The autumn rain front is moving slowly southward near Honshu. There is a risk that heavy rain will continue for a long time due to Typhoon No. 24 and the autumn rain front.

2026/09/03 17:48

Today, the 3rd (Thursday), an autumn rain front extends near Honshu and is slowly moving south. A band of active rain clouds accompanying the front is passing from western Japan to eastern Japan.



The autumn rain front is expected to move southward over eastern and western Japan, and is expected to stay near the southern coast of Honshu from tomorrow 4th (Friday) to 5th (Saturday).



From tomorrow, the 4th (Friday), rainfall will increase from western Japan to eastern Japan, and there is a risk of extremely heavy rain accompanied by thunder, especially on the Pacific side of western Japan. Please be extremely cautious of landslides, flooding of low-lying areas, rising water levels and flooding of rivers, etc.



In addition, Typhoon No. 24 will approach Okinawa and Amami towards tomorrow, the 4th (Friday), and its movement will slow down after that. It makes complicated movements like spinning around at sea, and there is a risk of getting lost.

Typhoons and autumn rain fronts are typical heavy rain patterns. As Typhoon No. 24 slows down near Okinawa, the flow of warm, humid air is expected to continue for a long period of time, increasing the activity of the autumn rain front. Warning-level heavy rain is likely to continue across a wide area from Kyushu to Tohoku, and there is also a risk of intermittent heavy rain in the Kanto region.

Please continue to check weather information regularly.

Sea surface temperatures near Japan continue to be higher than normal in the northern part [Ocean summary (August 23 to August 29, 2026)]

2026/09/03 15:51

Sea surface temperatures in the seas around Japan continued to be higher than normal in the northern part of the country, and were significantly higher than normal in the northern and central Japan Sea, off the southeastern coast of Hokkaido, near the Kuril Islands, and in the Sea of Okhotsk, continuing from last week. In the waters around the Kuril Islands, the maximum temperature was 5 C above normal.

Due to Typhoon No. 18, wave heights of 4 to 6 meters occurred near the Nansei Islands from the 25th to the 27th.

Below is a summary of the ocean (August 23, 2026 - August 29, 2026)



During the period, Typhoon No. 18 moved westward from the waters near Ogasawara to the south of Japan, passed through the Nansei Islands, and headed toward Central China. Waves rose around the typhoon, reaching heights of 4 to 6 meters near the Nansei Islands from the 25th to the 27th. From the 25th to the 26th, waves continued to be high on the Pacific side, with wave heights of around 3 meters. From the 24th to the 25th, a low pressure system accompanied by a front moved northeast from Primorye to Sakhalin, causing waves to rise to a height of 3 meters in the southern Sea of Okhotsk on the 25th. From the 27th to the 28th, low pressure systems with cold air in the sky passed near Hokkaido one after another, causing waves to rise to a height of 3 meters west of Hokkaido on the 28th. During the period, the Japanese sea area, where the front was stationary, remained generally calm.



In the Japanese sea area, the sea area is significantly higher than normal. Temperatures in the central Japan Sea were up to 4 C higher than normal. Sea conditions in the East China Sea and the Nansei Islands continued to be slightly lower than normal as in the previous week. Temperatures off the coast of Shikoku and the Tokai region were at normal levels at the beginning of the period, but were slightly higher than normal towards the end of the period. The waters east of Kanto were slightly higher than normal, and the waters off Sanriku continued to be higher than normal. Sea areas off the southeastern coast of Hokkaido, around the Kuril Islands, and in the Sea of Okhotsk continue to be above normal, as they were last week. In the waters around the Kuril Islands, temperatures were up to 5 C higher than normal.

[Typhoon No. 24] Going around Okinawa - Possibility of long-term impact

2026/09/03 07:45

Typhoon No. 24 was located south of Minami Daito Island at 3:00 on the 3rd, and was moving north-northwest at a speed of approximately 20 kilometers per hour.
The atmospheric pressure at the center is 992 hectopascals, the maximum wind speed near the center is 18 m, the maximum instantaneous wind speed is 25 m, and strong winds of 15 m or more are blowing within a radius of 280 km from the center.

