Tomorrow 1st (Wednesday), the new year starts with rain in western and eastern Japan. Be careful of temperature drop due to rain.

2026/03/31 21:47

The new fiscal year begins tomorrow, April 1st. The first day of the new fiscal year in western and eastern Japan is likely to see heavy rain over a wide area.

The low pressure system that brought rain over a wide area on the 31st is moving away to the east of Japan. However, a new low pressure system has formed on the front extending from the low pressure system, and will approach south of Kyushu tomorrow morning.



It will rain in many places in the Nansei Islands from early morning, and in Kyushu, Chugoku, and Shikoku by morning. Please be aware that in the Nansei Islands, there is a risk of heavy rain with thunder into the afternoon.



As the low pressure system moves east near the southern coast of Honshu, the area of rain will gradually spread to the east. It will rain in the Kinki and Tokai regions around noon, and heavy rain will start in the Kanto-Koshin and southern Tohoku regions from mid-afternoon to evening.
Don't forget your umbrella even if it's not raining when you go out in the morning. In the Kanto region, the timing of heavy rain may coincide with the time you return home, so be sure to check the latest weather information.



In western Japan, there will be places where the temperature will drop significantly from the 31st due to the effects of rain. In Shikoku, on the 31st, there were some places on the verge of midsummer, with temperatures reaching 29.3 degrees Celsius in Anabuki, Mima City, Tokushima Prefecture, but on the 1st, temperatures were expected to reach 15 degrees Celsius in Tokushima and Takamatsu, and there are likely to be places where the temperature will drop nearly 10 degrees Celsius from the previous day. In the Kanto and southern Tohoku regions, the effects of a low pressure system will continue into the 2nd, and temperatures will be lower than normal on the 2nd due to rain.
Please choose your clothes carefully and be careful not to get sick from the beginning of the new year.

[Marine Summary] Heavy turbulence in the south of Japan due to low pressure; sea surface temperature in the Sea of Japan 5c higher than normal (March 22-28, 2026)

2026/03/31 16:40

Due to the effects of a low pressure system and a front, waves in the south of Japan were severe with wave heights of more than 6 meters. In addition, sea surface temperatures in the waters of Japan expanded in areas where the sea surface temperature was higher than normal, reaching a maximum of 5 C above normal on the western continental side.
Below is a summary of the ocean from March 22nd to 28th, 2026.



#Pressure distribution and waves
On the 22nd, the gradient in pressure increased between the low pressure east of the Kuril Islands and the high pressure east of Japan, and the pressure gradient increased in the east of Japan.
On the 24th, the pressure gradient between the high pressure system in the Sea of Japan and the low pressure system east of Japan increased, causing waves to become higher east of Japan.
From the 25th to the 27th, a low pressure system moved eastward from the south of Japan to the east of Japan.
On the 26th, waves rose in the East China Sea and from the south of Japan to the east of Japan, causing waves in the south of Japan to exceed 6 meters in height.
On the 27th, there were areas in the east of Japan where barge conditions continued.
On the 28th, the pressure gradient between the low pressure system far east of Japan and the high pressure system east of the Kuril Islands increased, and high waves continued in the east of Japan.



#Sea surface temperature
Sea surface temperatures in the Japanese sea area were higher than normal by an expanding area, and were up to 3 C higher than normal in the northern and central regions, and 5 C higher on the western continental side.
In the East China Sea, the area of higher than normal waters has shrunk.
The waters around the Nansei Islands continued to be at normal levels.
Continued to be at normal levels in the south of Japan, and slightly below normal levels off the coast of the Tokai region and south of the Kanto region.
To the east of Kanto, sea areas continued to be warmer than normal, with temperatures up to 3 C higher than normal.
Off the coast of Sanriku, sea conditions continued to be lower than normal.
The sea area around Hokkaido was normal, and sea ice moved south into the sea near the Chishima Islands and the Sea of Okhotsk.

Today's weather is rough on the Pacific side of eastern Japan. Tomorrow, the weather will be downhill again from the west.

2026/03/31 09:07

There is a low pressure system with a front near the Tsushima Strait, and it is moving east-northeast. Warm, humid air was flowing toward fronts and low pressure systems, causing rain clouds to develop and record-breaking heavy rain in some places in western Japan.

