[Heavy rain warning] Hokkaido will experience extremely heavy rain and thunderstorms starting tonight, with heavy rain continuing throughout the three-day weekend (Commentary: Weather forecaster Junko Miyake)

2026/07/15 14:40

In Hokkaido, there are likely to be warning-level heavy rains from the night of Wednesday the 15th to tomorrow the 16th (Thursday).



First, here is the weather map at 9 o'clock.
At 9 a.m. today, the 15th (Wednesday), Typhoon No. 9 changed into an extratropical cyclone in the Sea of Japan.
A low pressure system derived from this typhoon is expected to develop and approach Hokkaido tonight.

This cyclone was originally a typhoon, so it has very warm and humid air from the tropics.
The atmospheric conditions are likely to become extremely unstable due to the influence of this humid air.
It looks like the rain will become heavier in Hokkaido starting tonight.



Let's take a look at the rain clouds.
At around 9:00 p.m., rain clouds begin to roll in from the Oshima Peninsula.
By the time the date changes, active rain clouds are expected to form in southern Hokkaido.
It looks like the rain will become heavier in Sapporo as well.

In the early hours of tomorrow, there will be red signs near the Hidaka Mountains, indicating that there will be heavy rain locally, and in some cases there is a risk of very heavy rain.

Also, the rain peaks during the dark hours, so
try to sleep in a safe place tonight, on the second floor or above, away from cliffs.



Towards dawn tomorrow (Thursday), the rain clouds are expected to gradually move eastward and disappear.
The expected amount of rain by tomorrow morning is 120 mm in many parts of Hokkaido.

It will continue to rain after that, but it looks like it will stop in many places around noon tomorrow.



It looks like the dull weather will continue in Hokkaido.
Especially during the three-day weekend starting on the 18th, Hokkaido is likely to be in the path of a low pressure system or front.
It will continue to rain easily, so
Please be careful about the rain.



The rain that starts tonight will continue until tomorrow morning in many places.
The weather is likely to improve in many places from around noon tomorrow.
With the return of sunny skies, the temperature is expected to rise to 34c tomorrow in Obihiro.
The heat is just one step away from an extremely hot day. Please be careful about heat stroke.



Weekly forecast.
The day after tomorrow (Friday), the skies will return to normal.
Temperatures are rising, and there will be many midsummer days with temperatures above 30c.

The three-day weekend from the 18th (Sat.) to the 20th (Mon./Holiday) is likely to have many rainy days.
It rains widely, especially during the first half of the holidays.
The rain is getting heavier again and the risk of landslides is likely to increase.
Please be careful about how it rains.
It looks like the sunny skies will return once the holidays are over next week.

[First extremely hot day of the year] Be careful of the intense heat! Meanwhile, northern Japan is experiencing warning-level heavy rain (commentary: weather forecaster Atsuko Miyake)

2026/07/15 13:37

Typhoon No. 9 changed into an extratropical cyclone in the Sea of Japan at 9 a.m. today, Wednesday, the 15th.
A low pressure system derived from this typhoon is expected to develop and approach Hokkaido tonight.



A front extending from the low pressure area will also reach the Tohoku and Hokuriku regions, and
the rain will become heavier in northern Japan and Hokuriku from tonight.

This cyclone is originally a typhoon, so it has extremely warm and humid air from the tropics.
Atmospheric conditions are becoming unstable, and there are likely to be heavy rains in northern Japan.



Rain is forecast.
Tonight, active rain clouds will roll in from the Sea of Japan side of Hokkaido and Tohoku.
There are also yellow and red signs indicating that there is a risk of heavy or very heavy rain depending on the location.

There is a risk of heavy rain in northern Japan.
Also, there are some places where the rain will peak during the dark hours of the night.
We need to be careful about how it rains tonight.



The expected amount of rain by tomorrow (Thursday) morning is
120 mm in Hokkaido and Tohoku.

In northern Japan, the ground has become loose in some places due to previous rains, so
please be extremely cautious of landslides.

Tomorrow (Friday) morning, the rain will stop in many places, and
the weather is likely to improve in the afternoon.


As warm air flows from the south toward this low-pressure system in northern Japan,
western and eastern Japan will experience intense heat.



The predicted maximum temperature for today, the 15th (Thursday), is expected to be an extremely hot day of over 35 degrees Celsius in
western Japan, eastern Japan, and the southern part of Tohoku.

Temperatures are expected to reach 39 degrees Celsius, especially in Toyama, where temperatures are rising due to the Fohn phenomenon.
It looks like it will be so hot that it approaches a "severely hot day" with temperatures exceeding 40 degrees Celsius.

