One-month forecast: The extreme heat will subside for a while, with many cloudy and rainy days expected during Golden Week

2026/04/24 21:36

On the 23rd (Thursday), the Japan Meteorological Agency announced the latest one-month forecast, which shows the weather outlook for the next month.



According to the forecast results of the forecast model, there is an anticyclone to the east of Japan, and the area of high pressure is expected to extend to the vicinity of Japan. Northern Japan will likely be covered by high pressure. In addition, a weak pressure trough is expected in the south of Japan, and it is expected that moist air will easily enter the Pacific side of western and eastern Japan. The temperature at an altitude of approximately 1,500 meters will be higher than normal nationwide, and it will likely be covered by warm air.



The average temperature for the next month will tend to be higher than normal nationwide across the country. However, from the end of April to the beginning of May, the probability that the average temperature will be around normal and the probability that it will be higher than normal are about the same, and the chances of extreme heat or cold are low. During Golden Week, the temperature is likely to be relatively comfortable.
From mid-May onwards, it will become hotter nationwide, so it will be essential to take precautions against heatstroke, such as staying hydrated and taking adequate breaks.



The weather will change every few days. Precipitation for the month is expected to be at normal levels nationwide, but western and eastern Japan is likely to experience many cloudy and rainy days, especially on the Pacific coast. During the Golden Week period, low pressure systems and fronts often pass from the west, and around the 30th, a developed low pressure system may approach and bring widespread rain to the Pacific side of western and eastern Japan. Also, rain is likely to increase in many places for the next 3 to 4 days due to the effects of low pressure and fronts.

Currently, forecasts vary widely, and there is great uncertainty regarding the timing, extent, and strength of rain, but please be sure to check the latest weather information before going out.

[Kanto/GW weather] It rains every 3 days, and if it's sunny it's summer, when is the best time to go out (Commentary: Weather forecaster Junko Miyake)

2026/04/24 14:48

Golden Week may start as early as tomorrow for some people.
Let's take a look at the key points regarding the weather during the holidays in the Kanto region.
The weather changes periodically, and there are likely to be days when the rain and wind become stronger.
It looks like the temperature difference will be severe again.
Compared to previous years, this year's Golden Week is characterized by rapidly changing weather.



First, let's look at the weather map from tomorrow.
Tomorrow, the 25th (Saturday), will be covered by a mobile high pressure system.
In the Kanto region, there are many places where it is mild and sunny, but
the high pressure is slightly biased to the north, so it is likely that there will be periods of cloudy weather on the Pacific side and coastal areas of the Kanto region,
where moist air tends to flow in.



The next day, on the 26th (Sunday), a low pressure system and front will approach from the west.
It looks like clouds will gradually spread in the Kanto region.
On the 21st (Monday), a low pressure system will develop as it passes through the Kanto region.
There will likely be periods of strong rain and wind.



Let's take a look at the forecast weather map for the 28th (Tuesday) onwards.
On the 28th (Tuesday), a low pressure system will approach northern Japan, so
it will rain in northern Japan, but there will be many sunny spells in the Kanto region.
29th (Wednesday) Showa Day will also be covered by high pressure from the north, so it looks like there will be many sunny spells.

From the 30th (Thursday) to May 1st (Friday), the
low pressure system is expected to develop considerably and pass near Honshu.
For this reason, there is a possibility that the weather in the Kanto region will be a little rough with strong rain and wind.
There is a possibility that the lowest pressure will develop during the holidays, so please check the latest forecast for the daily weather from the 30th onwards.

On the 2nd (Saturday), there will be many areas covered in high pressure that will be sunny.
This Saturday, the 2nd, it looks like there will be many parts of the country that will be mildly sunny.
On the 3rd (Sunday), a low pressure front will approach from the west again.
As you can see, the weather is changing rapidly during this year's Golden Week.



Let's take a look at the forecast for the next 10 days.

It will be sunny in many places tomorrow and the following Saturday and Sunday.
However, it looks like it will be quite cold in the mornings and evenings due to the cold air in the sky.
Please stay warm.

There are rain marks in the Kanto region every three days, on the 27th (Monday), the 30th (Thursday), and May 3rd (Sunday).

The weather changes periodically, and the temperature changes are likely to be quite large.
There are sunny days when the temperature rises to around 25 degrees, but there are also days when it rains and it feels quite chilly, reaching around 18 degrees.

