Latest 1-month forecast: The season is gradually turning into the rainy season. Prepare early for heavy rain disasters. Be careful of "considerable high temperatures" from the Tokai region to Kyushu.

2026/05/28 21:36

On the 28th (Thursday), the Japan Meteorological Agency announced the latest one-month forecast, which shows the weather outlook for the next month.



The monthly average sea level pressure is predicted to increase in strength in the southeast of Japan. As a result of this, it will be easier for moist air to flow around the edge of the high pressure system around western and eastern Japan. Additionally, the atmospheric pressure near the Sea of Okhotsk is expected to be lower than normal, making it easier for warm air to flow in.
Temperatures around 1500m above the sky will be higher than normal near Japan.



From now on, we will gradually move into the full-fledged rainy season. It is expected that humid air will easily enter western Japan and the Pacific side of eastern Japan, making it easier for the rainy season front to stagnate near Japan. Precipitation tends to be higher on the Pacific side of western and eastern Japan. It is predicted that during the rainy season there will be more rainfall than normal, so it is best to prepare for heavy rain disasters as early as possible.
In addition, at the beginning of June, Typhoon No. 6 will move northward near Japan, which may have a major impact on the weather near Japan. Please pay attention to future information.



From now on, it is likely that temperatures will continue to be higher than average nationwide. Especially in western Japan, be careful of ``considerable high temperatures'' around the beginning of June.
On the 28th (Thursday), the Japan Meteorological Agency announced "early weather information regarding high temperatures" for the Tokai region and southern Kyushu region. The announcement comes at a time when the probability of extremely high temperatures reaching once-in-a-decade levels is higher than usual, and regions west of the Tokai Sea are expected to experience ``considerable high temperatures'' starting around the 3rd. Also, the added influence of humid air is likely to make it humid and uncomfortable.

To avoid heatstroke, please take precautions against the heat, such as drinking plenty of water and salt, taking adequate breaks, using air conditioning, and adjusting your clothing.

[New Disaster Prevention Weather Information] Weather information will also be organized into "Weather Disaster Prevention News" and "Weather Explanation Information"

2026/05/28 18:38

New disaster prevention weather information will begin in the afternoon today, May 28th (Thursday). As a result, the warnings and advisories issued by the Japan Meteorological Agency will be significantly revised.

This topic introduces ``Weather Disaster Prevention News'' and ``Weather Explanation Information.''

In this new disaster prevention information,
In addition to warnings that are directly linked to alert levels, "weather information" that supplements the situation will also be organized.



Information that was previously conveyed as several types of "weather information" is now broadly classified into two types: "weather disaster prevention bulletin" and "weather commentary information." Having a uniform name makes it easier to understand the role of each piece of information.

Now, let's take a look at the information for each.

# [Weather Disaster Prevention News] = "Information that reports extreme phenomena in a breaking news manner"



"Weather Disaster Prevention Bulletin" is used to notify when a specific extreme phenomenon, such as a linear precipitation band, has occurred or is about to occur.

In other words, it is information that ``breaks the news when extreme phenomena such as intense rain or tornadoes have already occurred or are about to occur.''
If you see the word ``breaking news,'' you should think that ``the phenomenon is occurring somewhere, or there is a high possibility that it is imminent.''

Examples include ``Weather Disaster Prevention Bulletin (Heavy Rains in a Record Short Time)'' and ``Weather Disaster Prevention Bulletin (Linear Rain Band Occurrence)''.
Additionally, new information on "Last-minute forecast for linear precipitation belts" will be added.


# [Weather commentary information] = "Comprehensive explanation information"



"Weather commentary information" is information that comprehensively explains the current or future weather conditions and the outlook for disaster risk.
It has the role of supplementing information such as warnings and alerting people in advance.

If this information comes out, you should think that ``some kind of extreme phenomenon may occur in the near future.''

Examples include weather commentary information (linear precipitation zone forecast half a day in advance)/weather commentary information (typhoon No. #).


Ahead of the heavy rain season, it is a good idea to use this weather information in advance to prepare for disasters.

[New disaster prevention weather information] What is a "danger warning" that will start sequentially from this afternoon (Commentary: Weather forecaster Atsuko Miyake)

2026/05/28 14:35

New disaster prevention weather information will be rolled out from the afternoon of today, May 28th (Thursday).
Today we will talk about danger warnings.



