One month forecast: High temperatures will trend nationwide after Golden Week; signs of rainy season in Okinawa and Amami

2026/04/30 20:41

On the 30th (Thursday), the Japan Meteorological Agency announced the latest monthly weather forecast for the next month.



According to the prediction results of the numerical forecast model, the average sea level pressure for one month will be lower than normal in the north of Japan, and low pressure will likely pass north of Japan more easily. On the other hand, there is a trough of weak atmospheric pressure near Honshu. Temperatures at around 1,500 meters above the ground tend to be higher than normal, and the whole country is likely to be covered in warm air.



From now on, the weather in northern Japan will change every few days, but it will be less affected by low pressure systems and fronts, and there will be more sunny days than normal. Precipitation is expected to remain at almost normal levels.
Similarly, the weather from eastern to western Japan is expected to change every few days, and the amount of precipitation and sunshine hours during this period are expected to remain roughly at normal levels.

However, the average temperature will be higher nationwide. After Golden Week ends, there is a strong possibility that temperatures will be higher than normal, mainly in western and eastern Japan, and it is expected to become hot until late May. It will be a summer day with temperatures above 25 degrees Celsius, and depending on weather conditions, some places may even record midsummer days with temperatures above 30 degrees Celsius. To avoid heatstroke, be sure to take precautions against the heat, such as drinking plenty of water and taking regular breaks.

Okinawa/Amami is susceptible to fronts and humid air, and many cloudy and rainy days are expected. In normal years, the rainy season starts around May 10th in Okinawa and around May 12th in Amami. It looks like the rainy season is gradually approaching. Around mid-May, there may be a period when the weather is temporarily less affected by fronts and humid air, but towards the end of May it will again be susceptible to the influence of humid air.
Precipitation is expected to remain at about the same level as usual, but the rain may become heavier at times, so it would be safer to take measures for heavy rain early.

[General weather information] May 1st (Friday) to May 2nd (Saturday) Be careful of lightning, gusts, and sudden strong rain

2026/04/30 18:40

A low pressure system accompanied by a front is located south of Kyushu and is moving east-northeast.
This low-pressure system is expected to move from the Pacific side of western Japan to the Pacific coast of eastern Japan through Friday, May 1st, and proceed as far as the coast of Sanriku on the night of the 1st.
Meanwhile, another low pressure system is expected to form off the coast of Sanin by the morning of the 1st (Friday) and reach the Sea of Japan side of eastern Japan by the evening of the 1st (Friday).


Also, on the 1st, strong cold air is expected to flow into the skies near Honshu with temperatures below -21 degrees Celsius for this time of year. As a result, atmospheric conditions will be extremely unstable from western Japan to eastern Japan.
As a result of this, stormy weather with thunder is expected over a wide area from eastern Japan to western Japan, and if rain clouds develop more than expected or if the developed rain clouds continue to cover the area, there is a possibility of warning-level heavy rain.


Currently, weather information regarding general weather information
regarding lightning, gusts and hail has been announced.

#Period to be careful
Western Japan: From tomorrow 1st (Friday)
Eastern Japan: From tomorrow 2nd (Saturday)

Please be careful of thunderstorms, tornadoes, severe gusts, and sudden heavy rain. If there are signs that a developed cumulonimbus cloud is approaching, please take precautions such as moving inside a building. If cumulonimbus clouds develop, there is a risk of hail, so please be careful when managing crops and agricultural facilities.

There is a risk of heavy rain during commuting hours tomorrow, so be careful of unstable atmospheric conditions.

2026/04/30 12:47

A low-pressure system accompanied by a front is moving eastward over the East China Sea, and it is already raining over a wide area of western Japan. Rainfall is increasing on the Pacific side of Shikoku and Kyushu, as well as in Okinawa Prefecture.

Today, the 30th, the low pressure system is expected to move east along the southern coast of Honshu. In western Japan, it rains easily throughout the day, so you won't be without your umbrella. The area of rain is expected to gradually spread eastward, with rain expected to begin in the evening in the Tokai region and in the Kanto region from night.



Tomorrow, the low pressure system is expected to move further south of Honshu and east of Japan. Additionally, strong cold air for this time of year is expected to flow from eastern Japan to the Kinki region at an altitude of approximately 5,500 meters. As a result, atmospheric conditions are expected to be extremely unstable in eastern Japan from early morning until late at night.