Please pay close attention to the daily temperature differences as well as the temperature differences within the day.



It is said that if the temperature changes by 5 degrees, you will change one outfit.
When the weather is sunny during the day, I think I can wear short sleeves, but
Mornings and evenings can get a bit chilly, and there are days when I need a cardigan or trench coat.
Please pay attention to the relationship between temperature and clothing.


During the day, the temperature can reach up to 25 degrees, so you may be able to wear short sleeves, but
Mornings and evenings can get a bit chilly, so you'll need a cardigan or trench coat.
Spend this Golden Week wearing clothes that are easy to put on and take off.

[Latest Golden Week Weather] Periodic rain and large temperature differences. When is the best time to go out (Commentary: Weather forecaster Atsuko Miyake)

2026/04/24 14:15

There may be some people who say Golden Week starts as early as tomorrow.



Now, let's take a look at the key points regarding the weather during Golden Week.
This year's Golden Week, the weather will change periodically,
There will likely be days when the rain and wind are strong.
Also, the temperature difference is likely to be severe.

Compared to Golden Week in previous years,
this year's Golden Week is characterized by rapidly changing weather.



Let's take a look at the forecasted weather map for three days starting tomorrow, the 25th (Saturday).

First of all, tomorrow, the 25th (Saturday), will be covered by a mobile high pressure system,
which will likely be sunny in many places.
Also, the wind is weak and it looks like it will be calm.
However, since the high pressure is slightly biased to the north,
moist air is likely to flow in.
There will be times when clouds will spread across the Pacific side of western and eastern Japan.

The day after tomorrow, the 26th (Sunday), a
low pressure front will approach from the west.

On the 26th (Sunday), it will rain mainly in western Japan,
There will also be cold air in the sky,
There will be heavy rain accompanied by thunder in some places.

In addition, the low pressure system is expected to develop slightly until the 27th (Monday) as it moves along the Pacific side of the Kanto and Tohoku regions.

As a result, it is likely that rain and wind will become stronger in some places,
Eastern Japan and the Tohoku region.



Beyond that, let's take a look at the forecast weather map for
28th (Tuesday) onwards.

On the 28th (Tuesday), another low-pressure system will approach northern Japan, and the rain is likely to increase in places,
mainly in Hokkaido.

The 29th (Wednesday) Showa Day will be covered by a mobile high pressure system, and
the weather will temporarily recover, but
a low pressure system and front will soon approach from the west,
and areas such as Kyushu are expected to experience rain.

From Thursday, May 30th to Friday, May 1st, a
low pressure system is expected to develop and pass near Honshu.
The rain and wind are expected to intensify over a wide area.

The area of low pressure that will develop the most during Golden Week this year is likely to be from the 30th (Thursday) to the 1st (Friday).

On the 2nd (Saturday), the weather will improve due to high pressure.
It looks like the weather will be sunny nationwide only on Saturday the 2nd.

On the 3rd (Sunday) Constitution Day, the weather is once again downhill from the west.
A low pressure system or front is expected to approach.




Let's take a look at the forecast for the next 10 days.
From now on, the weather will change periodically,
with rain marks appearing every few days.

On the 2nd (Saturday), there are clear skies all over the country, and it looks like it will be a pleasant and sunny day.

On this day, you can feel the early summer cheerfulness typical of Golden Week.

However, the weather is expected to be a bit changeable on other days, with rain falling somewhere.



Please check the latest weather frequently before going out.

If you pay attention to the temperature, it seems that the difference in temperature from day to day,
and within, will be large.

There are likely to be summer days when the temperature exceeds 25 degrees during the day, but there are also days when the temperature in the morning and evening is around 10 degrees.




It is said that if the temperature differs by 5 degrees Celsius, you will wear one different outfit.

Please refer to this relationship between temperature and clothing.

There are days when you can wear short sleeves during the day, but there are also days when you need to wear a cardigan or trench coat in the morning and evening.

Please enjoy Golden Week by paying attention to temperature differences.

Tomorrow, the 25th (Saturday) is a chance to dry outside, and the 26th (Sunday) the weather is going downhill from the west.