Heavy rain disasters occur almost every year, but the challenge every time a disaster occurs is
``not knowing when to evacuate.''



In fact, the Japan Meteorological Agency also announced various information such as heavy rain warnings, landslide warning information,
information regarding significant heavy rain.
I think it was difficult for the general public to understand which information was dangerous
.
This time, the disaster prevention weather information will change drastically from this afternoon.



This change is not about providing information, but
is a review with an emphasis on leading to action.

The biggest change this time is
this level division.
For example, regarding heavy rain. Level 1 is early warning information,


information level is heavy rain advisory, level 3 heavy rain warning, level 4 radish danger warning, level 5 heavy rain special warning. That's what it means.


The level will be included in the name, creating a sense of unity and making it easier to understand the degree of danger.



This is a list showing the alert level and actions to be taken.
At the level 2 warning level, evacuation actions are confirmed,
at the level 3 warning level, elderly people and others are evacuated from dangerous areas.


A level 4 danger alert requires everyone to evacuate from dangerous areas.


And at alert level 5, lives are in danger.
Please ensure your safety immediately.



What I would like you to especially remember this time is this level 4 danger warning. This has been newly installed


This information has been unified with the existing landslide warning information, flood risk information, etc.


information regarding the stage at which evacuation is necessary.


Level 4 means that all people in dangerous areas must evacuate.
In recent years, the risk of heavy rain disasters can increase rapidly at night.
By evacuating at night, you may end up encountering a disaster.
, so I would like Level 4 to be the level for completing evacuation, not for the start of evacuation.



However, it is important to note that this Level 4 Danger Alert may suddenly upgrade from a Level 2 Alert to a Level 4 Danger Alert.

When the rain suddenly intensifies, such as in a linear precipitation zone, the
level 3 warning may be exceeded and level 4 is reached.



If you feel that the rain is falling differently than usual,
be sure to pay close attention to your surroundings and begin preparations for evacuation, even when a Level 2 advisory is issued.

Ahead of the heavy rain season, it is a good idea to discuss in advance with your family where you will evacuate and
when you will move.

Typhoon No. 6 (Changmi) will approach Okinawa with strong force early next month

2026/05/28 07:16

Typhoon No. 6, which occurred yesterday (27th), is in the east of the Philippines as of 6:00 am today, 28th, and is moving slowly north-northwest.

#Typhoon No.6 28th (Thursday) 6:00
===================/br Center position East of the Philippines
Move North-northwest Slowly
Central pressure 1000 hPa
Maximum wind speed 18 m/s (near the center)
Maximum instantaneous wind speed 25 m/s
==================



From now on, Typhoon No. 6 is expected to continue moving northward as it continues to intensify, and is expected to be accompanied by strong winds on the 30th (Saturday). It is expected to develop into a "strong" force on the 31st (Sunday), and as the month changes, it will move south of Okinawa on the 1st (Monday), and will be closest to Okinawa around the 2nd (Saturday).

There is a risk that Okinawa will be affected by typhoons, including rough weather from the beginning of next month. Please take early typhoon measures.
Also, due to the influence of moist air around the typhoon, the front may become more active, which may affect areas far away from the typhoon. Please pay attention to the latest typhoon information.

Today's weather on the 28th (Thursday): The sky is not clear across the country. The rain and wind are gradually increasing in northern Japan.

2026/05/28 06:25

Today, the 28th (Thursday), a low pressure system and front are expected to move eastward near Japan. There will be a lot of clouds from northern Japan to western Japan, and there will be some places where it will rain. In addition, people in northern Japan should be careful of rain and strong winds starting in the afternoon.



As a low pressure system approaches, it will start raining in the afternoon in northern Japan, and in some places the rain will become heavier. In addition, the wind is strong at night, especially in coastal areas, and there is a risk of torrential rain, so if you are returning home late, please bring sturdy rain gear.
The weather in Hokuriku will gradually deteriorate in the afternoon, so please prepare rain gear when going out.

The Kanto region will receive sunshine in the morning, but will be covered in thick clouds in the afternoon. There is a possibility of rain during the day, so it's a good idea to carry a foldable umbrella.
There seems to be a possibility of rain in the Tokai region, especially in the morning.