It will be a rainy day, mainly from northern Japan to eastern Japan, and if rain clouds develop more than expected, or if the developed rain clouds continue to hang around for a long time, there is a risk of warning-level heavy rain on the Pacific side.

From the Tohoku region to the Tokai region on the Pacific side, rain is likely to peak on the morning of tomorrow 1st. There is a risk of heavy rain during commuting hours, and transportation may be affected. Please act with plenty of time.

Temperatures in western Japan are similar to those of March; in northern Japan there is a large difference in temperature throughout the day.

2026/04/30 06:46

Today, the 30th (Thursday), it is expected to rain throughout the day in western Japan due to a low pressure system. The weather is expected to go downhill in eastern Japan as well, with the sky likely to be cloudy.



For this reason, from western Japan to eastern Japan, the rise in temperature is slow even during the day, and the temperature is lower than the day before, with most places having a maximum temperature of less than 20c. Temperatures are expected to be similar to late March, mainly in western Japan. It can feel cool during the day, so it's a good idea to wear a jacket or something when you go out.

On the other hand, northern Japan is sunny and sunny. As relatively warm air flows in, temperatures are likely to rise, and daytime temperatures are expected to be similar to mid-to-late May. It gets colder in the morning due to radiation cooling, so please be aware of the differences in temperature throughout the day, such as adjusting your clothing accordingly.

The predicted maximum temperature in each region is Sapporo 18c, Sendai 17c, Tokyo 18c, Nagoya 17c, Kanazawa 19c, Osaka 18c, Kochi 18c, and Fukuoka 17c.

Today's weather on the 30th (Thursday): Rain gear is a must in western Japan; rain starts in the Kanto region from night; mild skies in northern Japan

2026/04/30 06:16

Today, the 30th (Thursday), a low pressure system accompanied by a front is expected to move from the East China Sea to the south of Honshu. As a result, it will rain in western Japan, and rain clouds will spread in eastern Japan into the evening.



Rain gear will be a must for the day in western Japan due to the effects of low pressure.
It will rain over a wide area from the morning, and there is a risk that the rain will be heavier, especially on the Pacific side. It would be a good idea to have a large umbrella when going out.

The weather is going downhill in eastern Japan. Rain will start in the evening in the Tokai region, and in the evening in the Kanto and Hokuriku regions. Even if it's not raining when you go out, please prepare rain gear in time for your return.

On the other hand, northern Japan will be covered in high pressure, with clear skies over a wide area, and the weather will be calm. It looks like the weather will be pleasant and sunny during the day.

The weather will be sluggish across the country as a front passes through. Rain gear will likely be needed more in the second half of Golden Week.

2026/04/29 12:44

The weather from May 1st (Friday) onward in the second half of Golden Week is expected to continue to be unstable, with rain and sunshine alternating over a wide area in short cycles due to the periodic passage of fronts and pressure troughs. There are some sunny days, but they don't last long, and depending on the region, the atmospheric conditions are unstable due to cold air in the upper atmosphere, making it necessary to be careful about sudden changes in the weather.



In northern Japan, there are many cloudy and rainy days, especially in Hokkaido, and the sky is not clear. The sunny spell is expected to be limited to a short period of time. Tohoku and Hokuriku also have many days with sluggish weather, with a high chance of rain.

In the Kanto-Koshin region, there will be many rainy days from tomorrow onwards, and rain is expected over a wide area from tomorrow the 30th to May 1st. The weather is likely to be affected by fronts, and there are likely times when the rain will become heavier.
Please be aware of the impact on transportation and deterioration of road conditions.

In Kyushu, it is expected to be a week of rain and sunshine alternating in short cycles, typical of this time of year.



In terms of temperature, on rainy days the temperature will drop, and some days will feel chilly. On the other hand, in Honshu, where the weather temporarily returns after the rain has stopped, the maximum temperature is expected to be around 25 degrees, and there is a possibility that it will be a summer day in many places. It's going to be a difficult week to choose clothes.
It is also a time when it is easy to get sick due to the large temperature difference between morning and evening and during the day. When going out, it is best to wear clothes that are easy to adjust, such as carrying a thin jacket.

When planning your vacation, please check the latest weather information frequently.

From tomorrow 30th to May 1st, there will be rain over a wide area due to the influence of a low pressure system. There is also the possibility of warning-level heavy rain on the Pacific side.

