Tomorrow, the 17th (Friday) Lightning warning area expanded; be careful of heavy rain, gusts of wind, and hail

2026/07/16 12:59

A low pressure system accompanied by a front is passing near Sakhalin. Low pressure On the other hand, there is a high pressure system south of Okinawa, which is stationary near the Nansei Islands.
The Tohoku region is currently covered in rain clouds, and the weather is expected to gradually improve after this.
The heat continues today, with temperatures nationwide being higher than normal,
predicted to be even hotter than midsummer.
Sapporo is expected to be at 31c, Tokyo is expected to be at 35c, and Nagoya is expected to be at 37c, so it looks like the temperature will be unbearable. Please take care of your health.



In addition to the rise in temperature near the ground, the influence of warm, humid tropical air brought in by the low pressure system that was Typhoon No. 9 will make the atmosphere unstable in the afternoon of today (Thursday) the 16th,
and there is a risk of heavy rain accompanied by thunder mainly along the mountains of the Kanto region.



Tomorrow, the 17th (Friday), there will be some sunshine in western Japan, but the atmospheric conditions are unstable mainly in the Kanto, Hokuriku, and Kyushu regions, and there is a risk that rain clouds may form locally in the morning.





It is expected that areas with a higher probability of lightning than today will expand, such as along the mountains of the Kanto and Hokuriku regions and the Kyushu, Chugoku, and Shikoku regions.Please pay close attention to the latest information and be wary of the sudden development of rain clouds.
In the target areas, please be careful of flooding of low-lying land, rising river water, flooding, and landslides.

The end of the rainy season is announced earlier than normal in northern Kyushu, Shikoku, and Kinki. Large typhoon No. 9 approaches the Sakishima Islands on the 11th (weather summary from July 5th to July 11th, 2026)

2026/07/16 07:42

This is a summary of the weather for this period (July 5th to July 11th, 2026).

#Summary of the weather for this period (July 5th to July 11th)
During this period, warm air tends to enter, and after the rainy season front became unclear, some places in western Japan recorded extremely hot days. Particularly in western and northern Japan on the Sea of Japan side, there were some places where the air currents over the mountains caused high temperatures, and the average temperature was above normal, mainly on the Sea of Japan side. Temperatures on the Pacific side of eastern Japan were below normal in some places due to the influence of cool air north of the seasonal rain front.

Although heavy rain was recorded in some places in Kyushu and Shikoku in the first half of the period, the seasonal rain front gradually became unclear and high pressure became dominant, so the total amount of precipitation was below normal in many places. In the second half of the period, Hokkaido recorded much higher-than-normal precipitation due to the effects of a trough in atmospheric pressure and lower-level warm and humid air, and the Sakishima Islands due to the effects of Typhoon No. 9.

Sunshine hours tended to exceed normal levels, mainly from Tohoku to Kyushu on the Sea of Japan side, as the seasonal rain front became unclear near Honshu and there were many sunny days covered by high pressure. In Hokkaido, the number of cloudy and rainy days increased in the latter half of the period due to the effects of a trough in atmospheric pressure and warm, humid air in the lower levels, and there were some places where temperatures were below normal.



[About this period's weather]
#Characteristics of pressure distribution
On the 5th, the seasonal rain front stalled from northern Kyushu to near Shikoku, and the front extended as far east as Japan. The seasonal rain front remained stationary in western Japan until the 6th, but on the 7th the front near western Japan gradually became unclear, and the area around Honshu was widely covered by high pressure near Okinawa and high pressure east of the Chishima Islands. From the 8th onwards, the seasonal rain front was almost invisible around Honshu, and was covered by a high-pressure system extending far to the east of Japan.However, from the 9th to the 11th, the area around Hokkaido was susceptible to the effects of a trough in pressure and lower-level warm, humid air. Meanwhile, Typhoon No. 9, a large and powerful typhoon, moved westward near the Mariana Islands on the 5th, and passed through the Mariana Islands at its peak on the 6th. After that, it became a large and very strong force as it moved westward over the sea east of the Philippines, and around the 10th, it gradually changed its course to the northwest and headed north over the sea south of Okinawa. On the 11th, Typhoon No. 9 became large and powerful and passed near the Sakishima Islands. On this day, a daily maximum instantaneous wind speed of 45.3 m/s was observed in Kitahara, Kumejima Town, Okinawa Prefecture.