This year, the term ``extremely hot days'' has been officially called.
The first extremely hot days this year may occur today or tomorrow.
You need to be careful about the heat.



A heatstroke warning alert has been issued for today (Wednesday) widely from Kyushu to the southern part of Tohoku.

This heatstroke warning alert warns people that the heat is dangerous.
When a heatstroke warning alert is issued,
don't hold back on your air conditioner and use it as you please.

In principle, outdoor exercise is canceled.
Be sure to drink plenty of water before you get thirsty, and replenish salt when you sweat.
Also, elderly people and children are less likely to feel the heat, so please have an adult speak to them.



And the heat will continue tomorrow (Thursday) as well.
Towards tomorrow (Thursday), many places in western and eastern Japan will experience extreme heat of 35 degrees Celsius or higher.

Sendai is also expected to have temperatures of 35c tomorrow, which could be the first extremely hot day of the year.
Please continue to be careful of heatstroke
.

Tomorrow, the rain in northern Japan and Hokuriku will stop until noon, and
it looks like the sun will return in the afternoon.

Western and eastern Japan will be sunny tomorrow with strong sunlight.
Let's also take measures against UV rays.



I think many people have a three-day holiday starting from Saturday. However, during the three-day weekend, rain will continue mainly in northern Japan where low pressure systems and fronts will pass through.
This rain will continue to make it a bit hot and humid.
Please continue to be careful about heat stroke.

Warm and humid flow from typhoon inflows, leading to extremely heavy rain in Tohoku

2026/07/15 12:49

Typhoon No. 9 has turned into an extratropical cyclone and is moving east-northeast across the central Japan Sea.
This low pressure system is expected to move toward Sakhalin on the 16th (Thursday), and a front extending from there is expected to pass through the Tohoku region.



The warm, humid air from the tropics brought in by the low pressure system that was a typhoon is expected to flow toward the low pressure system and front, causing atmospheric conditions to become unstable.

Currently, there are clouds in Hokkaido, Tohoku, and Kyushu regions, and some places are experiencing rain.
It will be sunny today, mainly on the Pacific side, but as a low-pressure front moving through the Sea of Japan approaches, the weather will deteriorate from the Sea of Japan side in the afternoon, causing heavy rain with thunder in some places due to the moist air.



On the Sea of Japan side of Tohoku, there is a risk of extremely heavy rain accompanied by thunder from tonight until tomorrow, leading to heavy rain.

Rain forecast
The predicted hourly precipitation on the 15th is high in places
Tohoku Sea of Japan side 50mm
Tohoku Pacific side 30mm

The predicted hourly precipitation on the 16th is high in places
Tohoku Japan Sea side 40mm
Tohoku Pacific side 30mm

15th 6:00 to 1 The predicted 24-hour rainfall by 6:00 on the 6th is expected to be high
Tohoku Sea of Japan side 120mm
Tohoku Pacific side 80mm

On the Tohoku Sea of Japan side, from early evening of the 15th to early morning of the 16th, please be on strict alert for landslides caused by heavy rain, and be cautious of flooding of low-lying land, rising water levels, and flooding of rivers. Also, be careful of lightning and gusts of wind.

Today's weather on the 15th (Wednesday): Thunderstorms will occur mainly in northern Japan due to the influence of a low pressure system starting from Typhoon No.9

2026/07/15 06:58

Today, the 15th (Wednesday), an extratropical cyclone that will transform from Typhoon No. 9 is expected to move northeast across the Sea of Japan, accompanied by a front.
Warm, humid air from a typhoon heading towards a low pressure system or front will flow into northern Japan, leading to heavy rain into tomorrow, the 16th (Thursday).



Typhoon No.9 is located in the Sea of Japan and is moving east-northeast. On the other hand, there is a high pressure system south of Okinawa that covers the Nansei Islands.
Currently, it is raining in some places in Hokkaido, Tohoku, and northern Kyushu.

Today, Typhoon No. 9 is expected to turn into an extratropical cyclone and move northeast across the Sea of Japan, accompanied by a front. Warm and humid air from the typhoon will flow towards this low pressure system and front, making the atmospheric conditions unstable.

In many places in Hokkaido, Tohoku, and Hokuriku, it will start raining in the evening, and in some places it will rain heavily, accompanied by thunder.
Especially in Hokkaido and Tohoku, there are areas where the ground has become loose due to heavy rain. Please be careful of landslides caused by heavy rain, flooding of low-lying areas, and rising water levels in rivers. Also, be careful of lightning and gusts of wind.

There will be some places on the Sea of Japan side of western Japan and northern Kyushu where it will rain due to the influence of moist air flowing in.

In other areas, it will be sunny, mainly on the Pacific side.



