Weather for the week: Rainy skies in the Tohoku region. Be careful of dangerous heat and sudden rain in eastern and western Japan.

2026/07/20 04:13

The weather for the next week is expected to continue to be cloudy and rainy in the Tohoku region due to the influence of the seasonal rain front, while eastern and western Japan are expected to have many sunny days.
However, even if the weather is sunny, there is a possibility of rain showers mainly along the mountains due to rising daytime temperatures and warm, humid air flowing in from the south. Please be careful of sudden changes in the weather.



This week, the rainy season front is expected to stay near the northern part of Tohoku. There will be many rainy days, especially in the northern Tohoku region.
During the weekend from the 25th (Saturday) to the 26th (Sunday), a frontal low pressure system is expected to move eastward near Tohoku, so rain will spread over the Tohoku and Hokuriku regions.

Hokkaido has many cloudy and sunny days.
Eastern and western Japan will have many sunny days covered by high pressure from the south.
However, local atmospheric conditions may become unstable due to rising daytime temperatures and warm, humid air flowing in from the south. Even if it is sunny, there is a possibility of thunderstorms in the afternoon, mainly along the mountains. Please be careful of sudden changes in the weather.

If you notice that pitch black clouds are approaching, you hear thunder, or suddenly a cold wind is blowing, move into a sturdy building.
Heavy rain brought by well-developed cumulonimbus clouds can fall heavily over a small area in a short period of time. Be careful of lightning strikes, gusts of wind such as tornadoes, rising river waters, and flooding of low-lying areas.




Over the next week, temperatures are expected to be higher than normal in many places in northern and western Japan. It is predicted that a wide area of Kanto-Koshin, Tokai, and western Japan, including Tokyo, will experience extremely hot days with temperatures exceeding 35 degrees Celsius every day, while Nagoya is expected to experience extreme heat of 40 degrees Celsius from the 22nd to the 23rd.

Please take steps to prevent heat stroke, such as hydrating frequently, adding an appropriate amount of salt, and using a parasol or hat when outdoors. Since there are many places where the temperature is over 25 degrees Celsius in the tropics, make sure to use the air conditioner properly indoors even at night and don't overdo it.
Also, please check the heatstroke warnings issued jointly by the Japan Meteorological Agency and the Ministry of the Environment, and consider refraining from outdoor activities on the days when they are issued in your area.

The rainy season will soon end in the Kanto and Tokai regions. After the rainy season ends, temperatures in Nagoya are feared to reach 40 degrees Celsius. Be on high alert for heat stroke!

2026/07/19 12:44

From now on, the seasonal rain front will remain stationary near northern Japan, and western and eastern Japan will be covered by the summer high pressure system from the south. Even in the Tokai and Kanto regions, where the end of the rainy season has not yet been announced, the sun is expected to continue to shine from tomorrow, the 20th (Monday, holiday) onwards.



Today, the 19th (Sunday), clouds will likely spread, and there will be some places where it will rain mainly in the afternoon. In the Tokai and Kanto regions, the rainy season is likely to end as early as tomorrow the 20th (Monday, holiday).
On the other hand, Hokuriku and Tohoku are expected to have many cloudy days due to the influence of the front. Therefore, the end of the rainy season in Hokuriku and Tohoku may still be some way off.

The end of the week is likely to be extremely hot due to warm air and sunshine, especially in the Tokai and Kanto regions, where the end of the rainy season is approaching. In Nagoya, temperatures are expected to reach 40 degrees Celsius from the 22nd (Wednesday) to the 23rd (Thursday), which could be the first extremely hot day of the year.



Let's take precautions against heat stroke more than ever.
Please be sure to drink plenty of water, take adequate amounts of salt, and avoid going out during hot hours as much as possible and stay in a cool environment.



On 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.

There is a risk of sudden changes in the weather today. Be careful of thunderstorms when enjoying outdoor leisure activities.

2026/07/19 08:19

A low pressure system accompanied by a front is moving northeast west of Hokkaido, and warm, humid air is flowing toward this low pressure system.



Heavy rain has been observed in Hokkaido and Aomori prefectures near the low pressure system.
Currently, a level 4 landslide warning has been issued for Mutsu City and Sotogahama Town in Aomori Prefecture. Everyone should evacuate from dangerous cliffs and slopes.

Eastern and western Japan will have periods of sunshine, and daytime temperatures are expected to be higher than normal.
As a result of these effects, the atmospheric conditions in eastern and western Japan, which are south of the front, will become extremely unstable, and there is a risk that localized rain clouds will develop and cause heavy rain accompanied by thunder.



