Today, the 17th, is unseasonably hot in various places, 32 degrees Celsius is expected in Nagoya, and it's midsummer in Tokyo too, so be careful of heatstroke

2026/05/17 06:59

Yesterday, the 16th, the sun reached the country and the temperature rose. The highest temperature rise was in Kake, Hiroshima Prefecture, at 32.6 degrees Celsius, breaking the record for this year's highest temperature in Japan. In addition, temperatures rose mainly in inland areas, with temperatures reaching 32.3 degrees Celsius in Hita, Oita Prefecture, and 31.7 degrees Celsius in Takahashi, Okayama Prefecture, making it midsummer in 40 locations, the highest this season.



Today, the 17th, the area around Japan is expected to be covered by high pressure and sunlight will reach a wide area. Additionally, the unseasonably hot weather is likely to continue as warm air flows in at temperatures of +15 C or higher at around 1500m above the ground.

The predicted maximum temperature in each region is Sapporo 18c, Sendai 27c, Tokyo 30c, Nagoya 32c, Kanazawa 22c, Osaka 29c, Kochi 29c, and Fukuoka 28c.

From Tohoku to Western Japan, there are many places where temperatures can reach around 30c during the day, making it unseasonably hot. Temperatures are expected to rise, especially in inland areas, with temperatures expected to reach a maximum of 33 C in places such as Shobara in Hiroshima Prefecture, Kurume in Fukuoka Prefecture, and Hita in Oita Prefecture. Even in Nagoya, it is predicted to be 32 degrees Celsius, making it the hottest day of the season.
It is expected to be 30 degrees Celsius in central Tokyo, making it likely to be the first midsummer day of the season. If you are active outdoors, please take precautions against heatstroke, such as frequently drinking water and salt.

On the other hand, the temperature in Hokkaido and the Sea of Japan side of Tohoku to Hokuriku will not rise, and the temperature difference from the previous day will be large. Please be careful not to get sick due to the daily temperature difference.

Today's weather on the 17th (Sunday): Sunny skies across a wide area Okinawa is also closed during the rainy season

2026/05/17 06:25

Today, the 17th (Sunday), the area around Japan is expected to continue to be covered in high pressure. The sun is expected to reach a wide area, and temperatures are likely to rise during the day. It will be sunny even in Okinawa, which is in the rainy season.



There are times when the sun reaches Hokkaido, but the sky is cloudy. However, there are no major changes in the weather, so it should be a good day to go out.

There will be wide blue skies from Tohoku to western Japan. The weather is not bad here either, and it looks like it will be a sunny day where you can enjoy going out. Temperatures will rise during the day, with maximum temperatures reaching around 30 C in many places. Those who are active outdoors need to take precautions against heatstroke.

Okinawa will be sunny during the rainy season.

The Ogasawara Islands will be affected by the front, so it's likely to be a rainy day.

16th (Sat): Sunny and midsummer days; high temperatures continue from now on

2026/05/16 16:40

The area around Honshu was covered with high pressure, and it was sunny and there were some spots in western Japan where it was observed as a midsummer day.

[Highest temperature until 15:00 today]
Akiota Town, Yamagata District, Hiroshima Prefecture 32.6c (highest this year)
Takahashi City, Okayama Prefecture 31.7c (highest this year)
Kurume City, Fukuoka Prefecture 31.5c (this year's highest)



High temperatures are expected to continue from tomorrow onwards from eastern to western Japan.
Summer weather is expected in Joetsu for the first half of the week.



This is the time when your body is not yet used to the heat.
Let's take precautions against heat stroke so that we don't get sick due to the sudden heat.

Weekly weather: Many sunny days with high temperatures nationwide. Rain expected from the west around the 21st of next week

2026/05/15 07:20

From this weekend through next week, the area around Honshu will be covered in high pressure, so there will be many sunny days. Areas near Okinawa are not easily affected by the rainy season front, so it is likely that the holidays will continue during the rainy season.



However, temperatures nationwide will tend to be higher than normal, and it will be hot. The predicted maximum temperature is likely to be 25 degrees Celsius or higher on many days, and in some areas the daily maximum temperature is expected to continue to be close to 30 degrees Celsius. After that, it is expected that temperatures will continue to be higher than normal across the country, especially from Tohoku to Okinawa, so it will be essential to take measures such as staying hydrated frequently and taking adequate breaks to avoid heatstroke.

From around the middle of next week, around the 20th (Wednesday), clouds will gradually become more likely to spread across the country. Around the 21st (Thursday), a front and low pressure system will approach from the west, and it is likely to bring rain mainly to western Japan. Rain is expected to spread to eastern Japan around the 22nd (Friday). In some places, there will be heavy rain accompanied by thunderstorms.
There is a wide range of predictions at this point regarding the path of the low pressure system, the path of the front, and the strength and timing of rain, but please be sure to check the latest weather information that will be updated in the future.

