[1-month forecast] Temperatures are higher than normal in eastern and western Japan and Okinawa/Amami, susceptible to the effects of low pressure and fronts.

2026/06/05 23:49

On the 4th (Thursday), the Japan Meteorological Agency announced the forecast for the month from June 6th to July 5th.

Over the next month, temperatures will be high in eastern and western Japan, as well as Okinawa and Amami, as the region will be easily covered by warm air. In northern Japan, temperatures will be low in the first week and high in the second week, with large fluctuations in temperature.

As it is susceptible to the effects of low pressure systems, fronts, and humid air, precipitation will be heavy in Okinawa and Amami, and will be at or above normal on the Pacific side of northern, eastern, and western Japan.
Sunshine hours are expected to be at or below normal on the Pacific side of eastern and western Japan.



Prediction results from the numerical forecast model.
The monthly average sea level pressure (figure on the left) shows that the pressure is higher than normal near the Sea of Okhotsk, and a Sea of Okhotsk anticyclone is expected. On the other hand, the atmospheric pressure will be lower than normal over the Pacific side of eastern and western Japan and Okinawa/Amami, making it susceptible to the effects of fronts and humid air.

The temperature at an altitude of approximately 1,500 meters (right chart) is lower than normal in northern Japan, and there will be periods when it is likely to be covered in cool air. On the other hand, eastern and western Japan and Okinawa/Amami are expected to be higher than normal and likely to be covered by warm air.





Forecast of average temperature, precipitation, and sunshine hours for the next month, and weekly average temperature (probability of occurrence (%)).

Temperatures over the next month are expected to be near normal in northern Japan, but high in eastern and western Japan and Okinawa and Amami.

The Sea of Japan side of eastern and western Japan will have many cloudy and rainy days, similar to normal years, and the Pacific side of eastern and western Japan will have more cloudy and rainy days than normal.
Precipitation will be at or above normal on the Pacific side of northern, eastern, and western Japan, and will be above normal in Okinawa and Amami.
Sunshine hours are expected to be at or below normal on the Pacific side of eastern and western Japan.

In northern Japan, the weather will change every few days during the first half of the period, but there will be more cloudy and rainy days compared to normal years, and the second half of the period will have many cloudy and rainy days, similar to normal years. In northern Japan, the temperature will be low in the first week and high in the second week, and there will be large fluctuations in temperature.
Please be careful of the temperature difference and dress appropriately to keep yourself in shape.

In Okinawa/Amami, the first half of the period will have more cloudy and rainy days than normal years, and the second half of the period will have many sunny days, similar to normal years.

The rainy season has already been announced in western Japan, from Okinawa to Kinki. Okinawa/Amami and the Pacific coasts of eastern and western Japan may experience higher than average rainfall, so please prepare for heavy rain disasters and check the latest weather information.
In addition, temperatures are expected to be higher than normal in eastern and western Japan, Okinawa, and Amami. There are likely to be some days where it will be hot and humid, so please take precautions against heatstroke.

Widespread rain over the weekend; stormy weather possible on the 8th

2026/06/05 22:49

There is a low pressure system in the central Japan Sea that is moving northeast. A front is stationary in the south of Japan, and a low pressure system above the front is moving southeast. There is a tropical cyclone near Taiwan that is moving north. Due to the influence of the front, it is currently raining in the Nansei Islands, and thunder has been observed near Okinawa due to the heavy rain clouds. In other areas of the country, the sky is also cloudy.



Tomorrow, a low-pressure system in the Sea of Japan will approach west of Hokkaido, causing rain in northern Japan, mainly on the Sea of Japan side of the Tohoku region. There will be some sunshine from eastern to western Japan, but the weather will turn downward from the west due to the approach of a low pressure system. Rain is expected to start in the Kyushu region in the evening.



The area of rain will further spread into the 7th (Sunday), and stormy weather is expected nationwide on the 8th (Monday). Check the latest weather forecast.

There is a risk of heavy rain in Kagoshima Prefecture from the 6th to the 7th (Sunday) tomorrow, and in Okinawa on the 7th (Sunday). Be careful of landslides and flooding in low-lying areas.

2026/06/05 19:08

The rainy season front is moving from southern China to the Nansei Islands and extending to the east of Japan. Additionally, a tropical cyclone is moving north-northeast near Taiwan, and rain clouds are developing over the Nansei Islands, where moist air is flowing.
In Amagi, Amagi Town, Kagoshima Prefecture, heavy rain of 42.5 mm was observed in the hour until 16:59.

