanto; warning level in Kanto
Tomorrow, the 18th (Thursday), the autumn rain front is expected to go south of the west to south of the east Japan.
Also, the front line will become more active as the pressure valleys above pass through.
There are some areas where rain will be temporarily falling along the Sea of Japan side of the Western Japan, eastern Japan, and Tohoku.
Thunderclouds will also develop locally in the southern Kanto region, such as in Tokyo, and there is a risk of heavy rain at the level of warning.
Please be careful of the latest information.

Weekly weather forecast: Cloudy and rain due to the autumn rain front - the severe heat finally settles

2025/09/16 07:27

Over the next half of the week, it is likely that there will be more cloudy and rainy weather due to low pressure and front lines. However, the extreme heat will calm down.



The autumn rain front will be stagnant around Honshu tomorrow, the 17th (Wednesday). Warm and humid air will flow towards the front, and the rain will expand from Thursday the 18th, mainly in the region on the Sea of Japan side of northern Japan and western Japan. There are areas where heavy rain is locally accompanied by lightning, and there is a risk of heavy rain on the Sea of Japan side of the Tohoku region. Be careful of landslides, road flooding, and river flooding.



From the 19th to 20th, the area around Honshu is likely to be affected by low pressure and autumn rain fronts, and there will be many cloudy and rainy areas. However, as the front moves south, there will likely be many places where the heat will subside.
In Hokkaido and northern Tohoku, the autumn atmosphere will be enveloped in advance, and autumn leaves will gradually progress on high mountains.
In the Kanto region, due to the effects of cool winds from the northeast flowing, many places will not reach the expected maximum temperature of 30 C. However, the clouds are expected to continue and there are many days when it doesn't feel refreshed.
In western Japan, the expected maximum temperature is likely to be around 30 C, but it is unlikely that it will be extremely hot, such as a hot day ahead.


The harsh heat is finally upon us, and we are beginning to see an end. However, this is also the change of seasons, so please be careful when taking care of your health.

Today, the 16th (Tuesday) After the holidays, the area will be sunny. Be careful of sudden changes in weather in the afternoon, even in places where there is no umbrella mark.

2025/09/16 06:19

Today, the 16th (Tuesday), the end of the three-day holiday, will be covered in large high pressure areas around Honshu, with many areas likely to be sunny.
However, there are a lot of clouds in the Kanto region, and there is a possibility of rain in the morning. It would be a good idea to have an umbrella when you go out. It's sunny in the afternoon and the sun is likely to arrive.


The air in Hokkaido is likely to be dry and dry. There is a warm air around Honshu, so severe heat will continue throughout the area. Many of the expected maximum temperatures are above 30 C, and there are likely some places where the temperature is extremely hot in the area west of Tokai, with 37 C in Nagoya and 36 C in Osaka. Be careful of heat stroke.



In the afternoon, the air condition becomes unstable due to rising daytime temperatures and the effects of humid air. Rain clouds and thunder clouds are likely to develop mainly along mountains and inland, and rain clouds can suddenly develop in urban areas, causing guerrilla thunderstorms. Even if the weather forecast does not have an umbrella mark, the weather may change dramatically in the afternoon, so it is a good idea to go out with a folding umbrella just in case.

Even though the heat is severe, the footsteps of autumn gradually approach from around the weekend.

2025/09/15 17:59

A high pressure system is heading eastward off Sanriku.
In addition, there is a high pressure system in the southern seas of Japan, and it is almost stagnant.
On the other hand, the front extends from Japan's East Sea to East and West Japan, and from the Yellow Sea.

Today, the days were severely lingering from Tokai to Kyushu, when the sun was shining, and many of the areas were extremely hot, with the highest temperature exceeding 35 C.






[As of 5pm]
All over Japan, there are 515 midsummer days above 30c, and
31 hot days above 35c.