Eastern and western Japan are covered in humid summer air, so if active rain clouds stay in the same area, there is a possibility of warning-level heavy rain.
The ground has become loose in some places due to previous rains, so please be careful of landslides, flooding of low-lying areas, and sudden rises in rivers.

Many people are probably planning to spend the three-day weekend outdoors, such as in the mountains or at the river.



If there are signs such as sudden darkness in the area or cold wind blowing, it is a sign that cumulonimbus clouds are approaching. Please evacuate to a safe building.

Severe heat continues nationwide; high temperature warning issued in eastern and western Japan

2026/07/19 04:09

According to the general weather commentary provided by the Japan Meteorological Agency, there will be days when the area is covered by high pressure and warm air, so temperatures are expected to remain high across the country.
The temperature is expected to reach over 35 degrees Celsius in some places, so please take care of your health and avoid heat stroke.



# Period when you need to be careful about high temperatures
Eastern Japan: Around the 20th to 24th
Western Japan: Around the 24th

The Ministry of the Environment's "Heatstroke Prevention Information Site" updates information on the risk of heatstroke every day. Please check the alert level in your area and act accordingly.

[3-day weekend weather] Front and low pressure system approaching Hokkaido, 150mm of rain expected in one day, risk of warning-level heavy rain

2026/07/18 12:09

Over the three-day weekend, there is a risk of warning-level heavy rain in Hokkaido due to the influence of fronts and low pressure.
Today, the 18th (Saturday), a front is extending from the continent, through the Yellow Sea, the Korean Peninsula, and into the Sea of Japan, and the low pressure above the front is moving eastward through the Yellow Sea.
The front will extend near Hokkaido on the night of the 19th (Sunday) tomorrow, and a new low pressure system that has formed above the front will move toward the Oshima Peninsula.



Atmospheric conditions are expected to be unstable in Hokkaido as warm, humid air will flow in toward the low pressure system and front.
Heavy rain of up to 30mm per hour will fall locally on the Sea of Japan, Pacific Ocean, and Sea of Okhotsk sides during the three-day weekend from the night of today, the 18th (Saturday) to the 20th (Monday) the next day.
Heavy rain accompanied by intermittent thunderstorms is expected to occur, especially on the Sea of Japan and Pacific Ocean sides.



#Forecasted precipitation for 24 hours until the morning of tomorrow 19th (Sunday) [in areas with the most]
Northern Sea of Japan side 100mm
Southern Sea of Japan side 120mm
Western Pacific Ocean 150mm
Eastern Pacific Ocean 80mm

# Precipitation forecast for 24 hours from tomorrow until the morning of Monday 20th [in areas with the most]
Northern Sea of Japan 100mm
Southern Sea of Japan 100mm
Western Pacific 120mm
Eastern Pacific 100mm
Northern Sea of Okhotsk side 100mm



Please be careful of flooding of lowlands, rising river waters, and landslides due to heavy rain.
Depending on the degree of rain cloud development, there is a risk of heavy rain reaching warning level.
If you are planning a trip to Hokkaido for the 3-day weekend, please keep an eye on the latest information.

Three-day weekend weather: Hokkaido is at risk of heavy rain due to the path of a front and low pressure system; Western and eastern Japan should be careful of sudden weather changes and dangerous heat

2026/07/18 07:45

I think many people will have a three-day holiday from today, the 18th (Sat) to tomorrow, the 20th (Mon). During the three-day holiday period, there is a risk of warning-level heavy rain in Hokkaido and northern Tohoku.



Around Honshu, extremely warm and humid air flows in around the edge of the high pressure system in the south of Japan, making the atmospheric conditions unstable. Also, from the west, a front and a low pressure system above the front are expected to move near the Sea of Japan.
As warm, humid air flows towards the front and low pressure, the total rainfall will increase mainly in Hokkaido, which is the path of the front and low pressure, and there is a risk of warning-level heavy rain. Even in the northern Tohoku region, there are likely to be some places where there will be heavy rain accompanied by localized thunderstorms.
Please be careful of landslides, flooding of low-lying land, flooding of roads, rising water levels and flooding of rivers, and check the latest weather information that will be updated during the holidays.

From southern Tohoku to Kyushu, the effects of warm, humid air and rising daytime temperatures will likely lead to unstable skies, especially inland and along the mountains. Even in places where there is no umbrella symbol in the weather forecast, be careful of sudden rain or thunderstorms. In addition, due to heavy rains so far, the ground may be loose and rivers may be swollen in some places, so please continue to be careful of landslides, flooding of low-lying areas, and flooding of roads.
If you are planning to enjoy leisure activities in the mountains or rivers during the holidays, if you see black clouds or hear thunder, there is a high possibility that the weather will suddenly change, so please pay attention to changes in the sky and take precautions such as taking shelter in a sturdy building.