Maximum temperatures are expected to be higher than normal in many places nationwide.
It is extremely hot in some places, with temperatures exceeding 30 degrees Celsius, and even exceeding 35 degrees Celsius. In Nagoya, it is expected to be 37 degrees Celsius, hotter than body temperature.

Today, the 15th (Wednesday), a heatstroke warning alert has been announced in a wide area.
Please take precautions against heatstroke by hydrating frequently, supplementing with an appropriate amount of salt, taking breaks, and using an air conditioner indoors.
Please consider canceling outdoor activities in areas where a heatstroke warning has been issued.

There is a risk of heavy rain in northern Japan due to the influence of a low pressure system from tomorrow 15th to 16th. An extratropical low pressure system that will change from Typhoon No.9

2026/07/14 21:37

From the night of Wednesday the 15th to Thursday the 16th, an extratropical cyclone transforming from Typhoon No. 9 is expected to pass near Hokkaido, accompanied by a front.
There are some places in northern Japan where there will be heavy rain accompanied by thunder, and there is a risk of heavy rain reaching warning level.



Typhoon No. 9 is currently moving northeast near the Yellow Sea and is expected to turn into an extratropical cyclone tomorrow, the 15th (Wednesday). After that, it will move northeast across the Sea of Japan, accompanied by a front, and pass near Hokkaido until the 16th (Thursday).

In Hokkaido, Tohoku, and Hokuriku regions, warm, humid air from the typhoon is expected to flow toward the front, causing atmospheric conditions to become unstable. Heavy rain will be accompanied by thunder, and there will be heavy rain in some places.
In addition, winds will become stronger around low pressure systems and fronts, and it is likely that there will be sideways rain. Please be careful when going out.



Especially in northern Japan, there are areas where the ground has become loose due to heavy rains. Please be careful of landslides caused by heavy rain, flooding of low-lying areas, and rising water levels in rivers. Also, be careful of lightning and gusts of wind.
Depending on the degree of rain cloud development, there is a risk of heavy rain reaching warning level. Please check the latest information.

On the 14th (Tuesday), the hottest weather of the year occurred in various places: 38.3c in Hamamatsu City, Shizuoka Prefecture

2026/07/14 15:58

The Pacific high pressure system extended over western Japan, and as of 3:00 p.m. today (Tuesday) the 14th,
a wide range of eastern and western Japan was experiencing the hottest temperatures of the year.



Sakuma, Tenryu Ward, Hamamatsu City, Shizuoka Prefecture 38.3c (13:26) (7.3c higher than normal)
Nakamura, Shimanto City, Kochi Prefecture 38.2c (12:48) (higher than normal 6.8c higher)
Kuwana, Kuwana City, Mie Prefecture 37.9c (13:17) (7.1c higher than normal)

The heat is exceeding the hottest period of midsummer in various places.
Right after the rainy season ends, your body is not yet used to the heat, and
is said to be at high risk of heat stroke.
Please take precautions against heatstroke by staying hydrated frequently, getting enough sleep,
staying in a cool place, etc.



Symptoms of heatstroke may suddenly become severe.
If you feel unwell, please talk to those around you and
try not to be alone when taking a break.

14th (Tuesday) West Japan is so hot that it's beyond body temperature, and the temperature is expected to continue at night, making it difficult to sleep.

2026/07/14 12:44

Typhoon No. 9 is moving east-northeast near the Yellow Sea with strong winds.
An anticyclone is stationary far east of Japan, and a Pacific anticyclone is protruding south of Kyushu. On the other hand, northern Japan is sandwiched between two high pressure systems, creating a trough of pressure.



Today, the 14th, northern Japan and Hokuriku are likely to be cloudy, and the weather is likely to rain on and off.

On the other hand, areas from the Kanto region to the west will experience widespread sunshine and temperatures will rise in many places. Dangerous heat is expected in the Tokai and Shikoku regions, exceeding body temperature.



Rising temperatures near the ground will make the atmospheric conditions unstable, and there is a risk of localized thunderstorms along inland mountains. Please pay attention to the latest weather information.

Typhoon No. 9 will turn into a low-pressure system tomorrow and is expected to move east across the Sea of Japan, accompanied by a front, and reach west of Hokkaido. The area of rain will gradually spread, and it will be rainy and cloudy over a wide area on the Sea of Japan side of Honshu. The weather is expected to continue to deteriorate in eastern Japan until around Friday.



The heat is expected to continue for the next week.

In many places, the minimum temperature is over 25c, making it a tropical night, making it difficult to sleep. Don't forget to take precautions against the heat at night, such as using the air conditioner properly and drinking water before bed.