The top 10 highest temperature rankings are
1 Mie Prefecture Kuwana City Kuwana 36.9 c
2 Oita Prefecture Bungo-Ono City Inukai 36.2 c
2 Aichi Prefecture Toyota City Toyota 36.2 c
4 Kochi Prefecture Shimanto City Egawasaki 36.1 c
4 Shizuoka Prefecture Tenryu Ward, Hamamatsu City Tenryu 36.1 c
6 Tokushima Prefecture Mima City Anabuki 35.9 c
7 Kagoshima Prefecture Kanetsugu-cho, Hinata County, Kagoshima Prefecture Hinata Maeda 35.8 c
7 Gifu Prefecture Mino City Mino 35.8 c
7 Aichi Prefecture Shinshiro City Shinshiro 35.8 c
10 Shizuoka Prefecture Hamamatsu Chuo Ward Hamamatsu 35.7 c

Starting tomorrow, the 16th (Tuesday), after the holidays, the 16th, the summer air is covered in western Japan, and the heat will be severe.
This severe heat is likely to last until around the middle of the week, so please be careful not to let your guard down and take care of your health, such as heat stroke.




However, from the second half of the week to the end of the week, the autumn rain front went south and the weather fell, and after that, temperatures have been on a downward trend in western Japan as well, and
It seems that autumn air will start to enter the Kanto, Koshinetsu for the time being.

However, it is still around normal, and the monthly forecast predicts that temperatures will be higher than normal even through October, but
It seems that the harsh heat will gradually fade away.

Summer is still in mid-September: Extremely hot days forecast in Nagoya and Osaka; heatstroke warning alert announced in 13 regions

2025/09/15 06:57

Today, the 15th, many areas will exceed 30 C from eastern to western Japan, and the temperature will be covered in warm air, mainly on the Pacific side, so it will likely be a severe heat. The estimated maximum temperatures are 31 C in Tokyo, 36 C in Nagoya, 35 C in Osaka, 32 C in Kanazawa, 34 C in Kochi, and 33 C in Fukuoka. It's mid-September, but you should continue to be careful of heat stroke.


Northern Japan will also be covered by high pressure, and temperatures will likely rise in various places than the previous day. The estimated maximum temperatures are 28c, Obihiro 29c, and Akita 29c in Sapporo. It gets cold in the mornings and evenings, especially inland areas, so be careful of the temperature difference between the day.



The Ministry of the Environment and the Japan Meteorological Agency have issued heatstroke warning alerts from Tokai to Okinawa, and have been announced for 13 regions.


In areas where a heatstroke warning alert has been issued, significantly higher temperatures can cause damage to human health due to heatstroke.
There are probably many people who plan to go out on their days off, but please continue to refrain from activities during hot times as much as possible, and be careful to take frequent breaks, drink water and salt.
Also, use air conditioners indoors to ensure that you stay in a cool environment and take full advantage of heatstroke prevention indoors.

Weather today, Monday the 15th: Sunny in Northern Japan; Beware of changes in the sky from East to Western Japan

2025/09/15 06:32

Today, the last day of the three-day holiday, the 15th (Monday), the front that heads south through Honshu will become unclear, and the Pacific side of northern Japan and western Japan will be covered by high pressure and the sunlight will be reached. It looks like the sky will be dominated by clouds in the Kanto region.



There are many sunny spots in northern Japan, making it seem like a calm and cheerful atmosphere. The temperatures rise during the day, but it gets cold in the mornings and evenings, so be careful of the temperature difference between the day. Also, it will rain in the Soya region in the afternoon, so if you are going out, please bring rain gear.


Although the sunlight occasionally reaches the Sea of Japan side of Kanto, Hokuriku, and western Japan, the sky is easily spreading with clouds. There is a lot of sunlight on the Pacific side from Tokai to Kyushu, and temperatures are likely to rise. Be careful of heat stroke.
Also, in the afternoon, there are some areas that cause sudden thunderstorms, mainly along the mountains from eastern to western Japan, so be careful of changes in the sky.