2026/04/24 12:37

Tomorrow, the 25th (Saturday), will be covered in high pressure and it will be sunny in many parts of the country. In the morning, rain may linger in some areas on the Pacific side of Kyushu and Shikoku, but the weather is expected to improve during the day and the sun will shine. Especially in eastern Japan, the sky will be blue in the morning, making it a perfect day to dry your laundry.

The temperature is about average, and you can feel the refreshing air typical of this time of year. The crisp air makes it easy to dry large items of laundry such as thick clothes, sheets, and towel blankets. If you want to do all your laundry on the weekend, we recommend doing it on Saturday the 25th.



On the other hand, on the 26th (Sunday), the weather will be downhill from the west. As the low pressure system approaches Kyushu, clouds are expected to spread over Kyushu from the morning, and rain is expected to gradually begin. The area of rain will spread eastward as time passes, and it will also rain in Chugoku, Shikoku, and Kinki in the afternoon. The weather in the Kanto region remains cloudy, but the chance of rain increases from the evening onwards.

If you are planning to go outdoors this weekend, please check the latest weather forecast. It's a good idea to bring rain gear just in case.

Weather for today, the 24th (Friday): Sunshine returns widely; watch out for changes in the sky in Hokkaido

2026/04/24 06:23

Today, the 24th (Friday), the low pressure system that brought widespread rain yesterday (23rd) will move away to the east, and sunshine will return to many areas. However, you need to be careful about weather changes in Hokkaido.



Atmospheric conditions in Hokkaido are unstable due to the influence of cold air above. Even if the sun shines during the day, there is a risk of rain clouds forming locally, so please be careful of sudden strong rain or thunderstorms. It will be safe to have rain gear when you go out.

Sunlight will reach a wide area in Tohoku, Hokuriku, and northern Kyushu. During the day, the temperature in many places is higher than the day before, which is typical of this time of year. There is a possibility of showers in parts of the Pacific Ocean such as Kinki and Shikoku at night, so if you will be returning home late, it is a good idea to bring a foldable umbrella.

There will be some places in the Kanto region where the rain will remain until morning. Although there will be a lot of clouds in the morning, the sunshine is likely to return in the afternoon. Please be careful not to leave your rain gear behind when you return.

In southern Kyushu and Okinawa, clouds will likely spread, and there will be some showers. Please bring rain gear when going out.

Typhoon No. 4 moves north from near the Mariana Islands to the sea near Ogasawara. A wide area from the south of Japan to the east of Japan [Marine summary (April 12-18, 2026)]

2026/04/24 01:18

As Typhoon No. 4 moved northward near the Mariana Islands and advanced into the waters near Ogasawara, waves gradually increased in the waters near Ogasawara from the 15th onwards, and from the 17th to the 18th they were strong over a wide area from the south of Japan to the east of Japan.
The following is a summary of the ocean (April 12-18, 2026).



#Pressure distribution and waves
From the 12th to the 14th, a developed low pressure system moved northeast through the Sea of Okhotsk. The pressure gradient around the low pressure area was large, and the waves were rising. On the 12th, there was a barge near the Mamiya Strait, and on the 13th and 14th, it was barged in the Sea of Okhotsk.
15-17 days ago A low-pressure system accompanied by a front moved eastward along the southern coast of Honshu and eastward into Japan. From the 14th to the 18th, Typhoon No. 4 moved northward near the Mariana Islands and moved into the waters near Ogasawara. On the 15th, swells from the typhoon arrived, and waves rose in the waters near Ogasawara. On the 16th, due to the influence of a low pressure system moving along the southern coast of Japan and swells originating from the typhoon, waves rose in the south of Japan, and from the 17th to the 18th, they broke out over a wide area from south to east of Japan.



#Sea surface temperature
Sea surface temperatures in the northern and central regions of Japan continued to be higher than normal in the northern and central regions, and significantly higher than normal in the western regions. Temperatures on the continent were up to 4 C higher than normal.
The East China Sea and the waters near the Nansei Islands were slightly higher than normal.
South of Japan, sea areas continued to be slightly higher than normal.
From the Tokai coast to the south of the Kanto region, the sea area that is slightly lower than normal has shrunk.
To the east of Kanto, temperatures were higher than normal, with temperatures up to 3 C higher.
Off the coast of Sanriku, the sea area continued to be lower than normal, with temperatures up to 4c lower.
The waters around Hokkaido continued to be at normal levels.