Also, a low pressure system accompanied by a front is moving east near the Oshima Peninsula in Hokkaido, and the front is extending to the Sea of Japan coast of the Tohoku region, off the coast of the Hokuriku region, and off the coast of the San'in region.



In the Tohoku and Hokuriku regions, there are places where localized heavy rain or extremely heavy rain is causing heavy rain.

Typhoon No. 24 will approach the Nansei Islands over the next 4 days, move north-northwest, and then move slowly.
The forecast is that it will circle counterclockwise around the main island of Okinawa until the 8th.



Meanwhile, the front is expected to move south from northern Japan to eastern and western Japan on the night of the 3rd, and will mostly remain near the southern coast of Honshu from the 4th to the 5th.

Warm, humid air moving north on the east side of the slow-moving typhoon will flow toward the front, and the atmospheric conditions will remain extremely unstable.
There is a risk that heavy to extremely heavy rain will continue to fall over a wide area, mainly from the Pacific side of western Japan to eastern Japan, into the 5th.



Depending on the path of the typhoon and the movement of the front, there is a possibility that heavy rain will continue even after the above period and the total rainfall will increase further. Please be careful of flooding in low-lying areas, rising and overflowing rivers, and landslides.

Also, due to the effects of the typhoon, you should be careful of strong winds and waves in the Okinawa and Amami regions.
[Wind forecast]

Maximum wind speed (maximum instantaneous wind speed) expected from the 3rd to the 5th
Amami region 18 meters (25 meters)
Okinawa region 17 meters (25 meters)

[Wave forecast]
Southern Kyushu 4 meters with swells
Amami region 5 meters with swells
Okinawa region 5 meters with swells

Please check the latest weather information and typhoon path forecast
.

Active rain clouds in Aomori Prefecture; level 4 landslide danger warning in the prefecture

2026/09/02 23:02

A low pressure system is located over the sea west of Hokkaido and is moving east-northeast. A front extends from this low pressure system toward the Tohoku region, and warm, humid air is flowing toward the low pressure system and front, making the atmospheric conditions in the Tohoku region extremely unstable.
Currently, there are active rain clouds around Aomori Prefecture, and there are places where it is raining heavily with thunder.



In Aomori Prefecture, a linear rain belt formed in the early hours of the 2nd today.
In Aomori Prefecture, the rainfall in the 24 hours up to 21:40 reached 231.0 mm, breaking the record for the highest amount in recorded history.

There is a high possibility that the ground has become loose due to previous rains, and a level 4 landslide warning has been issued for parts of Aomori Prefecture.
If you are near a dangerous slope or cliff, evacuate immediately.



The front will move southward over the Tohoku region through the night of the 3rd, and the cold air in the upper atmosphere will become stronger through the 4th, so the atmosphere is expected to remain extremely unstable.
Please be careful about landslides, and also be wary of flooding of low-lying land due to heavy rain, and rising water levels and flooding of rivers.

Please continue to pay attention to the latest weather information.

Atmosphere unstable due to front and typhoon; stormy weather over wide area over the weekend

2026/09/02 21:39

The atmospheric conditions near Japan are extremely unstable due to the effects of fronts and typhoons.
From around the 3rd (Thursday) to the 5th (Saturday), there is a risk of heavy rain and increased rainfall mainly from the Pacific side of western to eastern Japan.

A low pressure system is moving northeast near western Hokkaido, and a front extending from this low pressure system is reaching from southern Hokkaido, the Tohoku region, and the central Japan Sea to the vicinity of the Tsushima Strait.
An anticyclone is located far to the east of Japan, and its marginal flow extends to the south of Japan.



Typhoon No. 24 is near the Amami Islands and is slowly moving north.
In addition, Typhoon No. 18 has developed into a typhoon again in the South China Sea and is moving slowly east-northeast.

Southerly moist air currents blowing in from the east side of these typhoons and southerly winds from the distant high-pressure edge flow into the front area, resulting in a pressure distribution that continuously supplies warm, humid air near the front.