The rainy season front is expected to move northward to the southern part of Kyushu from tomorrow the 6th (Saturday) to the 7th (Sunday) the day after. The tropical cyclone will move northward in the East China Sea, and the warm, humid air surrounding the tropical cyclone will flow toward the Baiu front, causing extremely unstable atmospheric conditions in the Nansei Islands.

In the Okinawa main island region and the Sakishima Islands, there are expected to be very heavy to heavy rain in some places, and in Kagoshima Prefecture, from the afternoon of the 6th (Saturday) tomorrow to the 7th (Sunday). Depending on the degree of rain cloud development, there is a risk of heavy rain reaching warning level. Please be careful of landslides, flooding of low-lying areas, and rising river waters.
Also, please be careful as there is a risk of lightning strikes and strong gusts of wind such as tornadoes.



#Forecasted amount of rain (in areas where there is a lot)
+1-hour precipitation expected for today, 5th
Miyakojima region 30mm
Yaeyama region 30mm
+1-hour precipitation expected for tomorrow 6th (Sat)
Kagoshima prefecture (Am) (excluding Mi region) 40mm
Amami region 40mm
Miyakojima region 40mm
Yaeyama region 50mm
Okinawa main island region 30mm
+24-hour precipitation expected by the evening of tomorrow 6th (Saturday)
Kagoshima prefecture (excluding Amami region) 50mm
Amami region 80mm
Okinawa main island Region: 60mm
Miyakojima region: 80mm
Yaeyama region: 120mm
+Sunday evening on the 7th Expected 24-hour precipitation
Kagoshima Prefecture (excluding Amami region) 200mm
Amami region 120mm
Okinawa main island region 60mm
Miyakojima region 80mm
Yaeyama region 60mm

[Ocean Summary] Waves are gradually increasing south of Okinawa due to Typhoon No. 6 Sea surface temperatures in the Sea of Japan and East China Sea are higher than normal

2026/06/05 16:53

Due to the effects of Typhoon No. 6, the waves in the south of Okinawa gradually became higher.
Sea surface temperatures in the Sea of Japan and the East China Sea were about 3 C higher than normal.
Below is a summary of the ocean (May 24-30, 2026)



#Pressure distribution and waves
On the 24th and 25th, a front passed from the continent to the Nansei Islands, extending from the south of Japan to the east of Japan, and the low pressure on the front moved eastward from the south of Japan to the east of Japan.
The waves were high in the south of Japan and the east of Japan.
From the 26th to the 27th, the seas near Japan remained calm.
On the 28th, the gradient in atmospheric pressure increased between the low pressure in the northern Sea of Japan and the high pressure far east of Japan, causing waves to become higher east of Japan.
From the 29th to the 30th, a low-pressure system accompanied by a front moved northward over the Sea of Okhotsk, and the front passed from the Sea of Okhotsk to the east of Japan, extending from the south of Japan to the waters near the Nansei Islands.
There were places in the east of Japan and the Sea of Okhotsk where waves rose and became barges.
On the 30th, Typhoon No. 6 was developing in the east of the Philippines and moving northwest, and the waves gradually became higher in the south of Okinawa.



#Sea surface temperature
Sea surface temperatures in the northern part of the Japanese Sea were at normal levels, but in the central and western continental areas, sea areas continued to be significantly higher than normal, reaching up to 3 C higher. In addition, areas in the East China Sea that were much warmer than normal expanded, and were up to 3 C warmer.
The waters around the Nansei Islands were at normal levels, and areas south of Japan where the waters were slightly higher than normal expanded.
The waters off the Tokai coast are at normal levels, while the eastern Kanto region continues to have higher than normal waters.
Off the coast of Sanriku, the area of lower-than-normal waters has shrunk.
The waters off the southeastern coast of Hokkaido remained at normal levels, and the seas near the Chishima Islands and the Sea of Okhotsk continued to operate at normal levels.

[Be careful of trends in tropical cyclones] There is a risk of warning-level heavy rain mainly on the Pacific side of western Japan on the 7th (Sunday) (commentary: weather forecaster Atsuko Miyake)

2026/06/05 13:37

Over the weekend, a low pressure system with cold air is expected to approach from the north, and a tropical cyclone is likely to approach from the south.



