Today, the 22nd (Wednesday), it is extremely hot in Kyushu and southern Tohoku, and there is a risk of a ``severely hot day'' with temperatures exceeding 40c in the Tokai and Kanto regions.

2026/07/22 07:25

Today, the 22nd (Wednesday), summer skies will spread across western and eastern Japan, making it extremely hot. Temperatures will rise especially in the inland areas of the Tokai and Kanto regions, and there is a risk that the Tokai region will experience consecutive days of extreme heat. The highest level of vigilance is required to prevent heat stroke.



The Pacific anticyclone continues to be centered over the sea south of Honshu and widely covers western and eastern Japan. Summer skies are expected to spread out in the morning, and temperatures are expected to rise rapidly.



It will be an extremely hot day with temperatures exceeding 35 degrees Celsius mainly in inland areas, and maximum temperatures of 40 degrees Celsius are expected in Nagoya City and Kumagaya City, Saitama Prefecture. In the Tokai and Kanto inland areas, there is a risk of extremely hot days with temperatures exceeding 40 degrees Celsius, so extreme vigilance is required to prevent heat stroke. Please take all possible precautions, such as refraining from going out when the temperature is high, and use the air conditioner appropriately when indoors.

In addition, the Ministry of the Environment has issued
heatstroke warning alerts for 41 prefectures from Fukushima to Okinawa.



The risk of heatstroke is particularly high in the target areas. Please take proactive steps to prevent heat stroke, such as staying hydrated frequently and avoiding prolonged outdoor activities and using the air conditioner indoors.

*Announcement status of heatstroke warning alert (total of 41 prefectures and forecast areas)
Fukushima prefecture, Ibaraki prefecture, Tochigi prefecture, Gunma prefecture, Saitama prefecture, Tokyo (Tokyo region), Chiba prefecture, Kami Nagawa, Nagano, Yamanashi, Shizuoka, Aichi, Gifu, Mie, Niigata, Toyama, Ishikawa, Fukui, Shiga, Kyoto, Osaka, Hyogo, Nara, Wakayama, Oka Yamagata, Hiroshima, Shimane, Tottori, Tokushima, Kagawa, Ehime, Kochi, Yamaguchi, Fukuoka, Oita, Nagasaki, Saga, Kumamoto, Miyazaki, Kagoshima (excluding Amami region) ), Daitojima region, Okinawa Prefecture

In the areas covered by the heatstroke warning alert, not only the temperature but also the heat index (WBGT) will rise, increasing the risk of heatstroke. Please take precautions such as turning on the air conditioner and frequently drinking water and salt.



In the Ministry of the Environment's "Heatstroke Prevention Information Site," information on the risk of heatstroke (heatstroke warning alert) is updated daily.
Please check the alert level in your area and act accordingly.

Summary of weather and temperature (7/12 to 7/18) After the rainy season, it is extremely hot in western Japan. Heavy rain is expected in some places in eastern and northern Japan due to humid air and the low pressure caused by former Typhoon No. 9.

2026/07/22 06:54

This is a summary of the weather and temperature from 7/12 to 7/18.



#Characteristics of pressure distribution
On the 12th, Typhoon No. 9 made landfall in China and moved northward. Western and eastern Japan were in an area of high pressure, but in northern Japan, moist air flowing around the edge of the high pressure system caused atmospheric conditions to become unstable. On the 13th, Typhoon No. 9 weakened as it moved northward through central China. Western Japan was in a high-pressure area, but eastern and northern Japan were in a low-pressure trough, and a low-pressure system formed off the coast of Sanriku and moved northward. On the 14th, Typhoon No. 9 moved northeast near the Yellow Sea, accompanied by a front. Western and eastern Japan were in a high-pressure zone, but northern Japan continued to experience a trough in atmospheric pressure. On the 15th, Typhoon No. 9 turned into an extratropical cyclone in the western Japan Sea and moved northward along the Japan Sea, accompanied by a front. The area from the Nansei Islands to western Japan was placed within the Pacific anticyclone. On the 16th, a front extending from a low pressure system different from Typhoon No. 9 passed near northern Japan. Western Japan is in an area of high pressure, but eastern and northern Japan are in a trough of weak atmospheric pressure. On the 17th, a front extended from central China to the vicinity of the Korean Peninsula, and the area around Japan became a trough of weak atmospheric pressure. On the 18th, a low pressure system formed above the front extending near the Korean Peninsula and moved eastward.