One-month forecast: It's getting hotter nationwide, with "very high temperatures" from Tohoku to Okinawa, and signs of the rainy season in western and eastern Japan

2026/05/14 19:40

On the 14th (Thursday), the Japan Meteorological Agency announced the latest one-month forecast, which shows the weather outlook for the next month.



Temperatures around 1500m above the ground are expected to be higher than normal near Japan. It is expected that the whole country will be covered in warm air.
The monthly average sea level pressure forecast is that a high pressure system will extend east of Japan to the south of Japan, and in the first half of the period, the area around Okinawa and Amami will be less affected by fronts and low pressure.
On the other hand, a weak pressure trough (red dashed line in the diagram) is expected from central China to western Japan and eastern Japan, and western and eastern Japan will be susceptible to the effects of moist air circulating around fronts and the edges of high-pressure areas.



From now on, temperatures will be higher than normal across the country. On the 14th (Thursday), the Japan Meteorological Agency announced "early weather information regarding high temperatures." From around May 20th to around May 28th, regions except Hokkaido are expected to experience ``considerably high temperatures.'' Although it is not yet the start of full-fledged summer, there will be many midsummer days with maximum daytime temperatures of 30c or higher. From this weekend to next week, it is likely that there will be places in western and eastern Japan where the temperature will reach over 30 degrees Celsius. Please take all possible measures to prevent heat stroke.



Okinawa/Amami is expected to be less affected by fronts and moist air until late May due to the influence of high pressure in the south of Japan. From June onwards, there will be many cloudy and rainy days, similar to normal years.

Western and eastern Japan will be susceptible to fronts and humid air from late May onwards. There will be more cloudy and rainy days, and we will gradually move into the rainy season. Depending on the weather conditions, heavy rain may occur early in the rainy season, so please prepare early for heavy rain disasters.

[Breaking News] Localized thunderclouds are forming from Tohoku to Western Japan

2026/05/14 16:08

Today, the 14th, when temperatures rose in various places,
atmospheric conditions became extremely unstable, with localized rain clouds forming
in various places.

In Yamaguchi and Kochi prefectures, heavy rain of over 50 mm per hour has been reported,
Currently, active rain clouds have formed in Kanagawa prefecture, and lightning strikes have also been observed.





In heavy rain over a short period of time, the rain falls at once in excess of the drainage capacity, which may cause roads to flood and low-lying land to be flooded.



Please promptly move away from dangerous areas such as low-lying land, underpasses, underground spaces, etc.
Please ensure the safety of yourself and those around you by paying attention to the latest weather information.

[Rain clouds and thunderclouds are developing] Be careful of sudden thunderstorms even in urban areas! Saturdays and Sundays are sunny and it's summer heat (commentary: weather forecaster Atsuko Miyake)

2026/05/14 14:15

We need to be careful about changes in the sky today.
Even if it's sunny now, please be careful of sudden rain or thunderstorms.



Looking at the state of the rain clouds at 2:00 p.m.,
there are places with rain and thunderstorms mainly along the mountains from Tohoku to Shikoku.

Rain clouds and thunderclouds are rapidly developing from the afternoon.

There are moist air and active clouds surrounding Okinawa due to the rainy season front.

After this, there is a risk of heavy rain and thunderstorms in the Yaeyama region of Okinawa, Ishigaki Island, etc.
into tomorrow (Friday).
Please be careful of sudden heavy rain, lightning, gusts of wind, hail, etc.
There is a risk of heavy rain with a warning level.

After this, the weather will suddenly change not only along the mountains but also in the
plains near Honshu, with the possibility of thunderstorms.



Let's take a look at the rain forecast.
After this, rain clouds are likely to develop along the mountains from the Kanto region to the Tokai region,
as well as Shikoku, the Chugoku region, and the Kyushu region, by 3:00 p.m.

As strong cold air flows into the sky,
the atmospheric conditions will become extremely unstable.
Rain clouds are suddenly forming and there is a risk of heavy rain.

There is a risk of rain and thunderstorms again in urban areas (like yesterday).
And there is a risk of heavy rain and thunderstorms in Tokyo and other areas from the evening until late at night.



What should we do if a thunderstorm suddenly strikes after this
If you hear thunder, try to move to a sturdy building.
Also, when it rains in urban areas,
drainage can't keep up and the underpass may overflow.
Also, please stay away from underground facilities.
Be sure to check radar for the latest information on how long the active rain clouds will last and when the rain will stop.



Tomorrow (Friday), high pressure will cover the area around Honshu.
The unstable state of the atmosphere will be resolved tomorrow,
It looks like many places will have stable skies.

The temperature is expected to rise to 25c in Tokyo and 28c in Osaka.
We need measures against the heat.



Weekly forecast.
From now on, it will be sunny in many places through the first half of next week.
It looks like it will be quite hot on Saturday and Sunday.

The temperature in Tokyo was 28c on Saturday, which is similar to early July.
The temperature in Osaka is also expected to reach 28c on both Saturday and Sunday.
If you will be working outside for a long time, please take proper precautions against the heat.