On the Pacific side of western Japan, there will be some lingering rain mainly in the morning, but there will be places in Shikoku and southern Kyushu where the sun will return in the afternoon. On the other hand, the weather is not clear on the Sea of Japan side, and there are likely to be some places where it will rain, especially in the afternoon.

Temperatures are expected to be higher than normal nationwide, although clouds will likely spread. It can feel hot and humid during the day, so take precautions against the heat by staying hydrated frequently and choosing breathable clothing.

Typhoon No. 6 (Changmi) is expected to develop and move northward

2026/05/27 18:40

At 9:00 am on Wednesday, May 27th, a tropical cyclone developing in the Caroline Islands became
Typhoon No. 6 (Changmi).



#Typhoon No. 6 May 27th (Wednesday) 9:00
Center location: Caroline Islands
Direction and speed: west-northwest 25 km/h
Central pressure: 1000 hPa
Maximum wind speed: 18 m/s (near the center)
Maximum instantaneous wind speed 25 m/s

Typhoon No. 6 is expected to move northward into the morning of the 28th, and then move north-northeast over the next 31 days.
It is expected to become a strong force on June 1st and take a northerly course
to advance south of Okinawa.



After that, there is a possibility that the course will change to the east, so
Please pay attention to the latest typhoon information in the Honshu area.

Today, the 27th (Wednesday), there is a risk of a linear precipitation band occurring in Kagoshima Prefecture, so be careful

2026/05/27 11:17

Currently, there is a low pressure system in the East China Sea with a front that is moving eastward.
A front extending from a low pressure system is extending through southern Kyushu to the south of Japan, and there are places in southern Kyushu near the front that are experiencing extremely heavy rain accompanied by thunder.
In Sata, Minami-Osumi-machi, Kimozuki-gun, Kagoshima Prefecture, extremely heavy rain of 73.0mm was observed in the hour until 8:34.

This low pressure system will pass through Kyushu today, Wednesday night, the 27th. Atmospheric conditions are expected to become unstable in southern Kyushu and the Amami region as warm, humid air flows toward the low pressure system and front. There will be very heavy to heavy rain with localized thunderstorms.



The Japan Meteorological Agency has issued general weather information regarding heavy rain, stating that there is a possibility that a linear precipitation band will form in Kagoshima Prefecture (excluding the Amami region) and the Amami region today, and the risk of heavy rain disasters will rapidly increase.

In Kagoshima Prefecture (excluding the Amami region) and the Amami region, please be on alert for landslides from late afternoon to early evening today, the 27th.

In Kagoshima Prefecture (excluding the Amami region), there is a possibility that a linear precipitation band will continue to form into the evening of today, the 27th, and in the Amami region, until the evening of today, the 27th, and the risk of heavy rain disasters will rapidly increase.
Please pay attention to the latest disaster prevention weather information that will be announced in the future.



[Rain Forecast]
The expected rainfall per hour on the 27th is high in places
Kagoshima Prefecture (excluding the Amami region) 50mm
Amami region 50mm

From 12:00 on the 27th to 12:00 on the 28th The predicted 24-hour precipitation is high in some places,
Kagoshima Prefecture (excluding the Amami region) 80mm
Amami region 100mm
If a linear precipitation band occurs, there is a risk that the rainfall will increase locally.

The following are the regions and periods where linear precipitation bands may occur and the risk of heavy rain disasters may rapidly increase.
Kagoshima Prefecture (excluding Amami region) Towards the evening of the 27th
Amami region Towards the evening of the 27th

[Disaster prevention matters]
Strict warning: Landslides
Precautions: Flooding of low-lying land, rising river water, lightning strikes, gusts of wind

Due to the influence of fronts and low pressure, barges occur in the east of Japan [Marine summary (May 17-23, 2026)]

2026/05/27 01:33

On May 23rd, a front extending from the south of Japan to the east of Japan and the low pressure above the front strengthened the winds, causing a storm to blow over the east of Japan.
Sea surface temperatures in the Japanese waters continued to be significantly higher than normal in the central and western regions, and were up to 4 C higher on the continental side.

Below is a summary of the ocean (May 17-23, 2026).