#Precipitation
On the 12th, there were record-breaking heavy rains in some places in Hokkaido due to the influence of moist air circulating around the edge of a high-pressure system.In the vicinity of Rikubetsu Town in Hokkaido, extremely heavy rain of 71mm per hour was observed, making it the heaviest rain in recorded history. On the 13th, the atmospheric conditions were unstable in various places due to the influence of humid air, and heavy rain was observed in various places in the southern Tohoku region. Humid air continued to flow into northern Japan on the 14th, causing unstable atmospheric conditions. Extremely heavy rain of 51.5 mm per hour occurred in Engaru Town, Hokkaido, the highest amount of rainfall in recorded history. On the 15th, a low-pressure system different from Typhoon No. 9 approached northern Japan, causing heavy rain mainly in Akita Prefecture, with 39 mm of rainfall recorded in one hour in Happo Town, Akita Prefecture. On the 16th, atmospheric conditions were unstable mainly in eastern Japan due to lower-level warm, humid currents and sunlight. In Konosu City, Saitama Prefecture, extremely heavy rain of 50mm per hour was observed. On the 17th, thunderstorms occurred mainly in the Kanto region due to the damp air. Extremely heavy rain of 72.5 mm in 1 hour in Kiryu City, Gunma Prefecture. On the 18th, there was heavy rain in Gunma and Tochigi prefectures from the night of the 17th until dawn. Ashikaga City recorded 237.5mm of daily precipitation, the highest in July.

#Temperature
On the 12th, temperatures rose mainly in western Japan, which was covered by the Pacific anticyclone. Due to the combination of warm air in the sky and strong sunlight during the day, dangerously hot temperatures were observed in Kyushu and the Sanin area, with temperatures reaching 38.3 degrees Celsius in Hita City, Oita Prefecture. On the 13th, the weather remained sunny and extremely hot, mainly in western Japan, with a temperature of 38.4 C observed in Nakamura, Shimanto City, Kochi Prefecture. In addition, Miyazaki City, Takamatsu City, Tokushima City, and Okayama City experienced their first extremely hot day of the year. On the 14th, warm air of 850hpa and 21c flowed into western and eastern Japan, and the temperature reached 38.3c in Tenryu Ward, Hamamatsu City, Shizuoka Prefecture. On the 15th, warm air moved north to the southern Tohoku region. In Minami-Shinano, Iida City, Nagano Prefecture, more than 150 locations had extremely hot days with temperatures of 38.1 degrees Celsius. Warm air continued to flow in on the 16th, and temperatures of 38.6 C were observed in Kuwana City, Mie Prefecture. The severe heat continued on the 17th, mainly in western Japan, with a temperature of 38.0c observed in Kyoto City. On the 18th, temperatures rose mainly on the Sea of Japan side where there was sunshine and wind blowing, with temperatures reaching 37.9 C in Sakai City, Fukui Prefecture and 37.8 C in Fukuchiyama City, Kyoto Prefecture, with severe heat continuing mainly in western Japan.



# Weather summary for this period (July 12th to July 18th)
The average temperature was in many places covered by high pressure, mainly in western Japan. In addition, warm air with a temperature of 850 hpa and 18 to 21 degrees Celsius flowed into the skies above Honshu, causing temperatures to rise and become higher or significantly higher than normal across the country.
The rainy season has ended in western Japan, where sunny weather continues, and in many places the precipitation was much lower than normal, with some places receiving 0 mm of precipitation. In eastern and northern Japan, many places experienced near-normal or above-normal weather conditions due to the influence of humid air, fronts, and low-pressure systems.
As for the number of hours of sunshine, the rainy season has ended in western Japan, where sunny weather continues, and the number of hours of sunshine has increased in some places to a greater extent than in normal years. In many places in eastern and northern Japan, sunshine hours were at or below normal due to the influence of humid air and the rainy season front.

Hachiman, Gujo City, Gifu Prefecture, Tajimi City, and Toyota City, Aichi Prefecture recorded "extremely hot days" with temperatures of 40 degrees Celsius or higher. Tomorrow, the 22nd (Wednesday), is also likely to be dangerously hot with temperatures approaching 40 degrees Celsius.