3 days without sunshine in spring, changeable weather in the first half of Golden Week

2026/04/23 12:36

There is a saying that goes, "There are no three days of sunshine in spring." As this phrase suggests, the weather in the current season is characterized by being extremely changeable from April to May.

A typical spring weather pattern is expected to continue through the second half of April, with periodic passage of low pressure systems and fronts, and periods of sunshine and rain alternating every few days.



What I'm curious about is the weather during Golden Week. Unfortunately, it is unlikely that we will have stable sunny skies during this year's holidays. At the beginning of the holidays at the end of April, low pressure systems are likely to pass near Honshu, leading to short periods of sunshine and rain. There are days when the sky is covered with high pressure and the weather is calm and sunny, but as the front approaches, the weather can suddenly deteriorate and the rain may become heavier.



Those who plan to spend time in nature such as the mountains or the sea should be especially careful about sudden changes in the weather. In spring, atmospheric conditions tend to become unstable, and thunderclouds can suddenly form even on sunny days. Conditions can change dramatically, such as when visibility suddenly worsens in the mountains or when the wind gets stronger and the waves get higher at sea. For your safety, please check weather information frequently and take reasonable precautions.

Western and eastern Japan is rainy and cool, and there are places on the Pacific side where it is raining heavily with thunder.

2026/04/23 10:32

There is a low pressure system in the East China Sea that is moving eastward.
Also, a warm front is extending through Kyushu to the south of Shikoku, and a cold front is extending to southern China.
Currently, it is sunny in many places in northern Japan, but clouds are spreading from southern Tohoku to Okinawa, and rain is falling over a wide area in western Japan.



Today, the 22nd (Wednesday), rain will fall over a wide area in western Japan due to the effects of low pressure and a front.
Rain clouds are expected to spread over Okinawa and eastern Japan around noon.
Please be aware that on the Pacific side, there is a risk of very heavy rain or heavy rain with localized thunderstorms, and there is a risk of heavy rain.
It will be sunny in many places in northern Tohoku and Hokkaido.
The daytime temperature is likely to be relatively cool and sunny in western and eastern Japan.



Tomorrow, the 23rd (Thursday), many places will be sunny, but there will be a lot of clouds on the Pacific coast of eastern and western Japan and Okinawa, and there will be some places where it will rain.
Temperatures will be lower than normal in some places in northern Japan, but will likely be around normal or slightly higher in many places.





From the day after tomorrow, the 24th (Friday) to the 25th (Saturday), clouds will likely spread across the Kanto region, and it is likely to rain in some areas, but other areas will likely be covered in high pressure and will likely be sunny.
From the weekend on the 26th to the beginning of the week on the 27th (Monday), a low pressure system will move eastward along the southern coast of Japan, so there will be some places where it will rain, mainly in Okinawa and the Pacific side of western and eastern Japan.

Tomorrow will be a day when you won't be able to do without your umbrella, as there is a risk of heavy rain on the Pacific side.

2026/04/22 14:30

The sun is shining in many parts of eastern and western Japan today, and this is likely to be a rare sunny day.
Tomorrow, the rain area is expected to spread from west to east, and the rain will be concentrated over a wide area of the Japanese archipelago.

A low-pressure system with a front near China is slowly moving eastward, affecting Kyushu, Shikoku, and Honshu from tonight until tomorrow. Rain has already begun in parts of Kyushu, and is expected to gradually spread eastward.



What you should pay particular attention to is the way the rain falls, mainly on the Pacific side. As warm, humid air flows toward the low pressure system and front, locally heavy rain is possible.



In some areas, the peak of rain coincides with the time of commuting to work and school, so it is necessary to be careful about the impact on transportation and flooding of roads. Please be sure to bring an umbrella and protect your feet from getting wet when you go out.

High temperatures trend nationwide; the cherry blossom front heads towards Hokkaido; Typhoon No. 4 temporarily develops into a large and ferocious force (weather summary March 29, 2026 - April 4, 2026)

2026/04/22 07:03

This is a summary of the weather for this period (April 12th to April 18th, 2026).

#Summary of the weather for this period (April 12th to April 18th)
The average temperature was well above normal in many locations as the country was easily covered by warm air. During the period, there were many locations where summer days of 25 C or higher were observed, and the temperature remained on par with that from May to June.