2026/04/29 11:18

From tomorrow the 30th (Thursday) to May 1st (Friday), a low pressure system accompanied by a front is expected to move eastward from the south of Kyushu to the vicinity of Honshu, causing strong rain and winds over a wide area. There is a risk of warning-level heavy rain, mainly from the Pacific side of western Japan to eastern Japan.



Today, the 29th (Wednesday/Showa Day), a front is expected to extend from the continent to the East China Sea, and a low pressure system will form above the front. The front and low pressure system are expected to move eastward, and clouds will gradually spread over the Nansei Islands and Kyushu, and it will rain over a wide area at night.



Tomorrow, the 30th (Thursday), the low pressure system will pass south of Kyushu with a front. The low pressure system is expected to develop and move eastward along the coast of Shikoku and the southern coast of Honshu from the day after tomorrow until May 1st (Friday). The area of rain will gradually spread to the east.
In particular, rain clouds will develop over the Pacific coast of western and eastern Japan, which are close to the low pressure system, as the low pressure system passes. The rain is expected to increase temporarily and the wind is expected to become stronger.
There is a possibility of heavy rain, so please be careful when going out.




There is a possibility of warning-level heavy rain in Okinawa, southern Kyushu, Shikoku, the Tokai region, and the Pacific coast of Kanto.
Please check the latest information as transportation may be affected.

The area of rain will gradually move eastward, and it will also rain in northern Japan from May 1st (Friday) to May 2nd (Saturday). The weather is expected to gradually improve from the west.
Golden Week may have already begun for some people, but the weather is likely to be rough, so it's a good idea to check the latest information before planning your outings.

Today's 29th (Wednesday/Showa Day) weather: Rain in the Tohoku region until around noon; rain in Kyushu from night onwards

2026/04/29 07:51

There is a low pressure system to the east of Japan, and it is moving east-northeast. A stationary front extends from the continent to the East China Sea. Meanwhile, a high pressure system is expanding from the continent.
Currently, in the Tohoku region, clouds are spreading easily due to the influence of low pressure, and there are places where it is raining.



Today, it will rain in some places in the Tohoku and Hokuriku regions, and there will be some places in Hokkaido from the afternoon onwards.
Even in the Kanto region, clouds will spread easily due to the influence of a low pressure system to the east of Japan, and it will rain in some areas.

Tonight, as a front and low pressure system approach from the East China Sea, it will gradually rain in Okinawa and Kyushu regions, and it will rain over a wide area overnight.



The expected maximum temperature is 24c in Tokyo and 25c in Kagoshima, which is similar to May, but many other regions will be at or below normal. There will be little sunlight and the northerly wind will make it feel cold, so it's a good idea to wear a jacket.

[Tohoku weekly weather / Rain information for Otsuchi Town, Iwate] Rain and thunderstorms tomorrow, be careful of temperature differences (commentary: weather forecaster Atsuko Miyake)

2026/04/28 15:06

The town of Otsuchi in Iwate Prefecture experienced its first rain since the forest fire broke out yesterday.
At this time, rain clouds are approaching from the west.



Looking at the state of the rain clouds at noon,
we see rain clouds with a low pressure area centered over Akita Prefecture.

In the past hour, around Akita City,
weak rain of about 2 to 3 mm per hour has been observed.



Let's take a look at the rain clouds after this.
In the evening, active rain clouds are expected to form in the northern part of Tohoku.
As seen from Otsuchi Town in Iwate Prefecture,
active rain clouds are expected to form slightly to the north.

As it gets late at night, the rain looks like it will stop for a while.

Today, the 28th (Tuesday), rainfall in Otsuchi Town is expected to be 3 to 4 mm.



Yesterday, the 27th (Monday), 1.5mm of rain was observed in Otsuchi Town, so it is expected that
it will rain about twice as much as yesterday, the 27th (Monday).

As the date changes to tomorrow, the 29th (Wednesday/Holiday)
, the rain will weaken once, but cold air will flow into the sky
and it will likely start raining again from dawn tomorrow.

Cold air flows into the sky, making the atmosphere unstable.
There is also a risk of thunder.
It's raining and the soil looks like it's going to be a little moist, but you need to be careful about lightning.


The rain is expected to gradually stop by tomorrow afternoon.
The expected rainfall in Otsuchi Town tomorrow is 7 to 8 mm.