In Hiwasa, Minami Town, Tokushima Prefecture, 79.0 mm of precipitation was observed per hour. In addition, the 12-hour precipitation up to 7:40 was 165.0 mm, both of which were the highest in March.
Although the rain has already stopped in many places in western Japan, as of 9:00 a.m., a heavy rain warning (flooding damage) has been announced in southern Tokushima Prefecture.



After this, the low pressure system will move through the Sea of Japan and pass near northern Japan. As a result, rain clouds are expected to spread to eastern and northern Japan.

Especially on the Pacific side of eastern Japan, the atmospheric conditions will become unstable as warm, humid air flows towards fronts and low pressure systems, leading to the formation of rain clouds and heavy rain accompanied by thunder in some places.
In addition, the wind will become stronger, especially in coastal areas, which may cause transportation delays. Please check the latest information.

It will continue to rain in some places in eastern Japan until the night of Tuesday, April 31st, and in northern Japan until the morning of Wednesday, April 1st, but it will gradually stop.



However, tomorrow, April 1st (Wednesday), a low pressure system will form in the East China Sea above the front and move eastward along the southern coast of Honshu. As a result, the weather is expected to be downhill from the west. It will start raining again in Kyushu in the morning, and the rain will gradually spread to western and eastern Japan by the afternoon.
Tomorrow will be the start of a new fiscal year, but unfortunately the weather is likely to be bad. Please don't forget your rain gear.

Weather for today, the 31st (Tuesday): Rain is expanding from the west; heavy rain warning mainly on the Pacific side

2026/03/31 06:36

On today, the 31st (Tuesday), the last day of this fiscal year, a low pressure system accompanied by a front will move through the Sea of Japan and pass near northern Japan. Additionally, a front extending from the low pressure system is expected to pass through western and eastern Japan. Be careful of heavy rain, especially on the Pacific side.



Due to the effects of low pressure and fronts, it has been raining over a wide area in western Japan since the morning, and there are places with heavy rain mainly on the Pacific side. Please be careful of landslides, flooding of low-lying areas, rising water levels and flooding of rivers, etc. In the afternoon, the rain clouds will dissipate as the low pressure system and front move eastward, and in many places it will stop by the afternoon.

In eastern Japan, the area of rain will gradually spread and it will rain widely. Be careful of heavy rain and thunderstorms, especially on the Pacific side. In addition, the winds are strong, especially in coastal areas, and there are places where the winds can hit the ground sideways, so it's best to give yourself plenty of time when commuting to work or school.

The weather is also going downhill in northern Japan. It starts raining around noon in Tohoku, so please bring rain gear even if it's not raining when you go out. Rain is expected to start falling in Hokkaido at night, mainly on the Pacific side. If you are returning home late, it may be a good idea to have a folding umbrella handy.

Even though there is little sunlight in each region, temperatures are expected to remain high. In many places, the temperature will be similar to that of mid- to late April, and in some places in western Japan, Osaka is expected to have temperatures of 25 degrees Celsius and a summer day. In eastern Japan, there are many places where the temperature is around 20 degrees Celsius, making it a relatively pleasant experience.

Warning-level heavy rain in western and eastern Japan into tomorrow. Widespread rain on April 1st; warning-level heavy rain again on weekend [Latest weekly weather forecast]

2026/03/30 12:29

The weather is going downhill from the west until tomorrow, the 31st (Tuesday).
There is a risk of heavy rain reaching a warning level over a wide area in western and eastern Japan.
The next day, April 1st (Wednesday), there will be many entrance ceremonies, but it will be raining widely, and there will still be some rain on the 2nd (Thursday).
Then, on the 3rd (Friday), the weather was once again downhill from the west.
It will rain widely on the 4th (Saturday), and due to the influence of a developing low pressure system, there is a risk of warning-level heavy rain mainly in southern Kyushu.
On the 5th (Sunday), there will be some rain in eastern and northern Japan.