Precipitation tended to be below normal in northern Japan, eastern Japan, and Okinawa/Amami, which were easily covered by high pressure. On the other hand, western Japan was susceptible to the effects of fronts and low-pressure systems, so temperatures were slightly above normal, especially in Kyushu.

Sunshine hours were below normal in western Japan, where there were many cloudy and rainy days due to low pressure and fronts, and in some places in Kyushu, such as Fukuoka, it was well below normal. Northern Japan, eastern Japan, Okinawa and Amami tended to have higher than normal temperatures due to the influence of high pressure, and the Sakishima Islands experienced significantly higher than normal temperatures.



[About this period's weather]

#Characteristics of pressure distribution
On the 12th, a low pressure system moved northeast over the Sea of Okhotsk. East and west Japan were covered in high pressure. On the 13th, Typhoon No. 4 became a large and intense force with a central pressure of 905 hPa, moving westward through the Mariana Islands. Near Honshu, a front has stalled from south China to the East China Sea and south of Honshu. On the 14th, northern and eastern Japan was covered in a belt-shaped high pressure system. The front continued to stagnate from the western East China Sea to the south of Honshu, and a low pressure system formed in the East China Sea above the front. On the 15th, the low pressure front moved east-northeast over the sea south of Honshu. On the 16th, it continued to develop as it passed through the Izu Islands and gradually passed into the sea east of Japan. Typhoon No. 4 gradually changed its course to the east and headed north. On the 17th, the area around Honshu was covered by a mobile anticyclone. A new low pressure system has formed in the East China Sea and is moving north. On the 18th, the mobile high pressure system moved away to the east of Japan, and the continental low pressure system approached northern Japan. The low pressure near the East China Sea was almost stationary, and Typhoon No. 4 moved northward over the ocean east of the Ogasawara Islands.

#Precipitation
On the 12th, rain and snow occurred in parts of Hokkaido and northern Tohoku, mainly on the Sea of Japan side. Rain in the Nansei Islands due to the front. On the 13th, Hokkaido experienced localized rain and snow during the day. In Okinawa and Amami, the area of rain expanded due to the influence of the front, and heavy rain was observed on Suwanose Island with an hourly rainfall of 36.5 mm. On the 14th, rain spread across western Japan, including Kyushu, the Chugoku and Shikoku regions, due to the influence of a front and low pressure. On the 15th, it continued to rain in western Japan due to the influence of a low pressure system moving above the front. The area of rain gradually expanded to eastern Japan. On the 16th, due to the effects of a low-pressure system, rain fell mainly from the Tohoku Pacific side to the Kanto coast. In the Sakishima Islands, the rain intensified due to the influence of the front, and heavy rain with 38.0 mm of precipitation per hour occurred on Shimojijima, Miyakojima City. On the 17th, a large area around Honshu was in a high-pressure area, and there was almost no noticeable precipitation, but on the 18th it rained in western Japan, mainly in Kyushu, due to the influence of a low-pressure system stationary in the East China Sea. Rain clouds developed over the Sakishima Islands due to the influence of humid air, and heavy rain was observed on Yonaguni Island on the morning of the 18th, with an hourly rainfall of 96.0 mm.

#Temperature
On the 12th, temperatures from eastern Japan to Okinawa were higher than normal, but temperatures in northern Japan were temporarily lower than normal. On the 13th, early summer air blanketed the skies over Tohoku and western Japan, and summer days were observed at more than 50 locations near Honshu, including Fukushima (26.8c) and Kumagaya (26.4c). On the 14th, temperatures rose from the Kanto region to the Kinki region, with Osaka recording a summer day of 25.6 C. On the other hand, in Kyushu, where it rained, the temperature was lower than average. On the 15th, there was rain in many places, but the temperature did not drop much, and many observation points in Akita and Niigata prefectures recorded the highest temperature of the year (as of April 15th). On the 16th, the weather improved over a wide area, with warm air covering western and eastern Japan. In Nagoya, the temperature was 26.6c, the first summer day of the year. On the 17th, many places were covered in high pressure and sunny, but the morning turned cold due to radiation cooling, resulting in a day with large temperature differences. On the 18th, temperatures rose nationwide due to warm air from the south. In Hokkaido, the blooming of cherry blossoms has been announced in Hakodate, Sapporo, and Obihiro. In Sapporo, the temperature rose to 20.0c, which is comparable to the warmth of late May.