#Precipitation
On the 5th, heavy rain occurred mainly in western Japan due to the influence of the seasonal rain front. Extremely heavy rain of 76.0 mm/h occurred in Soeda Town, Fukuoka Prefecture, linear rain bands formed in Kumamoto Prefecture, and extremely heavy rain was observed in Uwajima City, Ehime Prefecture on Shikoku. On the 6th, the rainy season front brought rain over a wide area of western and eastern Japan, with particularly heavy rain observed in western Japan, especially in Kyushu. On the 7th, the rainy season front moved south of Honshu, with somewhat heavy rain near the Izu Islands. In western Japan, the seasonal rain front became unclear, but there was localized rain and thunderstorms along the mountains and inland. On the 8th, the area around Honshu was in a high-pressure zone, with almost no precipitation. The end of the rainy season was announced in northern Kyushu, Chugoku, and Kinki (all 11 days earlier than normal). On the 9th, there was a trough in the atmospheric pressure near Hokkaido, and the inflow of lower-level warm and humid air made the atmosphere unstable, resulting in heavy rain. On the 10th, heavy rain of 43.5 mm/h was observed in Nakatonbetsu, Hokkaido, and on the 11th, extremely heavy rain of 54.0 mm/h was observed in Fukagawa City, Hokkaido. On the 10th and 11th in the Nansei Islands, heavy rain was observed in Kunigami Village and Miyakojima City, Okinawa Prefecture due to Typhoon No.9.

#Temperature
On the 5th, there were some places in northern Japan that were covered in high pressure and the sunlight reached midsummer, and the temperature was recorded at 32.4c in Takasu, Kitaakita City, Akita Prefecture. On the 6th, western Japan experienced cloudy and rainy weather due to the seasonal rain front, but temperatures were high; in Miyazaki Prefecture, a temperature of 34.2 degrees Celsius was recorded in Akae, Miyazaki City, where southerly winds caused a ferohn phenomenon. On the 7th, midsummer air flowed over Kyushu and the temperature rose, with Dazaifu City, Fukuoka Prefecture experiencing an extremely hot day of 35.7c. On the other hand, in Tokyo, there was little sunshine due to easterly winds, and the maximum temperature remained at 24.7 degrees Celsius. On the 8th, the temperature rose due to sunshine and warm air brought in by Typhoon No.9. Extremely hot days were recorded in 10 locations, including Maebaru, Itoshima City, Fukuoka Prefecture, and Hita City, Oita Prefecture. On the 9th, the area around Honshu became an area of high pressure, with clear skies and rising temperatures. An extremely hot day of 35.3c was recorded in Kyoto. On the 10th and 11th, the area around Honshu continued to be in a high-pressure zone, and areas with clear sunshine recorded extremely hot days. On the 10th, Yatsushiro City, Kumamoto Prefecture experienced a heatwave of 37.2c, and on the 11th, Dazaifu City, Fukuoka Prefecture recorded a temperature of 39.2c, the highest in recorded history. The number of observation points on the extremely hot day on the 11th reached 43.

Weather forecast for today, the 16th (Thursday): Severe heat in a wide area, take full precautions against heatstroke! Be careful of sudden weather changes in the afternoon, especially in the Kanto-Koshin region.

2026/07/16 07:20

Today, the 16th (Thursday), a low pressure system accompanied by a front will move near Sakhalin. From Hokkaido to the Sea of Japan side of northeastern Japan and Hokuriku, there will be rain from the morning, with some localized areas experiencing heavy rain. Daytime rain will gradually stop in many places around this time.
However, the sun will reach after the rain, so it is expected to be extremely hot. In Hokkaido, Kitami and Obihiro cities are expected to experience extreme heat of 35 degrees Celsius. In Sapporo, the temperature will rise to 32 degrees Celsius, which will be much hotter than normal.