And in Naha, it is expected to be sunny for a while.
It looks like we will be taking a break during the long rainy season.

[This year, measures against heat and bears are essential] Sendai Aoba Festival What is the weather like on Saturday and Sunday (Commentary: Weather forecaster Atsuko Miyake)

2026/05/14 13:09

The Sendai Aoba Festival will be held this Saturday and Sunday (May 16th (Sat) to May 17th (Sun), 2026).



The "Aoba Festival" colors Sendai, the capital of fresh greenery.

This year marks the 390th anniversary of the death of Date Masamune.

The main venue is Nishi Park and Jozenji Street.

The highlight is "Sendai Sparrow Dance 2026".

More than 140 festival troupes (mazura) will take part, performing splendid dance performances throughout the city over two days.



Now, let's take a look at the weather on Saturday and Sunday.

Sendai Aoba Festival, both Saturday and Sunday are expected to be sunny.
It looks like the weather will be mild and sunny due to high pressure.

It will feel a little chilly in the mornings and evenings, so you will need a jacket, but
daytime temperatures are expected to reach 24c on both Saturday and Sunday.

It seems safe to say that it is as hot as late June.

If you are going to participate in the Sparrow Dance, please take precautions against the heat.



Also, those who go to see the show need to take precautions against the heat.
Please avoid direct sunlight by wearing a hat or using a
parasol in places where there are not many people.

And be sure to drink water frequently.

This year, there have been a number of bear sightings in Sendai City.
The festival also calls for measures against bears.

Leaving trash may attract bears, so please take your trash home with you or throw it away at the trash station.

[Ocean Summary] Sea surface temperature in the western Japan Sea is 4c higher than normal

2026/05/14 12:33

A low pressure system accompanied by a front moved northeast across the Sea of Japan, and the front moved south through Kanto and Tohoku, becoming a barge in the south of Kanto and east of Kanto.
On the western continental side of the Sea of Japan, sea surface temperatures continued to be significantly higher than normal, reaching a maximum of 4 C above normal.
Below is a summary of the ocean (May 3-9, 2026)



#Pressure distribution and waves
On the 3rd, there was a low pressure system east of the Kuril Islands and the sea near the Kuril Islands, and the gradient of the atmospheric pressure increased around the front.
There were places in the east of Japan, near the Kuril Islands, and in the Sea of Okhotsk.
On the 4th, a low pressure system accompanied by a front moved northeast across the Sea of Japan.
The waves were high in the waters around Japan, and there were waves from the south of Kanto to the east of Kanto.
On the 5th, a high pressure system moved south of Japan, and a front extended from south to east of Japan.
The pressure gradient between the high pressure system and the front increased, causing waves to rise in the central Japan Sea and east of Japan.
On the 6th, a continental low pressure system moved eastward, and a high pressure system moved east of Japan.
The waves were high in the central and northern parts of the Sea of Japan, and the northern part was flooded.
From the 7th to the 8th, the waves in the seas near Japan remained calm.
On the 9th, a low pressure system accompanied by a front moved northeastward east of Japan, and waves rose again in the waters near Japan.



#Sea surface temperature
Sea surface temperatures in the Japanese waters continued to be significantly higher than normal on the western continental side, and were up to 4c higher.
In other areas, the area of sea area that was at normal level gradually expanded.
The East China Sea and the waters around the Nansei Islands continued to be at normal levels.
South of Japan, sea areas continued to be slightly higher than normal.
The sea off the coast of the Tokai region was slightly lower than normal, and from the south of Kanto to the east of Kanto was near normal.
Off the coast of Sanriku, the sea area continued to be significantly lower than normal, with temperatures up to 4 C lower.
The waters near the Kuril Islands and the Sea of Okhotsk continued to be at normal levels.

Western and eastern Japan are sunny and temperatures are rising; northern Japan is cool

2026/05/14 07:30

Yesterday, the 13th (Wednesday), it was sunny in many places from the morning, and the temperature rose mainly from western to eastern Japan, reaching 29.5 degrees Celsius in Tajimi City, Gifu Prefecture, making it just before midsummer.



Today, the 14th (Thursday), will also be covered by high pressure and will be sunny in many places. Warm air will cover eastern and western Japan, and temperatures are expected to rise during the day. In places like Nagoya, Gifu, and Okayama, the maximum temperature is expected to reach 29c, just before midsummer. Please be careful not to get heat stroke by drinking plenty of water.

On the other hand, in northern Japan, cold winds will blow from the sea, so temperatures will drop from the previous day, especially on the Pacific Ocean side and the Sea of Okhotsk side of Hokkaido. In Abashiri, the temperature is expected to be 7c, which is 12c lower than the previous day. Please take care of your physical condition as there will be a large temperature difference from the previous day.

The predicted maximum temperature in each region is Sapporo 19c, Sendai 17c, Tokyo 26c, Nagoya 29c, Kanazawa 22c, Osaka 28c, Kochi 27c, and Fukuoka 25c.