Also, be careful of the dangerous heat. In many places, it will be hotter than normal and the humidity will be high, making it feel humid in many places. Temperatures will not drop much during the day as well as at night, and many places in western and eastern Japan are expected to experience tropical nights. You need to be careful about heatstroke day and night, and please take all possible measures to prevent heatstroke, such as staying hydrated frequently and actively using the air conditioner even at night.

There is a fear that a linear rain band will form in southern Gunma Prefecture and southern Tochigi Prefecture within the next 3 hours, and the risk of heavy rain disasters will rapidly increase.

2026/07/17 22:34

At around 9:50 p.m. today, Friday, the 17th, the Japan Meteorological Agency announced a near-strike forecast for a linear precipitation band, targeting southern Tochigi and southern Gunma prefectures, stating that there is a risk that a linear precipitation band will form within the next three hours and extremely heavy rain will continue.

As of 10:00 pm on the 17th (Friday), well-developed rain clouds can be seen in places in the Kanto-Koshin region, and extremely well-developed rain clouds are hanging over the prefectural borders of Gunma, Tochigi, and Saitama prefectures in the northern Kanto region. At 9:40 p.m., heavy rain was observed in Kiryu City, Gunma Prefecture, with an hourly rainfall of 38.0 mm, and heavy rain was observed at multiple locations in Gunma Prefecture and Tochigi Prefecture.
Currently, there are places in Gunma and Tochigi prefectures where level 4 heavy rain danger warnings and landslide danger warnings have been announced.

If linear precipitation bands occur in the future, the risk of life-threatening heavy rain disasters will rapidly increase. Please be extremely cautious of landslides, flooding of low-lying areas, rising water levels and flooding of rivers, etc.

Please avoid approaching dangerous areas such as rivers and cliffs, and take appropriate evacuation actions in accordance with evacuation information issued by local governments. If it is difficult to evacuate, please try to ensure your safety by moving to a higher place such as the second floor of your home or higher.

Weather for tomorrow 18th (Saturday): Rainy holidays start in eastern and northern Japan

2026/07/17 17:34

A low pressure system accompanied by a front is expected to move through the Yellow Sea.



Tomorrow, the start of the three-day holiday, looks like the weather will not be refreshing in eastern and northern Japan.
A front extending from the Sea of Japan is expected to approach northern Japan. Rain will fall mainly on the Sea of Japan side of northern Japan, and the area of rain will gradually expand to the east. Localized heavy rain and thunderstorms are possible at night.
In eastern Japan, clouds are likely to spread, and there is a possibility of showers in places. Don't forget your umbrella when you go out. Even if there is little sunlight, the humidity is high and the weather is likely to be unpleasantly hot.
Western Japan has many areas that receive sunlight, and it continues to be extremely hot. In Kyushu, there are likely to be some extremely hot days with temperatures exceeding 35 degrees Celsius during the day. There is a chance of showers in the afternoon, mainly along the mountains.

[Kanto Level 4 Heavy Rain Danger Warning Announced] Be careful of sudden changes in weather even during the holidays! (Commentary: Weather forecaster Atsuko Miyake)

2026/07/17 15:04

The atmospheric conditions in the Kanto region have been unstable since this morning, with thunderstorms occurring here and there.



Looking at the state of the rain clouds at 2:00 p.m., active rain clouds are scattered here and there in the Kanto region, and lightning strikes have also been observed.

In Hachioji City, Tokyo, extremely heavy rain of 58.5mm was observed in the hour until 2pm.



As of 2:00 p.m., a level 4 heavy rain danger warning has been issued for Hachioji City in Tokyo, Matsudo City, Chiba Prefecture, Ichikawa City, Yokohama City, and Kawasaki City in Kanagawa Prefecture.
If you are in a dangerous place, please assess your surroundings and immediately evacuate to a safe place.

As the atmosphere continues to be unstable, please be careful of sudden changes in the weather, even in places where it is not raining right now.
Be careful of lightning, tornadoes, strong wind gusts, and hail.



Now, let's take a look at the forecast for rain clouds.
After this, rain and thunderstorms are expected to occur over a wide area.
Also, the wind that carries the rain clouds is weak today, so even if rain clouds form, there is a possibility that extremely heavy rain will continue to fall in similar areas.


After this, there is a possibility that rain will continue in similar places in the northern Kanto region, such as around Utsunomiya,
through the night.

Also, the date has changed and rain clouds will continue to remain from early morning to early morning tomorrow (Friday), and
there is a risk that it will continue to rain heavily in similar areas.



In urban areas, if it continues to rain in the same area, drainage may not be able to catch up and rainwater may flow into
underpasses.