Tomorrow, the 3rd (Thursday), there will be a trough of atmospheric pressure near Japan, and convective clouds are expected to develop on the front from Hokkaido to Honshu.
There is a risk of heavy rain accompanied by thunder near the front, and there is a possibility of locally very heavy rain.



Because Typhoon No. 24 moves slowly, the inflow of humid air continues for a long period of time, making it difficult to resolve the unstable atmosphere.

The front is expected to stay near the southern coast of Honshu around the 5th, raising concerns about prolonged rain.
Please pay attention to the latest information regarding the movement of fronts and typhoons.



From around the 3rd to the 5th, there is a risk that heavy or extremely heavy rain will continue to fall over a wide area, mainly on the Pacific side of western to eastern Japan, and the total amount of rainfall will increase.
In areas where the ground has become loose due to heavy rain, even a small amount of rainfall can increase the risk of landslides. Depending on the path of the typhoon and the movement of the front, heavy rain may continue until around the 7th, and the total rainfall may even increase.



There is a risk of sudden rise in river water, flooding of low-lying areas, and a sudden increase in the risk of landslides. Avoid approaching dangerous areas, and if you live in a landslide warning area, please consider evacuating early.
Please pay close attention to the latest weather information and evacuation information from local governments.

[Typhoon information] Typhoon No. 24 (Krovan) is moving slowly, the autumn rain front is stationary near Honshu, and there is a risk of heavy rain over a wide area

2026/09/02 19:40

As of 6:00 pm on Wednesday the 2nd, Typhoon No. 24 (Krovan) is located approximately 280 km south of Minami Daito Island and is moving slowly north.

Typhoon No. 24 will continue to move northward, and is expected to move south of Amami City on the 3rd (Thursday) and north-northwest of Amami City on the 4th (Friday). After that, its movement will slow down, and it will most likely remain stationary from south of Kyushu to south of Japan.



#Typhoon No. 24 2nd (Wed) 6:00 pm
==================/brCenter location South Approximately 280 km
south of Daito Island Travel direction, speed North Slow
Central pressure 994 hPa
Maximum wind speed 18 m/s (near the center)
Maximum instantaneous wind speed 25m/s
==================

In the Nansei Islands, please be careful of landslides, flooding of low-lying areas, and rising water in rivers from around the 5th (Saturday), and be careful of strong winds and high waves accompanied by swells.



Also, there is a low pressure system with a front near northern Japan, which is moving east-northeast. After this, the front is expected to slowly move southward near Honshu on the 3rd (Thursday), and then come to a standstill near the southern coast of Honshu by the 4th (Friday).

The front will remain stationary, and warm, humid air moving north on the east side of the slow-moving typhoon will continue to flow toward the south of the front.
For this reason, from tomorrow 3rd (Thursday) to 5th (Saturday), heavy to extremely heavy rain will continue to fall over a wide area, mainly on the Pacific side of eastern and western Japan, and there is a risk that the total amount of precipitation will increase.
Depending on the path of the typhoon and the movement of the front, heavy rain may continue until around the 7th (Monday).

In eastern and western Japan, please be careful of landslides, flooding of low-lying areas, and rising river waters from the 3rd (Thursday) to the 7th (Monday).

Also, be careful of strong wind gusts such as lightning strikes and tornadoes. If there are signs that a cumulonimbus cloud is approaching, please take precautions such as moving inside a building. There is also a risk of hail, so please be careful when managing crops and agricultural facilities.

Please pay attention to future disaster prevention weather information and evacuation information from local governments. Also, please check the level of risk in your area using Kikikuru from the Japan Meteorological Agency website.

Weather for tomorrow 3rd (Thursday) Front heading south, typhoon approaching

2026/09/02 18:02

The autumn rain front is expected to move slowly southward, and Typhoon No. 24 is expected to move northward over the Nansei Islands. Moist air flowing along the edge of the high-pressure system overhanging the eastern ocean and the moist air around the typhoon will flow into the autumn rain front, causing rain to fall over a wide area from Hokkaido to Okinawa. The severe summer heat in eastern and western Japan is expected to ease a little.