"Heavy rain and the heat return" - Will it be a hot day come back today after four days Will the heat end up until the equinox [Weekly Weather]

2025/09/14 12:32

Today, Sunday the 14th, the 14th (Sunday), a day of the holidays, is moving eastward around Hokkaido, as the
low pressure system develops, and a front extending from the
low pressure system is heading south through Honshu.



In particular, rain and wind are increasing intensifying in Hokkaido, which is near the center of the low pressure system.

Rain is the highest in history of 344.0 mm, the 24-hour rainfall until 9:50am, Noboribetsu City, Hokkaido.


The month's rainfall in September, normal year, has fallen in just one day.

The wind was observed at Cape Erimo, Hokkaido, at the beginning of dawn today, at the peak of 29.4m/s.


The low pressure system, which is causing rough weather, will be separated from Hokkaido until tonight, and strong winds are expected to subside at night.


On the other hand, in the vicinity of Honshu, where the front extends from the low pressure system, the atmosphere condition is extremely unstable due to the effects of warm, humid air heading towards the
front.





Rain clouds and thunder clouds will develop everywhere in northern and western Japan through tonight, and there will be some places where extremely heavy rain with thunder will fall
Local heavy rain.



[Expected rainfall (at places where it is high)]
The 24-hour precipitation expected by 6am tomorrow, the 15th (Monday, public holidays) is
: Tohoku region: 60mm
: Hokuriku region: 80mm
: Chugoku region: 80mm
: Northern Kyushu region: 100mm
:


There are some areas where the ground has been loosened due to rainfall so
Even with little rainfall, the risk of landslides can increase.

Beware of landslides, flooding of low landslides,
/But beware of river flooding and flooding.


Also be careful of severe gusts of wind, such as lightning strikes and tornadoes.




/BOn the other hand, in places where it was not affected much by the front, the heat has returned, and
Until yesterday, there have been no hot spots above 35 C for the third day in a row, but
Today is likely to be a hot day for the first time in four days.

In addition, the Pacific high pressure will cover the area around Honshu until mid-next week, so
Choice is expected to continue to remain high.



However, after the front passes from Wednesday the 17th to Thursday the 18th, the air will be replaced by autumn air, and from Friday the 19th, there will be fewer days in northern and eastern Japan where the highest temperatures exceed 30c.

This year, the autumn equinox will be Tuesday, September 23rd, and
The beginning of the equinox will be Saturday, September 20th.

There is a saying that "The heat and cold are all the way to the equinox," but north of Kanto it seems that you can feel the signs of autumn a little earlier than the equinox.

Wild west of Tokai, the temperature rises to around 30 C even after the "Entry to Egan," but there will be fewer days when the heat is extremely hot and above
35 C.

Linear precipitation zones may occur in northern Kyushu; heavy rain warnings are being wary, mainly on the Sea of ??Japan side.

2025/09/14 06:02

There is a cyclone in the Hokkaido region, and it is developing, moving northeast, and a front extending from the cyclone is spreading from northern Japan to the Tsushima Strait.
Due to the influence of warm, humid air heading towards the front, the atmosphere condition has become very unstable in northern and western Japan, and there are some areas where extremely heavy rain is falling with lightning.
As of 6:00 on the 14th, heavy rain warnings and flood warnings have been issued in Hokkaido, Ishikawa Prefecture, Toyama Prefecture, Shimane Prefecture, Fukuoka Prefecture, and Nagasaki Prefecture.



In the future, the low pressure system is expected to move towards the seas near the Kuril Islands through the evening of the 14th, and as a result, the
front is expected to move south. The atmosphere will become extremely unstable, from north to western Japan to western Japan, and the atmosphere will become very unstable, with extremely heavy rain falling, and heavy rain is expected.



[Rain Prediction]
The 24-hour precipitation expected to be high from 6am on the 14th to 6am on the 15th is
+Tohoku region 60mm
+Hokuriku region 80mm
+Chugoku region 80mm
+Northern Kyushu region 100mm




/B. If a linear precipitation occurs, there is a risk that the rainfall will increase locally even further.