2026/07/21 18:13

Today, the 21st (Tuesday) around 2:00 p.m., AMeDAS observation in Hachiman, Gujo City, Gifu Prefecture, recorded a temperature of 40.0c (newest in observation history), marking the first "extremely hot day" of the year. This is the first time since the Japan Meteorological Agency designated days with maximum temperatures of 40 degrees Celsius or higher as "extremely hot days."
Additionally, at 2:09 p.m., AMeDAS observation in Tajimi City, Gifu Prefecture recorded a temperature of 40.3c, and at 3:12 p.m., 40.1c was observed in Toyota City, Aichi Prefecture. This means that "extremely hot days" were recorded at multiple locations in the Tokai region.



In the ranking of daily maximum temperatures, the top 10 locations recorded temperatures of 39c or higher. As of 5 p.m. today, the 21st, 277 sites experienced extreme heat, making it a record-breaking heat wave.

In major cities, Sendai, Tokyo, Nagoya, Osaka, and Fukuoka recorded extremely hot days with temperatures of 35c or higher, and Nagoya's temperature was the highest in July. Tokyo experienced its first extremely hot day of the year yesterday, the 20th (Monday), and the temperature rose to 36.6c around noon, making it the second consecutive extremely hot day.

#Maximum temperature in major cities
Sapporo 30.7c
*Sendai 35.6c
*Tokyo 36.4c
*Nagoya 39.7c (updated July's No. 1 value)
*Osaka 37.1c
Fukuoka 35.3c
Naha 32.7c
*:Highest temperature recorded this year



Tomorrow, the 22nd (Wednesday), the hot air of midsummer will remain in the skies over western and eastern Japan.
Looking at the minimum temperature on the morning of tomorrow, the 22nd, it is expected to be a tropical night that will not drop below 25 degrees Celsius in many areas. The expected maximum temperature during the day is 40c in Nagoya and Kumagaya (Saitama Prefecture), 39c in Maebashi and Gifu, and many places in western and eastern Japan will have temperatures above 35c.
Please be on guard against heatstroke day and night, and take all necessary measures such as drinking plenty of water, supplementing with salt, and taking adequate breaks.

High probability of lightning forecast in western and eastern Japan; be careful of sudden changes in weather from the afternoon

2026/07/21 13:33

Today, the 21st (Tuesday), atmospheric conditions have become unstable mainly in inland areas and mountains near Honshu due to rising temperatures during the day and moist air.



Looking at the rain cloud radar at 1 p.m., there are scattered rain clouds (indicated by the red radar) in the inland and mountainous areas from Tohoku to Chugoku and Shikoku. Although the range of rain clouds is narrow and localized, there are some places where there are sudden rain and thunderstorms, as seen in AMeDAS observation at 1 pm in Ogouchi, Okutama Town, Tokyo, where moderately heavy rain of 11.0 mm/h was observed.

From the afternoon of today, the 21st, rain clouds and thunderclouds are particularly likely to develop, especially inland and along the mountains. Looking at the predicted probability of lightning, the probability is high in a wide area from southern Tohoku to Kyushu, and there are areas in particular in the northern Kanto and Koshin regions where the probability is over 90%, so we need to be careful about sudden changes in the weather.
Please be careful as sudden rain or thunderstorms can cause rivers to rise in a short period of time and roads to flood. Also, be careful of landslides, lightning strikes, strong gusts of wind, etc. caused by tornadoes. If you see signs of a sudden change in weather, such as seeing black clouds or hearing thunder, please take precautions such as evacuating to a sturdy building.

Dangerous heat that exceeds body temperature - 40 degrees Celsius expected in Kumagaya; heatstroke warning alert the highest this season

2026/07/21 06:51

Today, the 21st (Tuesday), strong sunlight is expected to shine over a wide area due to the Pacific anticyclone covering eastern and western Japan. Extremely hot days with maximum temperatures of 35 degrees Celsius or higher are expected in various places from the southern Tohoku region to Kyushu, and dangerously hot days approaching 40 degrees Celsius are expected in inland areas. In particular, Kumagaya City, Saitama Prefecture, is predicted to have a maximum temperature of 40 degrees Celsius, which could be the first "extremely hot day" of the year. Even in central Tokyo, the weather is expected to be extremely hot, with temperatures expected to reach 36 degrees Celsius. Please take all possible measures to prevent heat stroke.

