This year's first 35c or higher (extremely hot day) was observed nationwide in Hita City, Oita Prefecture, and Toyooka City, Hyogo Prefecture.

2026/05/18 15:31

Today, the 18th, the area around Honshu is covered by a high-pressure system with summer characteristics, and it is sunny over a wide area, with strong sunlight shining down and temperatures rapidly rising.
As of 3:00 p.m., a maximum temperature of 35.3 C was observed in Hita City, Oita Prefecture, and Toyooka City, Hyogo Prefecture, marking the first extremely hot day (highest temperature of 35 C or higher) nationwide this year.


The unseasonably hot weather will continue tomorrow, so please be careful not to get heat stroke.

To prevent heatstroke, please keep the following points in mind.

(1) Avoid the heat as much as possible and drink water before you get thirsty. It is effective to wear clothes that are as cool as possible, and to use parasols and hats.
If you sweat a lot, don't forget to drink not only water but also salt.
(2) Don't put up with the heat even indoors, use the air conditioner to lower the indoor temperature to an appropriate level. It is a good idea to keep a thermometer in the room and check the room temperature frequently.
When ventilating the room, we recommend opening two places, such as windows and doors, or using an electric fan or ventilation fan.

If you feel even slightly unwell, it is important to take a rest and do not push yourself too hard.
Elderly people, children, and people with disabilities are especially susceptible to heatstroke, so please be careful and have those around you be attentive.

This year's first 35c or higher (extremely hot day) was observed nationwide in Hita City, Oita Prefecture, and Toyooka City, Hyogo Prefecture.

2026/05/18 15:30

Today, the 18th, the area around Honshu is covered by a high-pressure system with summer characteristics, and it is sunny over a wide area, with strong sunlight shining down and temperatures rapidly rising.
As of 3:00 p.m., a maximum temperature of 35.3 C was observed in Hita City, Oita Prefecture, and Toyooka City, Hyogo Prefecture, marking the first extremely hot day (highest temperature of 35 C or higher) nationwide this year.


The unseasonably hot weather will continue tomorrow, so please be careful not to get heat stroke.
To prevent heatstroke, please keep the following points in mind.

(1) Avoid the heat as much as possible and drink water before you get thirsty. It is effective to wear clothes that are as cool as possible, and to use parasols and hats.
If you sweat a lot, don't forget to drink not only water but also salt.
(2)Don't put up with the heat even indoors, use the air conditioner to lower the indoor temperature to an appropriate level. It is a good idea to keep a thermometer in the room and check the room temperature frequently.
When ventilating the room, we recommend opening two places, such as windows and doors, or using an electric fan or ventilation fan.
If you feel even slightly unwell, it is important to take a rest and do not push yourself too hard.
Elderly people, children, and people with disabilities are especially susceptible to heatstroke, so please be careful and have those around you be attentive.

Today's 18th and tomorrow 19th will continue to be hot ahead of the season - be careful of heatstroke

2026/05/18 11:57

Today, the 18th (Monday), the area around Japan will continue to be covered in high pressure, and it is expected to be sunny in many places. The sun is expected to reach a wide area, and maximum temperatures are expected to be higher than normal in many places. The early-season heat will continue until tomorrow, the 19th (Tuesday).





Today, the 18th (Monday), as of 11am, the highest temperature was 32.6c in Yonago, Yonago City, Tottori Prefecture, 31.9c in Dazaifu, Dazaifu City, Fukuoka Prefecture, and 31.7c in Kaga Nakatsuhara, Kaga City, Ishikawa Prefecture.

Today's predicted maximum temperature is expected to be similar to July-August temperatures in many places near Honshu. The temperature is expected to be 33c in Yamagata, 33c in Nagano, and 33c in Kofu, similar to August. Also, the temperature will be 34c in Kyoto and 34c in Kumamoto, just one step away from the hottest day.

This season's hot weather will continue until the 19th (Tuesday), and the day after the 20th (Wednesday), a front will extend to western Japan, clouds will spread, and there will be less sunlight, which will keep the temperature from rising.

Please be careful of heat stroke until tomorrow the 19th (Tuesday).
If you are working or exercising outdoors, please take precautions such as using a parasol or hat, drinking water and salt frequently, and taking breaks. Also, if you are spending your time indoors, don't overdo it and use your air conditioner properly.