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

Beware and beware of heavy rain with lightning over a wide area. Linear precipitation zones may occur in Hokkaido.

2025/09/13 17:29

There is a low pressure system in the Sea of Japan, and it travels northeast, with the front passing through the Tohoku region and the Sea of Japan and the Korean Peninsula to the Yellow Sea.
Currently, warm and humid air has flowed into the front line in the vicinity of Japan, and from north to western Japan, the atmosphere is extremely unstable and extremely heavy rainfall with lightning.

As the low pressure system develops, it is expected to pass through the Hokkaido region tomorrow, Sunday the 14th, and the front will extend to the area around Honshu on the 14th.
In Northern Japan and Western Japan, the atmosphere is expected to remain extremely unstable due to the effects of low pressure and warm, humid air heading towards the front from tomorrow, the 14th.



In the Hokkaido region, linear precipitation zones can occur from the beginning of the night of the 13th to the dawn of the 14th, causing the risk of heavy rain disasters to rise dramatically.
Please be very careful of landslides, flooding of low land, flooding of rivers and flooding.
Also, from the 14th in northern Japan to western Japan, be careful of heavy rain, and be careful of severe gusts of wind, such as lightning strikes and tornadoes, and hail fall.





###Rain forecast
In the north to western Japan, there will be very heavy rainfall from the 14th, with some areas causing heavy rain.
There are some areas where the ground has been loosened due to rainfall so even small amounts of rain can increase the risk of landslides.

The expected one-hour precipitation from the 13th to the 14th is high, with
Hokkaido, northern part of the Sea of Japan side of 50mm.
Hokkaido, southern part of the Sea of Japan side: 50mm.
Hokkaido, western Pacific side: 50mm.
Hokkaido, Eastern Pacific Ocean: 30mm.
Hokkaido, Northern part of the Sea of Okhotsk side: 40mm.
Hokkaido, southern part of the Sea of Okhotsk side 40mm.
Tohoku: Sea of Japan Side: 50mm.
Tohoku Pacific side 40mm.
Northern Kanto 20mm.
Southern Kanto: 30mm.
Koshin: 30mm.
Hokuriku: 50mm.
Tokai: 50mm.
Northern Kyushu: 50mm.

The 24-hour precipitation expected from 6pm on the 13th to 6pm on the 14th is high, with Hokkaido, northern part of the Sea of Japan side of the country 150mm.
Hokkaido, southern part of the Sea of Japan side: 180mm.
Hokkaido, western Pacific side: 180mm.
Hokkaido, Eastern Pacific Ocean: 100mm.
Hokkaido, Northern part of the Sea of Okhotsk side, 120mm.
Hokkaido, southern part of the Sea of Okhotsk side, 120mm.
Tohoku: Sea of Japan Side: 150mm.
Tohoku Pacific side 80mm.
Northern Kanto: 50mm.
Minami Kanto: 50mm.
Koshin 60mm.
Hokuriku: 120mm.
Tokai 120mm.
Northern Kyushu: 120mm.


If a linear precipitation occurs, there is a risk that the rainfall will increase locally even further.
The following are the areas and periods where linear precipitation zones can cause a sudden increase in the risk of heavy rain disasters.
Oshima/Hiyama region From the beginning of the evening of the 13th to the early hours of the 14th.
Ishikari, Sorachi, and Shimoshi regions, Iburi and Hidaka regions from late at night on the 13th to early dawn on the 14th.