#Pressure distribution and waves
On the 17th and 18th, a front extended south of Japan, and there was a large gradient in pressure between it and the high pressure near Japan, and waves rose south of Okinawa.
On the 19th, a low pressure system moved northward near Okinawa, causing waves to rise.
On the 20th, a low pressure system accompanied by a front moved eastward near the Yellow Sea, causing waves to rise.
On the 21st, a low pressure system in the western Japan Sea moved eastward. A front extended east to west around western and eastern Japan. Waves rose in the Sea of Japan and the southern coast of Honshu.
From the 22nd to the 23rd, the front extended from central China to the Nansei Islands to the east of Japan, and the low pressure above the front moved eastward. There was a large pressure gradient between the front and low pressure system and the high pressure system to the north, causing waves to rise in the Sea of Japan and east to south of Japan. On the 23rd, it broke out in the east of Japan.



#Sea surface temperature
Sea surface temperatures in the central and western regions of Japan continued to be significantly higher than normal in the central and western regions, and were up to 4 C higher on the continental side.
In the East China Sea, areas that were much warmer than normal expanded, and were up to 4 C warmer.
The waters near the Nansei Islands remained at normal levels, while the waters south of Japan continued to be slightly higher than normal.
The waters off the coast of the Tokai region were at normal levels, and the waters east of the Kanto region continued to be significantly higher than normal, with temperatures up to 4 C higher than normal.
The area off the coast of Sanriku, which is much lower than normal, has shrunk.
The sea off the southeastern coast of Hokkaido was lower than normal, and the waters near the Kuril Islands and the Sea of Okhotsk remained near normal.

Weather forecast for today, the 26th (Tuesday): It will gradually rain in Kyushu and Shikoku, and there will be very heavy rain in Amami.

2026/05/26 12:13

A front will extend over the southern coast of Kyushu in the afternoon of today, the 26th (Tuesday). Amami is likely to experience locally heavy rain into the evening. There is also a possibility that linear precipitation bands may occur. Rain will spread across Kyushu from around noon, and there will also be more places in Shikoku to experience rain. From the evening onwards, there is likely to be some showers in parts of inland eastern Japan.



Today, the afternoon of the 26th (Tuesday), a front is extending near Kyushu. Warm, humid air is flowing toward the front, and rain clouds and thunderclouds are developing near Amami.
Amami will experience locally heavy to very heavy rain into the evening. Until the afternoon, there is a risk that a linear precipitation band will form and the risk of heavy rain disasters will increase rapidly.



Rain will gradually spread in Kyushu from around noon. It will rain in Shikoku from the evening onwards, and rain gear will be needed in many parts of the country at night.
It will be sunny in many parts of Honshu, but from the evening onwards there will be some showers in inland areas of eastern Japan. In addition, there is a possibility of light rain in parts of northern Hokkaido at night.


The maximum temperature is expected to be above normal in many places today. Temperatures are expected to be around 28 degrees Celsius widely in the Kanto region and west, with midsummer days expected to reach 30 degrees Celsius or higher in some places, mainly in western Japan. In Tohoku, there are places inland where the temperature approaches 30c, and in Hokkaido, there are places in the northern part and the Sea of Okhotsk where the temperature exceeds 25c. Please take precautions against the heat, such as hydrating frequently.

A typhoon egg lies in the sea far south of Japan. Will a new typhoon occur in the future

2026/05/26 08:09

A cluster of clouds can be seen gathering over the ocean near the Caroline Islands, far south of Japan. This cloud mass is analyzed as an L mark (low pressure area) on the Asia-Pacific region weather map as of 3 a.m. today, but there is a possibility that it will develop into a tropical cyclone by tonight.





Looking at the forecast after that, the forecast map at 9pm on the 27th shows that it is predicted to be a typhoon. Sea surface temperatures in this area are high enough for tropical cyclones or typhoons to develop, and they are expected to continue to develop.



Looking at the weather map for the coming week, a "low" mark can be seen over the sea south of Japan from around the 30th (Saturday). It is expected to gradually move northward, and may approach Japan from the end of May to the beginning of June.

As of 8 a.m. today, the 26th, no typhoon information has been announced yet, but depending on future forecasts, it could have a major impact on the weather around Japan. Please pay attention to the latest information that will be updated in the future.