Weather for the week: After unseasonable heat, there will be more cloudy and rainy days, and it looks like we will be at the beginning of the rainy season.

2026/05/18 07:25

From now on, after the early-season heat, there will be many cloudy and rainy days.



It will become sunny in many places around Honshu until the 19th (Tuesday). Temperatures are expected to be around 30 degrees Celsius in many areas, so it's important to take precautions against the heat to avoid heat stroke. The weather is likely to turn downhill in Shikoku, southern Kyushu, and Okinawa due to the effects of low pressure and fronts.

From around the 20th (Wednesday), it will be easier for fronts and low pressure systems to pass near Honshu. On the 20th (Wednesday), it will rain mainly in western Japan, and on the 21st (Thursday) it will likely spread to the Tohoku and Kanto regions. As the rain starts to fall, the temperature will drop significantly in some places from around the 21st (Thursday). The extreme heat that precedes the season seems to be calming down for now.

After that, cloudy and rainy days are expected to continue around Honshu. There will be more days when fronts and low pressure systems will pass near Honshu, and it will be the beginning of the rainy season from western to eastern Japan. Depending on the weather after that, the rainy season may be announced in some places.
It is better to prepare for heavy rain before the full-fledged rainy season begins.

The weather today, the 18th (Monday), is unseasonably hot with temperatures approaching 35 degrees Celsius or higher, so be careful of heatstroke.

2026/05/18 06:53

Today, the 18th (Monday), the area around Honshu will be widely covered by a belt-shaped high pressure system. Warm air with a temperature of over 15 degrees Celsius will flow approximately 1,500 meters above the mainland, and strong sunlight will reach the area during the day.

For this reason, temperatures will be around 30c in a wide area from Tohoku to Kyushu. Although it is not yet the start of full-fledged summer, there may be some places that record extremely hot days with temperatures of 35 degrees Celsius or higher. Toyooka City in Hyogo Prefecture is expected to experience an extremely hot day of 35 degrees Celsius, Hita City in Oita Prefecture is expected to experience an extremely hot day of 35 degrees Celsius, Kyoto and Saga are expected to experience 34 degrees Celsius, Fukushima and Nagano are expected to experience 33 degrees Celsius, and Nagoya and Osaka are expected to experience 31 degrees Celsius, making it unseasonably hot in some places.



At this time of year, your body is not yet accustomed to the heat, so the risk of heatstroke increases. Please take all possible precautions against heat stroke, such as hydrating frequently, taking breaks, and using the air conditioner without restraining yourself.

Clouds tend to spread in Hokkaido due to the influence of local fronts. In northern Hokkaido, there are likely to be some places where it will rain until late at night. If you will be returning home late, it may be a good idea to bring a folding umbrella.
In Okinawa, the atmospheric conditions are unstable due to the influence of cold air in the upper atmosphere, and there are likely to be some showers in the afternoon.

[Weekly Weather] Summer heat continues in the first half, rain gear comes in handy in the second half

2026/05/17 13:28

Over the weekend, a strong high-pressure system blanketed the area around Japan, making it unseasonably hot in many parts of the country. This high pressure system will gradually move away to the east of Japan through Tuesday. From now on, the weather is expected to be changeable as low pressure systems pass periodically.
A front will move east from the continent on Tuesday.
As a result, sluggish weather is expected mainly in western Japan from Tuesday to Wednesday. There is a possibility that another low pressure system will pass near Japan from Thursday to Saturday, and the weather is expected to deteriorate around Honshu.



Let's take a look at the latest weekly weather forecast.



Although clouds tend to spread over Hokkaido, there will be no major changes in the weather until the weekend, and the weather is expected to be relatively pleasant and sunny.

From Monday to Tuesday, the weather is clear and the sun shines brightly from eastern to western Japan, and the temperature rises rapidly. It's midsummer day in many places, with maximum temperatures around 30 degrees Celsius, so it's likely to be the start of a week in which the unseasonably hot weather will hit your body. When going out, please take strict precautions against heatstroke, such as hydrating frequently and choosing appropriate clothing.

On the other hand, in the second half of the week, the high pressure system will gradually move away to the east, and the weather will deteriorate near Honshu due to the influence of the front. As moist air tends to flow towards the front, there is a possibility that the rain may become heavier locally.
It's safe to carry a folding umbrella when you go out.
Before heading out, be sure to check the latest weather information.

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.