We predict that there will be more rain today than yesterday, and
tomorrow than today.



Now, let's take a look at the weather for the next three days.
In the northern part of Tohoku, heavy rain is likely to continue from today, the 28th (Tuesday) to tomorrow the 29th (Wednesday, public holiday).
Please be careful of thunder.

The southern part of Tohoku is likely to have many sunny days over the next three days.
However, what you need to be careful about is changes in temperature.

In Otsuchi Town, Iwate Prefecture,
today, the 28th (Tuesday), the temperature is likely to rise to around 15 degrees,
tomorrow, the 29th (Wednesday, public holiday), the temperature may not even reach this 10 degrees.

As the temperature difference will be large,
Please take good care of your health.




Now, let's take a look at the weekly forecast for the Tohoku region.
It looks like it will be mostly sunny on the 30th (Thursday).
It looks like it will be a fun and cheerful place to spend time.
The intensity is likely to be greater in the morning and evening and during the day, so please wear clothing that is easy to
.


From the 1st (Friday) to the 2nd (Saturday), a
low pressure system will develop and approach the Tohoku region.
Please pay close attention to the latest information for the 1st and 2nd,
as there is a risk that the rain and wind will intensify.

After the 3rd (Sunday), the weather will be sunny and the weather will be pleasant and sunny during the day.
It's likely to be a bit sweaty and cheerful depending on the location.

[GW Weather] Warning-level heavy rain and stormy weather forecast; be careful of severe temperature differences (commentary: weather forecaster Atsuko Miyake)

2026/04/28 14:04

Some of you may be celebrating Golden Week starting tomorrow, the 29th (holiday).
Let's take a look at the detailed weather ahead.



First, let's take a look at the state of the rain clouds at this time.
Currently, a low pressure system is approaching the Tohoku region, and there are areas where it is raining, mainly in the northern part of the region.
Around Akita City, light rain of about 2 to 3 mm per hour has been observed.



After this, rain clouds are likely to accumulate mainly in the northern Tohoku region from evening to night.
There is a risk of heavy rain in some places.
Although forest fires are occurring in Otsuchi Town, Iwate Prefecture,
1.5mm of rain fell yesterday, the 27th (Monday).

Today, the 28th (Tuesday), 3 to 4 mm of rain is expected to fall.
I think it will rain twice as much as yesterday.



Although some rain is expected until the 29th (Wednesday/Holiday) tomorrow,
it is likely that the rain will become heavier again in the morning of the 29th (Wednesday/Holiday) due to the cold air in the sky.

There is a risk of localized thunderstorms.
It's nice to have a lot of rain, but you need to be careful about lightning.
The amount of rain expected in Otsuchi Town, Iwate Prefecture tomorrow, the 29th (Wednesday/holiday), is 7 to 8 mm.
It looks like there will be more rain today than yesterday, and tomorrow than today.



Let's take a look at the forecast weather map ahead.
On the night of tomorrow, the 29th (Wednesday/Holiday), the area around Honshu will be covered by an anticyclone, but a low pressure system and front will be approaching from the west.
It is expected to start raining at night in Kyushu and the Nansei Islands, where a low pressure system and front are approaching.

From the 30th (Thursday) to the 1st (Friday), a
low pressure system is expected to develop and pass near Honshu.

Therefore, there is a risk of heavy rain over a wide area from western Japan to northern Japan.
Also, there are likely to be warning-level heavy rains in some places on the Pacific side.
The wind will also be strong, which may affect transportation.
Please pay attention to the latest information when going out.



Let's take a look at the forecast weather map from the 2nd (Saturday) onwards.
Forecasts may still change during the latter half of the holiday, but from
3rd (Sunday) to 4th (Monday), it is expected to bring widespread rain again due to the effects of low pressure and fronts.

However, the forecast may still change depending on the movement of this front, so please check the latest forecast for the weather during the second half of the holidays.



Let's take a look at the 10-day forecast.
From now on, the weather will change periodically.
The rain and wind are likely to increase from the 30th (Thursday) to the 1st (Friday).

Also, it will rain in some places from the 3rd (Sunday) to the 4th (Monday).
On rainy days, the temperature will be low and it will feel cool, but on sunny days, the temperature will rise to around 25c, and it will suddenly become hot.
Please pay close attention to daily temperature changes.