Today, please stay away from underground facilities and other places where rainwater can easily enter.

Also, lightning strikes are occurring, so please move to a sturdy building to protect yourself.

For information such as when the rain clouds will leave, please check the latest information on the rain cloud radar.



I think many people will have a three-day weekend starting tomorrow the 18th (Saturday), but it seems that there are few days in the Kanto region that are tightly covered by high pressure even during the holidays.

Moist air flows towards the front in the Sea of Japan.
The Kanto region continues to be prone to clouds and rain clouds.

There will still be rain and thunderstorms in the plains, especially tomorrow the 18th (Saturday), so please bring rain gear when you go out.

In the latter half of the holidays, there will be periods of sunshine, but thunderstorms are more likely to occur along the mountains.
Please be careful of sudden changes in weather when enjoying leisure activities in the mountains and rivers.



In the Kanto region, it is likely to rain during the first half of the holidays.
On the 18th (Saturday), there will be rain and thunderstorms even in areas marked cloudy, so
Please be aware of sudden changes in the weather.

The latter half of the holidays is likely to be sunny in the southern Kanto region, but the temperature will rise as the second half progresses.
Please be careful of heat stroke.



Weekly forecast.
The Kanto region will be marked as sunny from now on.
The rainy season has not yet ended in the Kanto-Koshin region, but I think there will be an announcement about the end of the rainy season soon.
However, once the rainy season ends, the heat will increase even more.
Inland areas are expected to continue experiencing extremely hot days with temperatures above 35c starting from the middle of next week.
The temperature will be quite high. Please be even more careful about heatstroke than ever before.

[3-day weekend weather] Atmospheric instability - Be careful of sudden changes in leisure weather in mountains and rivers! Warning heavy rain in Hokkaido (Commentary: Weather forecaster Atsuko Miyake)

2026/07/17 13:54

Atmospheric conditions have been unstable since the morning of today, the 17th (Friday).
Looking at the state of the rain clouds at noon, there are heavy rain clouds scattered here and there from the Kanto region to the Tohoku region.



Lightning has also been observed in the central Kanto area.
After this, in the afternoon, there is a high probability of lightning occurring not only in the Kanto and Tohoku regions, but also around the Kyushu region.

Please be careful of sudden changes in the weather from now on, even in areas where the weather is sunny now.
Please be careful of sudden strong rain, lightning strikes, strong gusts of wind such as tornadoes, and hail.



This is the forecast for rain clouds after this.
Towards the evening, rain clouds are expected to develop not only along the mountains in the Kanto, Tohoku, and Kyushu regions, but also
on the plains.

The wind that carries the rain clouds is quite weak today, so once the rain clouds develop,
it is expected to continue raining in the same places.

Rain clouds will clear up in the Tohoku and Kyushu regions at night, but in the Kanto region, rain is expected to continue in similar areas into the night.



There is a risk of heavy rain and thunderstorms in similar areas into the early hours of tomorrow.
Please be careful about flooding of roads and low-lying land.




Also, I think many people will have a three-day weekend starting tomorrow the 18th (Saturday), but it seems like it will be difficult to have clear skies even during the holidays because of the high pressure.

There are fronts and low pressure systems in the Sea of Japan, and the area around Honshu is a path for moist air.
Tomorrow, the 18th (Saturday), there will be a lot of clouds, and there are likely to be showers and thunderstorms here and there.
Please bring rain gear when going out.

There is a risk of warning-level heavy rain in Hokkaido from the 19th (Sunday) to the 20th (Monday/Holiday) as the low-pressure front approaches.
In Hokkaido, the ground has become loose due to past rains, so please be careful and be on guard against landslides.



This is the weather during the 3-day holiday.
It continues to rain in Hokkaido during the holidays.
Please be careful of heavy rain, especially from the 19th to the 20th.
Also, it tends to rain more in Tohoku and Hokuriku during the first half of the holidays.

Toward the latter half of the holidays, there will be some sunny days in western and eastern Japan, but
thunderstorms are also likely to occur along the mountains, so
please be careful of sudden changes in the weather when enjoying leisure activities in the mountains and rivers.



Weekly forecast. Next week. The sunny mark stands out.

In eastern Japan, such as the Kanto-Koshin region, and in the Tohoku region,
there is no announcement yet that the rainy season will end, but it looks like the end of the rainy season will increase in many places next week.



It looks like it will be quite hot from the middle of next week.
``Early weather information regarding high temperatures'' has also been announced, and from around the 22nd (Wednesday), it is likely to be ``very high temperatures'' nationwide.

For this time of year. There is a risk that the temperature will reach a level that occurs only once every 10 years.
Raise your precautions next week by one step higher than your previous precautions against heat stroke.