This is the forecasted weather map for tonight.

Although the Baiu front has moved away from Honshu, there is a tropical cyclone to the south of the Baiu front.
The tropical cyclone is expected to gradually move northward into tomorrow (Saturday).

Also, the low pressure system near Hokkaido is expected to approach northern Japan tomorrow (Saturday).
The atmosphere is likely to be unstable in northern Japan due to the presence of cold air above the low pressure system.



First, let's take a look at the rain and wind associated with the northern low pressure system.

It is expected to start raining on the Sea of Japan side of northern Japan tomorrow morning.

In particular, strong winds blow from the east in Hokkaido, especially in the Oshima Peninsula and Ishikari region, so
there is a possibility that a storm warning will be issued in the morning.

In the afternoon, the area where the rain falls will become narrower, but the strong easterly winds are likely to continue.

Please be careful of strong winds in Hokkaido tomorrow, and be careful of sudden strong rain, lightning strikes, and gusts of wind.



Next, we will look at the future movements of the Baiu front over the southern seas and the tropical cyclone.
This tropical cyclone has very warm and humid air of tropical origin.

As moist air flows towards the seasonal rain front, it is likely to increase front activity.

The tropical cyclone (or extratropical cyclone) and the rainy season front are expected to become one until the 7th (Sunday).
Furthermore, a low pressure system will develop and move along the southern coast of Honshu until the 8th (Monday).

In the Pacific side of western and eastern Japan, which are close to low pressure systems and fronts, there is a possibility of warning-level heavy rain from
7th (Sunday) to 8th (Monday).



Let's take a look at the possibility of heavy rain warnings being announced (early warning information).
On the afternoon of the 7th (Sunday), there is a possibility that heavy rain warnings will be issued widely
mainly in the Pacific side of Kyushu, Shikoku, and the Kinki region.

In addition, heavy rain warnings may continue to be issued in Tokushima and Mie prefectures into the 8th (Monday).
The heavy rain from the recent typhoon has already loosened the ground.

Even a small amount of rain increases the risk of landslides, so please be careful and alert to the direction of the rain.

Please carefully observe your surroundings,
If you feel that things are different from usual, please move to a safe place as soon as possible.



From the weekend to the beginning of the week, there is a possibility that the rainy season will be announced in the Tokai region and Kanto-Koshin region, where the rainy season has not yet begun.



, we will look at the detailed weather of each place. The weather is Saturday and Sunday.

Tomorrow (Sat), there will be many sunny days around Honshu.
The temperature and humidity are high, making it feel quite hot and humid.
In southern Kyushu, it looks like rain may start as early as tomorrow night.

On the 7th (Sunday), rain is expected to begin in the morning in western Japan, and gradually in the afternoon in eastern Japan.
Even with the rain, the temperature is high and it seems to be quite hot and humid.



Weekly forecast.
In northern Japan, a low pressure system that changes from a tropical cyclone is developing and approaching towards the end of the week.
Northern Japan needs to be careful about the rain and wind that will become stronger at the beginning of the week.

And in the Okinawa region, the rainy season front will remain stationary for a while,
there is a risk that heavy rain will continue.

There is a risk of warning-level heavy rain again in the Okinawa region, especially from Tuesday the 9th to Wednesday the 10th.

The rainy season has entered its second half in the Okinawa region.
Please be careful and be on guard against repeated heavy rains towards the end of the rainy season.

What day is tomorrow That fruit that ripens at this time of year...

2026/06/05 11:04

Do you know what day tomorrow June 6th is There are various anniversaries such as ``Musical Instruments Day'' and ``Drinking Water Day,'' but it is also ``Plum Day.'' Today I would like to talk about plums.

Why is the long rain in June called "tsuyu" in the first place The word "rainy season" originally came from China. In the lower reaches of the Yangtze River in China, there is a period of long rain in early summer when the plum fruits ripen yellow, and is called the ``yellow rainy season.'' It is believed that after that, the character ``yellow'' was omitted and the word ``rainy season'' came to be written. In Japan, ``rainy season'' has been pronounced as ``tsuyu'' since the Edo period. The pronunciation of ``tsuyu'' is said to come from the word ``dew,'' which means dampness, and the word has become established as a soft way to express humid air.