The predicted maximum temperature in each region is Sapporo 29c, Sendai 34c, Tokyo 36c, Kanazawa 34c, Nagoya 39c, Osaka 37c, Kochi 35c, and Fukuoka 33c.



The Ministry of the Environment and the Japan Meteorological Agency have issued heat stroke warning alerts from Tohoku to Okinawa, targeting 44 areas in 42 prefectures, the highest number this season. This will also be the first announcement of this year in Gifu and Osaka prefectures.

#Heatstroke Warning Alert Announcement Target Areas
Miyagi Prefecture, Fukushima Prefecture, Ibaraki Prefecture, Tochigi Prefecture, Gunma Prefecture, Saitama Prefecture, Tokyo, Chiba Prefecture, Kanagawa Prefecture, Nagano Prefecture, Yamanashi Prefecture, Shizuoka Prefecture, Aichi Prefecture Prefectures: Gifu, Mie, Niigata, Toyama, Ishikawa, Fukui, Shiga, Kyoto, Osaka, Hyogo, Nara, Wakayama, Okayama, Hiroshima, Shimane, Tottori, Tokushima, Kagawa, Ai Hime prefecture, Kochi prefecture, Yamaguchi prefecture, Fukuoka prefecture, Oita prefecture, Nagasaki prefecture, Saga prefecture, Kumamoto prefecture, Miyazaki prefecture, Kagoshima prefecture (excluding Amami region), Okinawa prefecture (Okinawa main island region), Okinawa prefecture (Daitojima region), Okinawa prefecture (Yae) Mountain regions)

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, please use the air conditioner as appropriate to stay indoors in a cool environment, and take precautions against heatstroke indoors.

Today's 21st (Tuesday) weather: Sunny and dangerously hot from eastern to western Japan. Heat stroke warning

2026/07/21 06:22

The rainy season front is expected to remain in Tohoku today, the 21st (Tuesday), after the holidays. On the other hand, eastern and western Japan will be covered by the Pacific anticyclone and will be exposed to strong sunlight.



There are times when clouds spread in Hokkaido, but most of the time it will be sunny. There is a possibility of showers in parts of the Pacific Ocean in the afternoon, so it's a good idea to bring a foldable umbrella.
In the northern part of Tohoku, clouds tend to spread, and there are likely to be some places where it will rain. It will be safe to have rain gear when going out.

From the southern Tohoku region to Kyushu, there are many places where the sun reaches, and the intense heat continues. The maximum temperature in many places will exceed 35 degrees Celsius, and it is expected to be dangerously hot, exceeding body temperature. Be careful not only of outdoor heatstroke but also of heatstroke indoors.
In addition, as temperatures rise, rain clouds are expected to develop locally in the afternoon, mainly along the mountains and inland. You also need to pay attention to changes in the sky.

Tomorrow, the 21st (Tuesday), there is a risk of disaster-level heat in the Tokai and Kanto regions; 40 degrees Celsius expected in Kumagaya. Will this be the first extremely hot day of the year

2026/07/20 18:39

Tomorrow, the 21st (Tuesday) after the holidays, the Pacific anticyclone will become even stronger, so the intense heat is likely to continue mainly in the Tokai and Kanto regions.



In particular, Kumagaya City, Saitama Prefecture, is expected to experience intense heat of 40 degrees Celsius. This will be the first time this year that we have had such a hot day nationwide. Temperatures in Nagoya and Gifu are also expected to reach 39 degrees Celsius, which is just one step away from an extremely hot day.



The severe heat continues in Western Japan, with temperatures in places like Kyoto and Okayama likely to reach 37 degrees Celsius, exceeding body temperature.



A [Heatstroke Warning Alert] has been issued widely for tomorrow, mainly in Kyushu and southern Tohoku.
Please be extremely careful about heatstroke day and night, drink plenty of water and salt, and use air conditioning even at night to prevent heatstroke.




The Ministry of the Environment's "Heatstroke Prevention Information Site" updates information on the risk of heatstroke (Heatstroke Warning Alert) on a daily basis.
Please check the alert level in your area and act accordingly.

Also, the heat level has risen a notch this week, and the disaster-level heat is expected to continue from tomorrow onwards. Avoid going out in strong sunlight as much as possible and try to stay in a cool place.