#There is a risk of extremely heavy rain like waterfalls in Kyushu today
Today, the 30th (Monday), a front is extending from the continent to the vicinity of the Nansei Islands, and the low pressure system above the front is moving eastward over the continent.
Due to the influence of the front, it has started raining early in the morning in parts of Okinawa and Kyushu.
Even in eastern Japan, before a low-pressure system or front approaches, there are places where it is raining, mainly on the Pacific side, due to the influence of moist air circulating around the edge of the high-pressure system to the east of Japan.
In the afternoon, the front is expected to extend to the vicinity of Kyushu, and the low pressure above the front is expected to move toward the Tsushima Strait.
Atmospheric conditions will be unstable in Okinawa and western Japan due to the influence of warm, humid air heading toward the low pressure system and front.
There is a risk of heavy rain in southern Kyushu from the afternoon and in northern Kyushu from the evening, with localized thunderstorms and very heavy rain like waterfalls or heavy rain like an overturned bucket.
It will start raining in Shikoku and Chugoku at night, and there will be some places in the Kinki region late at night.
You need to be careful about sudden heavy rain in Shikoku.
The high pressure system east of Japan will move away from Japan, and the front and low pressure system will approach from the west, so showers are expected in eastern Japan and the Tohoku region.
In Hokkaido, due to the influence of a low pressure system near Primorye, there will be places on the Sea of Japan side where it will start to rain late at night.



#There is a risk of warning-level heavy rain in western and eastern Japan into tomorrow.
Tomorrow, the 31st (Tuesday), this low pressure system is expected to pass through the Tsushima Strait and the Sea of Japan, pass through Honshu, and then move off the coast of Sanriku.
In the morning, it will rain west of the Tokai region, and there will be some places in the Kanto-Koshin and Hokuriku regions as well.
Rainfall is expected to spread to the southern Tohoku region before noon and to the northern Tohoku region in the afternoon.
There will be places in Kyushu and Shikoku where the rain will stop at night, and there will be places where it will rain or snow in southern Hokkaido late at night.
Until noon in southern Kyushu and into the early morning in northern Kyushu, extremely heavy rain with localized thunderstorms, like waterfalls, or heavy rain like an overturned bucket will fall, and there is a risk that heavy rain will continue.
There will be places in Shizuoka Prefecture where it will rain heavily.
There is a risk of warning-level heavy rain in Kyushu, Shikoku, and Chugoku from the night of today, the 30th (Monday) to tomorrow, the 31st (Tuesday), and from the morning of tomorrow, the 31st (Tuesday), in the Tokai, Kanto, and Hokuriku regions.
Also, due to the influence of the front and low pressure, the winds will become stronger over a wide area, and if the low pressure develops more than expected, it will become a warning-level storm in the Pacific side of Kyushu, Shikoku, Kinki, and southern Tohoku.

Today, the 29th (Sunday), it will be sunny in a wide area, but be careful of showers on the Pacific side in the afternoon.

2026/03/29 12:34

Today, the 29th (Sunday), the area around Japan is covered in high pressure, and many places are sunny. It has already been announced that cherry blossoms will be in full bloom in some areas from western Japan to eastern Japan, making it a perfect day for cherry blossom viewing, but after this, there is a possibility of showers in places on the Pacific side, mainly in the afternoon. Rain is expected to be accompanied by thunder in some places, so please be aware of changes in the sky when going out.



Today, the 29th (Sunday), the area around Japan is covered in high pressure, and many places are sunny, but from Shikoku to the Kanto area, there is a trough of pressure between two high pressure systems centered around northern Japan and east of Japan. As warm, humid air flows in around the edge of the high-pressure system east of Japan, atmospheric conditions will become extremely unstable in some places, especially on the Pacific side, until the morning of tomorrow, the 30th (Monday).
As a result, rain clouds are expected to develop in places from the afternoon.





Sudden heavy rain and thunderstorms are expected in some places.
If there are signs of a developing cumulonimbus cloud approaching, please take every precaution to ensure your safety, such as moving inside a building.
Even in places where the sun is shining and it's a good day for cherry blossom viewing, it's a good idea to pay attention to changes in the sky and have a folding umbrella ready when you go out.