Plums have the property that their flower buds will not bloom properly unless they experience a certain period of low temperature. It also prefers a sunny location and well-drained soil, and does not like humidification. Plum is a rare flower that blooms in early spring when it is still cold. The lack of other flowers makes it easier to secure sunlight, which results in stable fruit production.

During this time of year, there are large changes in atmospheric pressure and the weather is not refreshing, so many people may be feeling unwell. Plums are rich in potassium, iron, vitamin C, vitamin E, dietary fiber, and citric acid, and have effects such as recovering from fatigue and restoring immunity. If you are not feeling well, please try eating plums. Let's survive the coming season!

Tropical cyclone to the west of the Philippines; pay attention to future trends

2026/06/04 19:16

As of 3:00 p.m. today, Thursday, April 4, there is a ``tropical cyclone'' that is a ``typhoon egg'' near the western coast of the Philippines, and it is moving northeast. The central pressure is 1002 hectopascals, and it is thought to be moving northeast at a speed of 20 kilometers per hour.
This tropical cyclone is expected to continue moving northeast and near Taiwan on the 6th (Saturday).



On the 7th (Sunday), this tropical cyclone will become an extratropical cyclone and will approach western Japan. The rainy season front will also move northward, extending the area of rain to western Japan.
There may be strong or heavy rain in some places, especially on the Pacific side of western Japan.



The low pressure system is expected to move east along the southern coast of Honshu by the end of the week, on the 8th (Monday).
Rain will fall from western Japan to eastern Japan, and there is a possibility that the amount of rainfall will be concentrated mainly on the Pacific side. Please pay close attention to future information.

[Beware of heavy rain early in the rainy season] Fear of warning-level heavy rain again on Kyushu 7th (Sunday) (Commentary: Weather forecaster Atsuko Miyake)

2026/06/04 14:45

Today, June 4th (Thursday), it was announced that the rainy season seems to have begun in northern Kyushu.
In northern Kyushu, the rainy season started 19 days later than last year, which is the same as in normal years.



The announcement of the start of the rainy season is also a notice that "the heavy rain season is almost here."
Let's once again check the evacuation route and check the disaster prevention goods.



Live weather map.
Yesterday night, Typhoon No. 6 became an extratropical cyclone over the sea east of Kanto.
A new low pressure system has formed on the front where this low pressure system extends.
This low pressure system and front are approaching the Kyushu region.



Let's take a look at the rain clouds.
Live commentary at 11am.
There are active rain clouds in the Kyushu region, mainly in the south.
More than 10mm of heavy rain has been observed in Miyazaki and Kagoshima prefectures in the past hour.



Let's take a look at the rain clouds after this.
I'll watch it from 3pm.
In southern Kyushu, there are orange and red signs.
There is a risk of very heavy rain in some places, accompanied by thunder.
Very heavy rain is rain that can't keep up with drainage in urban areas.
It is expected to rain so quickly that the roads will turn into rivers.



Furthermore, there are red signs even in Kumamoto Prefecture towards night.
There is a risk of heavy rain accompanied by thunder.
Be careful of heavy rain with thunder, lightning strikes, and gusts of wind late at night.
The active rain clouds are expected to leave Kyushu by the time the date changes.
And there will still be some rain left in the morning, but it looks like the rain will stop in most places in the morning.
The weather looks like it will improve during the day tomorrow.



, we will take a look at the detailed weather of each place.
There will be some rain tomorrow until morning.
During the day, the sun will return and the temperature will rise to around 30 degrees in some places.
The heat will return at once tomorrow, so
Please take sufficient precautions against heat stroke before heading out.



Weekly forecast.
Saturday the 6th will be sunny in many places.
It will be Sunday the 7th. The next low pressure system or front is approaching.
There is a risk of heavy rain in the Kyushu region again.
It looks like there will still be some rain on the 8th.
There will be some sunny spells after the 9th, but Miyazaki and Kagoshima are likely to experience rainy weather due to the influence of the rainy season front.

[Rainy season begins in Northern Kyushu, Chugoku, and Kinki] Early on the 7th (Sunday), warning level heavy rain begins. Prepare for the next rain (Commentary: Weather forecaster Atsuko Miyake)

2026/06/04 13:49

Today, June 4th (Thursday), it was announced that the rainy season appears to have begun in northern Kyushu, the Chugoku region, and the Kinki region.