From Tohoku to Kyushu, many places are expected to experience severe heat following the previous day. Heat stroke warning alerts have been issued by the Ministry of the Environment and the Japan Meteorological Agency for the region from Tohoku to Kyushu, and the number of such areas is 27, the highest number this season.
In eastern Japan, temperatures are expected to reach 37 degrees Celsius in Kofu and Nagoya, and temperatures are expected to reach 35 degrees Celsius during the day in central Tokyo, potentially marking the first extremely hot day of the year.
Even in western Japan, temperatures are expected to rise to around 35 degrees Celsius in many places, and inland areas may experience dangerous heat that can exceed body temperature.

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



In the afternoon, atmospheric conditions will be unstable, especially in inland and mountainous areas of the Kanto-Koshin region. The weather may change suddenly after noon, especially in areas where there is a high probability of lightning, so please be careful of sudden rain or thunderstorms. Developed rain clouds that form inland or along the mountains may flow into the plains, so be careful of flooding of roads and low-lying land due to sudden heavy rain.There is also the possibility of lightning strikes, tornadoes, and other strong gusts of wind, so if you see signs that developed rain clouds or thunderclouds are approaching, please take precautions such as taking shelter inside a sturdy building.

The atmosphere will be extremely unstable in the Kanto-Koshin region tomorrow, the 16th (Thursday). Be careful of sudden thunderstorms and gusts of wind in the afternoon.

2026/07/15 18:35

There is a risk of guerrilla thunderstorms in the Kanto-Koshin region tomorrow, the 16th (Thursday). It is possible that this will coincide with the time you are returning home, so be careful of sudden changes in the weather. There are many extremely hot days with maximum temperatures over 35 degrees Celsius, and the intense heat continues. Please be careful of heat stroke.



The strong sun will shine tomorrow, the 16th (Thursday), but the atmospheric conditions are likely to become unstable in the afternoon as temperatures rise. There will be scattered showers and thunderstorms, with localized rain clouds.

The expected 1-hour precipitation on the 16th is high in the areas,
Northern Kanto region 40 mm
Southern Kanto region 30 mm
Koshin region 30 mm

The expected 24-hour precipitation from 18:00 on the 15th to 18:00 on the 16th is
Northern Kanto region 60 mm
Southern Kanto region 60 mm
Koshin region 60mm

Then, the predicted 24-hour precipitation from 18:00 on the 16th to 18:00 on the 17th is expected to be heavy in some places: 60mm
in the northern Kanto region and 60mm

in the southern Kanto region.

There is a risk of thunderstorms occurring during the time you return home, so please be careful of flooding on the roads.

There are three main phenomena that can be a precursor to guerrilla heavy rain (localized heavy rain).



#Pitch black clouds approach
Developed cumulonimbus clouds that bring about torrential rain appear pitch black. A sudden darkening of the sky is also a sign of torrential rain.
#I hear the sound of thunder
If you hear a rumbling sound, a thundercloud is approaching.
#Cold wind suddenly blows
From a cumulonimbus cloud that has developed, cold wind blows down along with raindrops.

If you feel any of these signs, immediately evacuate to a safe place.

15th (Wednesday) Many extremely hot days across the country; temperatures are expected to calm down in eastern Japan over the weekend

2026/07/15 18:33

Today, the 15th (Wednesday), was an extremely hot day across a wide area as warm, humid air bringing severe heat spread across eastern and northern Japan.

There were 736 locations with midsummer days of 30 C or higher, and 166 locations with extremely hot days of 35 C or higher.
(As of 17:00 on July 15th)

The highest temperatures today were Saijo City, Ehime Prefecture, and Iida City, Nagano Prefecture, both at 38.1c.

Western Japan is expected to be sunny and the severe heat will continue.
On the other hand, the weather in eastern Japan is expected to deteriorate, and the temperature is expected to calm down for a while.



In the Kanto region, the maximum temperature is expected to be around 30 degrees Celsius over the three-day weekend, which seems like a breather from the high temperatures that have continued for the past few days.



The reason for the temperature drop is the high pressure system that is expected to stay east of the Kuril Islands.
The northeast wind blowing in from this high pressure system will enter the Pacific side of eastern Japan, making it difficult for temperatures to rise.



However, although the temperature is low, the humidity is expected to be high.
Please continue to take good care of your health.

[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.