Typhoon No. 24 is expected to approach Okinawa and Amami. In the Nansei Islands, you need to be careful about rain, strong winds, and high waves. It will be uncomfortably hot and humid throughout the day.
Rain is expected over a wide area from Hokkaido to Kyushu. Please take an umbrella with you when you go out. There is a risk of heavy rain accompanied by thunder mainly from the Pacific side of western Japan and Hokuriku to the Sea of Japan side of northeastern Japan.
The harsh summer heat in eastern and western Japan is expected to subside due to the rain. The maximum temperature is expected to be around 30c from Kanto to Kyushu. However, due to the high humidity, it will likely be hot and humid. The expected maximum temperature in northern Japan is around 25c, which will feel relatively cool even during the day.

Weekly weather Typhoon No. 24 + Autumn rain front may cause prolonged effects of heavy rain over a wide area of Honshu

2026/09/02 07:52

As of 6 a.m. today, Wednesday, the 2nd, Typhoon No. 24 is mostly stationary in the south of Japan.

#Typhoon No. 24 Wednesday, 2nd, 6:00 a.m.
==================
Center location: South of Japan
Moving speed: Almost stagnant
Central pressure 996hPa
Maximum wind speed 18m/s (near the center)
Maximum instantaneous wind speed 25m/s
=================



Typhoon No. 24 is expected to move slowly northward and approach Okinawa from tomorrow 3rd (Thursday) to the 4th (Friday). After that, Typhoon No. 24 slows down and is expected to stall near the Amami region before moving southeast. However, there is great uncertainty in predicting the future course, and there is a wide range of possibilities.

In Okinawa and Amami, where Typhoon No. 24 is approaching, the winds will gradually become stronger and the waves will become higher with swells on the sea. Please be careful of strong winds and high waves, and be careful of flooding of low-lying land and landslides due to heavy rain, as well as rising water levels and flooding of rivers.

There is a risk of warning-level heavy rain near Honshu, even in areas far from Typhoon No. 24.



The autumn rain front is likely to remain stationary in the vicinity of Honshu, and as Typhoon No. 24 moves slowly, it is expected that warm, moist air from the typhoon will continue to be sent to the front, extending the period of rain. In addition, due to the influence of cold air in the upper atmosphere, atmospheric conditions will become unstable and there is a risk of warning-level heavy rain over a wide area. The effects of heavy rain will be prolonged and total rainfall will be high.

Pay attention to the latest weather information and typhoon information that will be updated in the future, and be careful of landslides caused by heavy rain, flooding of low-lying areas, and rising and flooding rivers. In case of an emergency, please take all possible precautions against heavy rain, such as reconfirming your evacuation route, securing emergency supplies, emergency water and food, etc.

There is a risk of heavy rain in northern Japan from tonight until the 3rd day after tomorrow due to the influence of a low pressure system.

2026/09/01 19:15

Today, the 1st (Tuesday), a low pressure system with a front in the central Japan Sea is moving east-northeast. This low pressure system is expected to move toward Hokkaido into tomorrow, the 2nd (Wednesday).

In Hokkaido, which is close to a low-pressure area, there will be places where heavy rain will be accompanied by thunder. Depending on the degree of rain cloud development, there is a risk of heavy rain reaching warning level, so please be careful.

Also, due to the influence of warm, humid air flowing toward fronts and low pressure systems and cold air in the upper atmosphere, there will be places in the Tohoku and Hokuriku regions where heavy rain will be accompanied by thunder.
In the Hokuriku region, the ground is loose in some places due to the rain that has fallen so far. Even low rainfall increases the risk of landslides, so please avoid approaching dangerous areas such as cliffs.





In the Hokkaido region, a low-pressure system accompanied by a front is expected to move into the area into next Wednesday, the 2nd. In the southern part of Hokkaido on the Sea of Japan side and the western part of the Pacific Ocean side, heavy rain accompanied by thunder will fall in some places from late Tuesday night on the 1st today until noon on Wednesday the 2nd tomorrow.