Weather for the week: susceptible to low pressure and fronts, rain is expected over a wide area from Kyushu to Tohoku from around the 31st to the 1st

2026/03/29 07:33

From now on, the area around Honshu will be susceptible to the effects of low pressure and fronts. There is a possibility that the rain will become stronger with localized thunderstorms, and heavy rain is likely to occur in some places. Okinawa is expected to continue experiencing rainy days into next weekend.



Tomorrow, the 30th, the high pressure system is expected to gradually move east of Japan, and a low pressure system with a front from the continent will approach. Rain clouds will approach from the west, and the weather will turn downhill in Kyushu, Chugoku, and Shikoku.

The low pressure system is expected to continue to develop and move along the Sea of Japan side tomorrow, the 31st. Another low pressure system will move in from the west on the 1st.
For this reason, from the 31st of the month to the first day of the month, there will be heavy rain over a wide area from Kyushu to Tohoku, and the wind will be strong and the weather will be rough. There is a risk of heavy rain with localized thunderstorms. Even if the rain stops on the Pacific side of western and eastern Japan, caution is needed as there is a risk that the rain will become heavier again. The effects may continue around the Kanto region until around the 2nd.

3It will be sunny in many places around the time due to high pressure. However, as the next low pressure system or front approaches, there is a possibility that the weather will deteriorate widely from the west again around the 4th. If you have plans for next weekend, please keep an eye on the upcoming weather information.

At the beginning of the week, around the 30th and 31st, temperatures will tend to be higher than normal, and in some places it will be as warm as May. From the middle of the week, temperatures are expected to settle down to normal levels in many places due to the effects of rain.

News of cherry blossoms in full bloom arrives in Tokyo Tomorrow, the 29th (Sun), is a good day for cherry blossom viewing, so there may be new news of cherry blossoms in full bloom.

2026/03/28 21:02

From western Japan to eastern Japan, cherry blossoms are blooming and are in full bloom.

Today, the 28th (Saturday), it was announced that cherry blossoms will be in full bloom in Tokyo. Full bloom was announced 3 days earlier than normal and 2 days earlier than last year.
On the same day, the blooming of cherry blossoms was announced in Tottori and Tokushima. In Tottori, the flowers bloomed one day earlier than normal and one day later than last year, and in Tokushima, they bloomed two days later than last year, the same as in normal years.



Tomorrow, the 29th (Sunday), the area around Honshu will be widely covered in high pressure, and many places will be sunny during the day. The maximum daytime temperature will exceed 20c in many places from western to eastern Japan, making it warmer than normal and allowing you to enjoy cherry blossom viewing without the need for a jacket. It seems that there are some places where we will receive news that the cherry blossoms are in full bloom.
In Tohoku, there are many places where the temperature will exceed 15c, and in Hokkaido, the temperature will rise to nearly 15c, and in many places it will be as warm as mid to late April.

However, from western Japan to eastern Japan, there is a trough of pressure between high pressure centers centered on the Sea of Japan and Pacific Ocean sides. The weather is likely to change rapidly in the afternoon as the atmospheric conditions become unstable due to the influence of humid air. Localized rain clouds tend to develop inland and along mountains, so even in areas where there is no rain symbol in the weather forecast, there is a possibility that the weather will temporarily deteriorate in a small area.
If you are enjoying cherry blossom viewing, please be careful of changes in the sky, such as sudden rain or thunderstorms. It would be a good idea to bring a folding umbrella with you when you go out.

Clouds tend to spread in Hokkaido, and there is a possibility of rain or wet snow in some places. Don't forget your umbrella when you go out.
Due to the influence of the front, rain will gradually fall near Okinawa and the Sakishima Islands. Please pay attention to the direction of the rain, as the rain may become heavier in some areas.