###Wind forecast
Maximum wind speed expected from the 13th to the 14th (maximum instantaneous wind speed)
Hokkaido, Northern land on the Sea of Japan side: 20 meters (35 meters).
Hokkaido: Northern sea on the Sea of Japan side: 23 meters (35 meters).
Hokkaido, southern land on the Sea of Japan side: 18 meters (30 meters).
Hokkaido, southern seaside on the Sea of Japan side 20 meters (30 meters).
Hokkaido: Western Pacific Side Land and Field: 16 meters (30 meters).
Hokkaido: Western Pacific Ocean: 20 meters (30 meters).
Hokkaido, Eastern Pacific Side Land and Field: 16 meters (30 meters).
Hokkaido, Eastern Pacific Ocean side sea: 23 meters (35 meters).
Hokkaido, 20 meters (35 meters) on the northern side of the Sea of Okhotsk side.
Hokkaido, 23 meters (35 meters) above the sea on the northern side of the Sea of Okhotsk.
Hokkaido, 16 meters (30 meters) on the southern side of the Sea of Okhotsk side.
Hokkaido, southern seaside on the Sea of Okhotsk side, 23 meters (35 meters).

###Disaster Prevention Issues
In the Hokkaido region, be careful of landslides, flooding of low land, rising rivers and overflowing on the 14th.
Please be careful and be careful of heavy rain in northern Japan and western Japan from the 14th.
Also, be careful of severe gusts of winds such as lightning strikes and tornadoes in northern and western Japan from the 14th.
If there are signs of developing cumulonimbus clouds approaching, try to ensure safety by moving inside the building.
There is a risk of hail falling, so please be careful when managing agricultural crops and agricultural facilities.

Typhoon No. 15 lands near Sukumo City, Kochi Prefecture; linear precipitation zones occurred in Miyazaki, Shizuoka, and Kanagawa prefectures, as well as tornadoes occur in Makinohara City, Shizuoka Prefecture and other areas (weather summary August 31st to September 6th, 2025)

2025/09/13 08:01

On September 4th, Typhoon No. 15 broke out in the waters near the Nansei Islands, and landed near Sukumo City, Kochi Prefecture in the early hours of the 5th. Typhoon No. 15 caused linear precipitation in Miyazaki, Shizuoka and Kanagawa prefectures, as well as gusts of wind that are considered to be tornadoes in Shizuoka and Ibaraki prefectures. According to a later investigation by the Japan Meteorological Agency, the tornado that occurred from Makinohara City, Shizuoka Prefecture to Ohata, Yoshida Town, was estimated to have reached an estimated wind speed of approximately 75 m/s, causing damage such as collapse of electric poles and total and half-destruction of over 1,000 homes.

Below is a summary of the weather for the current period (August 31st to September 6th).

#Summary of weather for this period (August 31st to September 6th)
Average temperatures have been much higher than normal nationwide due to low pressure and warm air flowing towards the front. In western and eastern Japan, the heat has continued throughout the country even in September, with many places exceeding 3 degrees Celsius or more than normal.

Precision amounts have been significantly higher than normal in the Pacific Ocean side of eastern Japan, from Akita, which had heavy rain due to the effects of fronts, and western Japan, which had heavy rain due to Typhoon No. 15. In Akita, Tokyo and Osaka, the amount of rainfall recorded more than twice the average year, and in Miyazaki, where a linear precipitation zone occurred, the amount of rainfall exceeded more than four times the average year.

Sunday hours were often sunny in western Japan, eastern Japan, Okinawa and Amami, where high pressure was likely to be covered by high pressure, making it more sunlight than usual. In particular, in Hokuriku, sunlight was much higher than usual in Niigata and Kanazawa. Meanwhile, Hokkaido was easily affected by low pressure and front lines, causing sunshine to fall below normal in Asahikawa and Abashiri.