Northern Kyushu is on par with normal years,
The Chugoku region and Kinki region entered the rainy season two days earlier than normal. (Preliminary figures)

This announcement of the start of the rainy season also means that
``It's the beginning of the full-fledged heavy rain season.''
Let's take another look at disaster prevention goods and confirm evacuation routes.



Let's take a look at the live weather map.
Typhoon No. 6 turned into an extratropical cyclone over the sea east of Kanto yesterday night.

The low pressure system that evolved from this typhoon is still east of Kanto, and strong winds continue on the Pacific side of eastern Japan and
on the Pacific side of Tohoku.

Please be careful of strong winds into today's evening.

And another low pressure system is forming on the front where this low pressure system extends.
This low pressure system and front are approaching from the west of Kyushu.



Let's take a look at the rain cloud situation.
Live commentary at 11am.
Rain clouds are covering Kyushu, the Chugoku region, and the Shikoku region.

There are particularly active rain clouds over the southern part of Kyushu, with heavy rain exceeding 10mm per hour observed.



Now, let's take a look at the rain clouds.

We'll be watching from 3pm.
There are orange and red markings, especially in southern Kyushu.

There is a risk of very heavy rain with thunder.
There is a risk of rain falling like waterfalls, so please be careful about how it rains.



From evening to night, rain clouds will begin to cover the Shikoku and Kinki regions.

There is a risk that there will be even more heavy rain in areas where there was heavy rain due to the recent typhoon.

Please be aware that even a little rain increases the risk of landslides.

The active rain clouds are expected to gradually move out over the sea by tomorrow morning.
We don't expect these active rain clouds to cover eastern Japan.



Let's take a look at the forecast weather map for the next week.

A tropical cyclone will move into the East China Sea on Saturday.
We predict that there will be a seasonal rain front further north.

From now until Sunday the 7th,
the tropical cyclone is expected to merge with the seasonal rain front and approach western Japan, including Kyushu.
Very warm and humid air is expected to flow in from the south towards this low pressure system and front,
again bringing warning-level heavy rain to western Japan.
Please be careful as there will be heavy rain early in the rainy season.



, we will look at the detailed weather of each place.

Tomorrow, it will rain in many places in western Japan until morning.
During the day, the sun will return and temperatures in western Japan are likely to rise to nearly 30 degrees.


On the other hand, on the Pacific side of eastern Japan and Tohoku, there are many clouds due to the influence of humid air.
It's not expected to be that hot here.



Weekly forecast.

Another low pressure system will approach northern Japan on the 6th (Saturday), and it is likely to rain in many places on the Sea of Japan side of northern Japan.
On the 7th (Sunday), there is a risk of warning-level heavy rain mainly in western Japan.


In addition, from the 8th (Monday) to the 9th (Tuesday), there is a risk that both rain and wind will become stronger in eastern and northern Japan.
Please continue to pay attention to the latest information.

Estimated rain intensity and direction for the coming season

2026/06/04 13:23

The rainy season has gradually entered Western Japan, and Typhoon No. 6 brought heavy rain mainly to areas on the Pacific side.
From now on, it will be rainy season. When I look at the weather forecast, I hear expressions such as ##mm of rain per hour, but it's hard to imagine how heavy the rain will be. I have summarized the strength of the rain and how it falls. Please refer to it if you like.

+1mm of rain per hour
This means that water accumulates on the ground to a depth of 1mm in 1 hour.
Many people probably don't use umbrellas because of the foggy rain.

+Over 2mm of rain per hour
Most people carry umbrellas.

+Over 5mm of rain per hour
Puddles form.

+Over 10mm of rain per hour
Your feet will get wet from the rain bouncing off the ground.
It's hard to hear voices outdoors due to the sound of rain.

+Over 20mm of rain in one hour
Even with an umbrella, you will get wet.
Some people may wake up to the sound of rain while sleeping.

+Over 50mm of rain per hour
Umbrellas become completely useless.
Water spray makes the area look gray and visibility becomes poor.
Driving a car is dangerous.

+More than 80mm of rain per hour
There is a feeling of pressure that makes it hard to breathe, and I feel scared.
There is a high risk of disasters occurring due to rain, so strict vigilance is required.

Due to Typhoon No. 6, more than 50mm of rain fell in one hour in some places, and there is a fear that there will be heavy rain locally due to the typhoon and the rainy season. Be prepared for disasters by checking not only whether it will rain, but also how much it will rain.