Please be careful of flooding of low-lying land, rising river water, and landslides due to heavy rain from early morning until evening on the 2nd tomorrow (Wednesday). Depending on the degree of rain cloud development, there is a risk of heavy rain reaching warning level.

In addition, there is a risk of tornadoes, strong wind gusts, lightning strikes, and hail from late today (Tuesday) to late tomorrow (Wednesday) 2nd.
Please be careful about outdoor activities and crop management. If there are signs that a cumulonimbus cloud is approaching, please take precautions such as moving to a sturdy building.



In the Tohoku region, please be careful of landslides, flooding of low-lying areas, and rising river waters due to heavy rain from early morning on the 2nd (Wednesday) tomorrow until Thursday the 3rd (Thursday).
Also, please be aware of damage to crops and agricultural facilities from tornadoes and other violent gusts, lightning, and hail from early morning until early evening on the 2nd (Wednesday) tomorrow.

In the Hokuriku region, the front is expected to move south from the 3rd (Thursday) to the 4th (Friday), so there is a possibility that the effects will be prolonged and there will be widespread warning-level heavy rain. From the 3rd (Thursday) to the 4th (Friday) the next day, please be careful of landslides, flooding of low-lying areas, and rising river waters.
Also, from the morning of tomorrow 2nd (Wednesday), please be careful of damage to crops and agricultural facilities due to violent gusts such as tornadoes, lightning strikes, and hail.

There is a risk of heavy rain in northern Japan from tonight until the 3rd day after tomorrow due to the influence of a low pressure system.

2026/09/01 19:15

Today, the 1st (Tuesday), a low pressure system with a front in the central Japan Sea is moving east-northeast. This low pressure system is expected to move toward Hokkaido into tomorrow, the 2nd (Wednesday).

In Hokkaido, which is close to a low-pressure area, there will be places where heavy rain will be accompanied by thunder. Depending on the degree of rain cloud development, there is a risk of heavy rain reaching warning level, so please be careful.

Also, due to the influence of warm, humid air flowing toward fronts and low pressure systems and cold air in the upper atmosphere, there will be places in the Tohoku and Hokuriku regions where heavy rain will be accompanied by thunder.
In the Hokuriku region, the ground is loose in some places due to the rain that has fallen so far. Even low rainfall increases the risk of landslides, so please avoid approaching dangerous areas such as cliffs.





In the Hokkaido region, a low-pressure system accompanied by a front is expected to move into the area into next Wednesday, the 2nd. In the southern part of Hokkaido on the Sea of Japan side and the western part of the Pacific Ocean side, heavy rain accompanied by thunder will fall in some places from late Tuesday night on the 1st today until noon on Wednesday the 2nd tomorrow.

Please be careful of flooding of low-lying land, rising river water, and landslides due to heavy rain from early morning until evening on the 2nd tomorrow (Wednesday). Depending on the degree of rain cloud development, there is a risk of heavy rain reaching warning level.

In addition, there is a risk of tornadoes, strong wind gusts, lightning strikes, and hail from late today (Tuesday) to late tomorrow (Wednesday) 2nd.
Please be careful about outdoor activities and crop management. If there are signs that a cumulonimbus cloud is approaching, please take precautions such as moving to a sturdy building.



In the Tohoku region, please be careful of landslides, flooding of low-lying areas, and rising river waters due to heavy rain from early morning on the 2nd (Wednesday) tomorrow until Thursday the 3rd (Thursday).
Also, please be aware of damage to crops and agricultural facilities from tornadoes and other violent gusts, lightning, and hail from early morning until early evening on the 2nd (Wednesday) tomorrow.

In the Hokuriku region, the front is expected to move south from the 3rd (Thursday) to the 4th (Friday), so there is a possibility that the effects will be prolonged and there will be widespread warning-level heavy rain. From the 3rd (Thursday) to the 4th (Friday) the next day, please be careful of landslides, flooding of low-lying areas, and rising river waters.
Also, from the morning of tomorrow 2nd (Wednesday), please be careful of damage to crops and agricultural facilities due to violent gusts such as tornadoes, lightning strikes, and hail.