A series of extremely hot days: Central Tokyo records its first extremely hot day of the year

2026/07/20 16:58

Today, the 20th (Monday), many areas around Honshu were covered in high pressure and were sunny, with strong sunlight shining down and making it extremely hot.



In the inland areas of eastern and western Japan, there are many places where the heat is dangerously high, exceeding body temperature. As of 3:20 p.m., the daily maximum temperature was 39.4c in Katsunuma, Koshu City, Yamanashi Prefecture, 38.6c in Toyota City, Aichi Prefecture, and 38.5c in Hatoyama, Saitama Prefecture. It was extremely hot, with temperatures exceeding 38 degrees Celsius in the top 10 locations with the highest daily temperatures.
As of 3 p.m. today, the 20th, the number of locations that have recorded extremely hot days of 35 C or higher is 243. In central Tokyo, AMeDAS observations have observed temperatures of 35 C or higher, marking the first extremely hot day of the year. As of 3:10 pm on the 20th, the highest temperature in Tokyo has reached 36.1c.



Tomorrow, the 21st (Tuesday), will have a similar atmospheric pressure distribution as today, the 20th (Monday). It is likely that there will be some rain on the Sea of Japan side of northern Japan, where the front is stationary, but areas from the southern Tohoku region to Kyushu and the Nansei Islands will be covered by a midsummer high-pressure system, and the maximum daytime temperature will likely rise to around 35c in many places. Inland, there are likely to be places where the heat is dangerously close to body temperature. Kumagaya City in Saitama Prefecture and Nagoya are expected to experience 39 degrees Celsius, while Maebashi, Kofu, Gifu and other areas are expected to experience 38 degrees Celsius.

Please continue to be extremely careful about heat stroke, drink plenty of water and salt, and take adequate breaks.

The end of the rainy season has been announced in the Tokai and Kanto regions. The severe heat will continue day after day, and there is a warning for heat stroke.

2026/07/20 12:21

On Monday, the 20th, Marine Day, the Japan Meteorological Agency announced that the rainy season appears to have ended in the Tokai and Kanto-Koshin regions.



The rainy season ended one day later than normal in the Kanto-Koshin region, and 22 days later than last year. In the Tokai region, the end of the rainy season was announced one day later than normal and 23 days later than last year.

*The rainy season is a seasonal phenomenon, and there is an average "transition" period of about 5 days between the start and end of the rainy season. In addition, the announcement of the start and end of the rainy season is preliminary information, and will be reconsidered in consideration of weather changes from spring to summer, and may be revised at a later date.



From now on, the area around Honshu will be covered in high pressure for many days, and the severe heat is expected to continue day after day, especially in eastern and western Japan. The temperature will not drop much at night, and the night will continue to be tropical.
From tomorrow, the 21st (Tuesday) after the holidays, the predicted maximum temperature in Tokyo will be 35 degrees Celsius or higher every day, and in Nagoya, the 22nd (Wednesday) and 23rd (Thursday) may be extremely hot days of 40 degrees Celsius.

Please be extremely careful about heatstroke day and night, drink plenty of water and salt, and use air conditioning even at night to prevent heatstroke.

Beware of sudden changes in weather in eastern and western Japan today, the 20th (Monday/Marine Day). There is a risk of thunderstorms mainly along the mountains in the afternoon.

2026/07/20 07:40

Today, the 20th (Monday/Marine Day), many parts of eastern and western Japan are expected to be covered in high pressure and be mostly sunny, but in the afternoon, people should be careful of sudden thunderstorms especially along the mountains.
When going out, please bring rain gear and pay attention to changes in the sky, especially if you are planning to take part in outdoor leisure activities.



Looking at the weather forecast at 6:00 pm today, it is predicted that it will be mostly sunny in eastern and western Japan, but that it will rain in places, mainly along the mountains.



Looking at the probability of a lightning strike at 6pm today, the probability of a lightning strike is high mainly along the mountains of eastern and western Japan.

Due to the rise in daytime temperatures and the influence of warm, humid air flowing in from the south, the atmospheric conditions will become unstable in the afternoon, leading to localized heavy rain with thunderstorms.
Please be careful of flooding of low-lying land, rising river water, and landslides. Also, be careful of gusts of wind such as lightning and tornadoes.
Please be aware of changes in the sky, and if there are signs of a developing cumulonimbus cloud approaching, please take precautions such as moving inside a building.