[About the weather during this period]
#Characteristics of the atmospheric pressure system
On the 31st, the high pressure system, which is centered on the south of Japan, stagnated mostly. The front line near the Korean Peninsula gradually approaches northern Japan from China. On the 1st, a low pressure system appeared on the front in the central Japan Sea, and as it developed it approached the area around Hokkaido. Another low pressure system appeared on the front late at night near the Korean Peninsula. On the 2nd, the front line stagnated from the east of the Kurishima Island to the Sea of Japan to Hanachu, and two low-pressure pressure systems on the front line moved eastward. A new tropical cyclone emerges in the south of Okinawa. On the 3rd, the front gradually moved south from Tohoku to the area near Hokuriku, and from the continent, a mobile high pressure system advanced to the Sea of Japan. A tropical cyclone continued to move north in the south of Okinawa, and developed as Typhoon No. 15 around the early hours of the 4th. Typhoon No. 15 headed north near the Bungo Waterway on the 4th, and landed near Sukumo City, Kochi Prefecture in the early hours of the 5th. On the 5th, Typhoon No. 15 proceeded eastward along the southern coast of Honshu, and the front stagnated from Hokuriku to the south of Tohoku. Late on the 5th, Typhoon No. 15 transformed into a temperate cyclone over the Tokai region of Kanto. On the 6th, the area around Honshu was widely covered by mobile high pressure.

#Precture
On the 31st, high pressure was covered in the area around Honshu, but locally heavy rain was observed in Kyushu. On the 1st, heavy rain occurred in Hokkaido due to the influence of the front line, and the rain was heavily in Toi Tomari, Hakodate City, with a rainfall of 102mm per hour. On the 2nd, heavy rain began in Hokkaido, Tohoku, Hokuriku, and Sanin due to the effects of the warm, humid air heading towards the front. In Kitaakita City, daily rainfall was recorded at Hitari and Wakigami. On the 3rd, there was extremely heavy rain in Tohoku and Hokuriku due to the influence of the southbound front. In the Kanto region, rain clouds have suddenly developed due to warm and humid air and rising temperatures during the day, and record-breaking information on heavy rain has been announced in Ibaraki and Tochigi prefectures. On the 4th, heavy rain occurred in Kyushu and Shikoku due to the effects of Typhoon No. 15, and a linear precipitation zone occurred in Miyazaki Prefecture. Heavy rain was also occurring in the Kanto region, far from the typhoon, and record-breaking short-term heavy rain information was released in Chiba Prefecture and Tokyo. On the 5th, heavy rain occurred on the western and eastern Pacific sides of Japan due to the effects of Typhoon No. 15. Linear precipitation zones occurred in Shizuoka and Kanagawa prefectures. In addition, severe gusts of wind that were believed to be a tornado occurred in Makinohara City, Shizuoka Prefecture and Omika Town, Hitachi City, Ibaraki Prefecture due to the effects of Typhoon No. 15.

#Temperature
On the 31st, the area around Honshu is within the high pressure zone, and the heat is especially severe in the Tokai region. Nagoya has observed 40.0 C for the second time since statistics began. On the 1st, western and eastern Japan were covered by a wide range of high pressures, and temperatures rose due to strong sunlight. In Toyama, the temperature was high due to the Fohn phenomenon, causing a severe hot day of 38.0 C. On the 2nd, the temperatures increased inland areas of Kanto. The temperature was observed at 39.8 C in Hatoyama, Saitama Prefecture, and the number one value for September was updated. On the 3rd, temperatures rose, mainly in the western and eastern Pacific sides, and many hot spots began to rise. It was a severe 38.5c in Katsunuma, Koshu City, Yamanashi Prefecture, and Nagoya (37.5c) was a 20th consecutive day of extreme heat. On the 4th, the extreme heat in western and eastern Japan was subsided due to the effects of rain, with the highest temperature in Tokyo remaining at 28.7c and 32.8c in Nagoya. Sakaiminato City, Tottori Prefecture (35.0c), recorded the only day of the day's extreme heat. On the 5th, Typhoon No. 15 left in Kyushu and Shikoku, and the sun was restored, causing extreme heat in Miyazaki (36.4c) and Kochi (36.2c). On the 6th, a typhoon passed, and sunlight reached various places, causing temperatures to rise, mainly in western Japan. Yamaguchi recorded a temperature of 36.9 C, breaking the top spot in September.