Beware of sudden changes in weather for cherry blossom viewing on weekends. Heavy rain is expected to occur early in the week. Widespread rain on April 1 [Weekly Weather Forecast]

2026/03/28 13:04

Weekly Weather Forecast
# Weekends are good days for cherry blossom viewing, so be careful of sudden changes in the weather
# Weather is going downhill from the west at the beginning of the week, with risk of warning-level heavy rain for western and eastern Japan
# Widespread rain on April 1st
# Higher temperatures than normal, cherry blossoms continue to bloom, be careful of damage from melting snow and pollen





#Weekends are good days for cherry blossom viewing, but be careful of sudden changes in the weather
Over the weekend from today's 28th (Saturday) to tomorrow 29th (Sunday), a front will extend from the continent to the East China Sea, and the Nansei Islands will be cloudy, with rain expected in places.
The area around Honshu is covered by high pressure, and it is expected to be sunny in many places.
The cherry blossoms are in full bloom in some places, and it looks like it will be a good day for cherry blossom viewing in western and eastern Japan.
However, atmospheric conditions will be unstable in the afternoon due to warm, humid air and cold air above.
Be careful of sudden changes in the weather, and be careful of sudden heavy rain, lightning strikes, and gusts of wind.
When enjoying the cherry blossoms outside for a long time, it is a good idea to bring rain gear just in case.
In Hokkaido, there will be some places in northern Hokkaido where it will rain due to the passage of a pressure trough.



#The weather will be downhill from the west at the beginning of the week There is also a risk of warning-level heavy rain in western and eastern Japan
The front will extend from the East China Sea to the vicinity of Kyushu on the 30th (Monday), and the low pressure above the front will move eastward through the East China Sea.
The rain is expected to spread from the west, and it is expected to gradually start to rain from Okinawa to the Tokai region.
On the 31st (Tuesday), a low pressure system accompanied by a front will move towards western Japan.
The rain is expected to spread from Okinawa to Tohoku.
When a low pressure system or front passes, the rain and wind will increase.
Western and eastern Japan is likely to experience heavy rain and rough weather due to the developing low pressure system.
There is a risk of warning-level heavy rain in southern Kyushu from the 30th (Monday) to the 31st (Tuesday) and in Shizuoka Prefecture on the 31st (Tuesday).
Please pay attention to the latest weather information.



#4/1 will also have widespread rain
I think there will be many places where induction ceremonies will be held on April 1st (Wednesday), and it will rain widely.
The low pressure system is expected to pass through northern Japan and move off the coast of Sanriku.
There will be times when it rains from Okinawa to Tohoku.

#Higher temperatures than normal; cherry blossoms are blooming; watch out for damage from melting snow and pollen
Temperatures for the next week are expected to be at or above normal. On the weekend, the temperature will rise to around 20 degrees Celsius in many places, especially in western and eastern Japan, and it looks like it will be warm like spring.
With this warm weather, cherry blossoms will begin to bloom, and the Tokai and Kanto regions will experience a rush to see them in full bloom starting this weekend.
In Kyushu to Kanto, cedar pollen levels are reaching their peak, but there are some places where cypress pollen is starting to appear.
Hokuriku to Tohoku are reaching their peak of cedar pollen.
On days when the temperature is high after rain, pollen tends to fly, so please be careful about large amounts of pollen being scattered.
As the trend of high temperatures continues, please be careful of damage from melting snow in areas with heavy snowfall.

Weather for today, the 28th (Saturday): Widespread sunny weather making it a good day to go out. Beware of sudden weather changes in the Kanto region.

2026/03/28 06:22

Today, the 28th (Saturday), the area around Japan will be covered in high pressure and it will be sunny in many places. On the other hand, there are places in the Kanto region where it rains until the morning, and you need to be careful about weather changes in the afternoon as well.



Clouds tend to spread over Hokkaido, and there will be places with showers and snow mainly on the Sea of Japan side. It's safe to have a folding umbrella when you go out.
The sky in northern Tohoku is also dominated by clouds. Please be careful as there is a possibility of showers in the afternoon.

There will be some places in the southern part of the Kanto region where the rain will remain until morning. The weather is expected to improve during the day and there will be time for sunshine to reach us. However, in the afternoon, rain clouds are likely to develop mainly along the mountains, and thunderstorms may occur in some places. Please be aware of changes in the sky when you go out.

From the Tokai region to the west, there are many places where the sun can reach a wide area and it is sunny. The temperature is rising, and it looks like it's going to be a cheerful time to enjoy going out. There is a possibility of showers in the Kinki region and parts of China in the afternoon, so please be careful when going out.

Okinawa's main island will receive sunshine, but the weather is expected to be prone to rain, especially in the Sakishima Islands.