Weather today, the 14th (Tuesday): Extreme heat from Kanto to the west

2026/07/14 07:12

Western Japan is expected to be covered in high pressure. A low pressure system with cold air in the sky is expected to slowly move north over the southern coast of Hokkaido.

From the Kanto region to the west, strong sunlight will shine, and temperatures are expected to rise to around 35c during the day. Inland areas can become dangerously hot, exceeding body temperature. Temperatures will be higher than yesterday in many places. Please be careful about heat stroke. In addition, there is a risk of sudden changes in the weather mainly along the mountains in the afternoon.
Northern Japan and Hokuriku will be covered in clouds and the weather will not be refreshing. There is a possibility of rain showers in places, mainly on the Sea of Japan side, so please bring an umbrella with you.

Severe heat from western Japan to eastern Japan - 34 degrees Celsius expected in central Tokyo - be wary of heatstroke

2026/07/14 07:11

Today, the 14th (Tuesday), many places from western Japan to eastern Japan will be covered in high pressure and will be sunny, with sunshine reaching many places. Yesterday, the 13th, was hot mainly in western Japan, but today, the 14th, the heat will expand to eastern Japan, and it will be an extremely hot day in many places from western to eastern Japan.

The predicted maximum temperature in each region is 30c in Sapporo, 30c in Sendai, 34c in Tokyo, 32c in Kanazawa, 37c in Nagoya, 34c in Osaka, 35c in Kochi, and 34c in Fukuoka.
In addition, Maebashi City in Gunma Prefecture, Kumagaya City in Saitama Prefecture, Chichibu City, and Miyazaki City in Miyazaki Prefecture are forecast to reach 37 degrees Celsius, with some places from western Japan to eastern Japan expected to experience dangerous heat exceeding body temperature, especially in inland areas.
This will be the hottest day of the year in central Tokyo, so please take precautions against the heat.



The Ministry of the Environment and the Japan Meteorological Agency have issued heatstroke warning alerts from Kyushu to Chubu, targeting 17 regions. This will be the first announcement of this year in Yamanashi, Mie, Toyama, Tottori, Tokushima, and Kochi prefectures.

#Area covered by heat stroke warning alert
Kagoshima (excluding Amami region), Miyazaki prefecture, Kumamoto prefecture, Nagasaki prefecture, Oita prefecture, Fukuoka prefecture, Yamaguchi prefecture, Kochi prefecture, Ehime prefecture, Kagawa prefecture, Tokushima prefecture, Hiroshima prefecture, Wakayama prefecture, Military In areas where heatstroke warnings have been issued for Kyoto Prefecture, Toyama Prefecture, Mie Prefecture, and Yamanashi Prefecture, there is a risk of damage to human health due to heatstroke due to significantly higher 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 heat stroke indoors.

Tomorrow, the 14th (Tuesday), the extremely hot area will expand to the east, with temperatures reaching body temperature in the inland Kanto region and the Tokai region

2026/07/13 18:34

Tomorrow, the 14th (Tuesday), the Pacific anticyclone will expand its strength to eastern Japan. The Kanto and Tokai regions, which were cloudy and rainy today, are expected to see sunshine and temperatures to rise significantly.



With the expansion of the Pacific anticyclone, warm air at around 1500m above the ground will also expand eastward. If the weather is sunny, the warm air, which could reach temperatures of over 35 degrees Celsius, is expected to spread not only to western Japan, but also to the Sea of Japan and the Pacific side of eastern Japan.As a result, temperatures will rise in many places compared to today.

Tomorrow, the 14th (Tuesday), sunny areas will expand to the east, and even in eastern Japan, there is a risk of dangerous heat especially in inland areas.



Looking at the distribution of temperature forecasts at 3pm tomorrow, western Japan, the Tokai region, and the Kanto-Koshin region are likely to reach 30 C or higher, except for high-altitude areas. In addition, areas with temperatures above 35 degrees Celsius are expanding in the inland areas and the Nobi Plains.

Temperatures are expected to be significantly higher than today, especially in inland areas, with the highest temperature expected to be 37c in Nagoya City and 36c in Maebashi City, Kumagaya City, Gifu City, etc. Okayama City, Tokushima City, Kochi City, and other cities will experience an extremely hot day with temperatures reaching 35 degrees Celsius, and Osaka City and central Tokyo will also experience temperatures of up to 33 degrees Celsius. The heat can quickly become dangerous, so it is essential to take thorough measures to prevent heat stroke.

Western Japan also continues to experience high temperatures, and there is a possibility that the number of locations with extremely hot days will be the highest this year. The temperature does not drop easily at night, so please be careful of heat stroke both day and night.