[Kanto / Autumn Rain Front Intensifying] Rainy Weekend Ahead; Possible Typhoon Impacts (Analysis by Meteorologist Junko Miyake)

2026/09/25 14:50

Kanto is expected to see the autumn rain front become active again this weekend.



Let's take a look at the forecast weather charts for tonight and tomorrow night.
During the day today (Friday), a high-pressure system will bring sunny intervals to many areas, but moist air will begin to flow in during the evening, and many parts of the Kanto region are likely to see rain starting.

On Saturday, a front will extend from the continent and is expected to stall near the Kanto region.

[Kanto / Autumn Rain Front Intensifying] Rainy Weekend Ahead; Typhoon Influence Also a Concern
(Analysis by Meteorologist Atsuko Miyake)
Moist air will flow toward this front, causing it to become more active.



Here is the outlook for rain clouds later tonight.
Late tonight, rain is expected to begin in parts of the Kanto region.

After midnight and into the early morning hours on Saturday,
yellow, green, and orange shading will appear over Kanto, indicating areas where rain clouds will develop and rainfall will intensify.



Through early afternoon on Saturday, active rain clouds will continue to form, especially along the coastal areas of Chiba and Ibaraki.

From Saturday evening onward, rain clouds will gradually move away, and late at night many areas will see a temporary break in the rain.

However, on Sunday the 27th, rain clouds associated with the front will move northward again.
Kanto is expected to see widespread rain on Sunday morning.

Recently, Typhoon No. 25 brought heavy rainfall to the Kanto region, particularly in Chiba and Kanagawa, where rainfall amounts exceeded the seasonal average.



This graphic shows accumulated rainfall over the past 10 days.
Compared with the average, many areas in Kanto are shaded in dark green.
In Kanagawa and Chiba, rainfall over just the past 10 days has been five to seven times the normal amount.
The ground is already very unstable, so even light rain this weekend could trigger landslides. Please exercise caution.



Another factor requiring attention is the typhoon.
It is expected to intensify and move northward.
Around Okinawa, the typhoon will likely slow down significantly.
Although the future track remains uncertain, there is a possibility that it may affect the Kanto region in the latter half of next week.
Please continue to monitor the latest updates.



Now, let's look at the weather across the regions.
This weekend-Saturday and Sunday-many areas will experience rain.
Temperatures will also drop, and Saturday is expected to feel quite chilly.
Please take care to avoid health issues caused by sudden temperature changes.



Here is the weekly forecast.
The autumn rain front will remain stalled into next week, bringing many rainy days to the Kanto region.
In the latter half of next week, rain clouds associated with the typhoon may approach as well.
Please stay updated with the latest typhoon information.

[Front+Typhoon] Autumn Rain Front to Bring a Wet Weekend to Honshu; Okinawa and Amami Face Prolonged Severe Weather from Typhoon No. 26 (Analysis by Meteorologist Junko Miyake)

2026/09/25 14:36

This weekend, the autumn rain front is expected to become more active around Honshu.



First, here are the forecast weather charts for tonight and tomorrow night.
During the day today (Friday), Honshu will be covered by a high-pressure system from the north, bringing sunny intervals to many areas.

By tonight, a front will extend from the west, and tomorrow (Saturday) it is expected to stall from western Japan to the Pacific side of eastern Japan.

Moist air circulating along the edge of the high-pressure system, as well as warm, humid air around the typhoon, will flow toward the front. As a result, the autumn rain front will become more active, and some areas may see heavier rainfall.



Here is the rainfall forecast.
Around midnight on Saturday the 26th, rain clouds will begin to cover parts of western and eastern Japan.

In the Kanto region, rainfall may intensify from the early hours through dawn.
From morning to midday, rainfall will also strengthen in western Japan.
Kanto will continue to see areas of heavier rain, especially along the coast.



From early afternoon to evening, the rain clouds are expected to gradually move southward, and many areas will see a temporary break in the rain at night.

However, on Sunday the 27th in the morning, rain clouds associated with the front will move northward again.

During the daytime this weekend, many areas will need umbrellas.

In southern Kanto, where Typhoon No. 25 brought heavy rain recently, the ground remains very unstable. Even light rainfall could trigger landslides, so please exercise extreme caution.



Another factor requiring attention is Typhoon No. 26.

Typhoon No. 26 is currently located over the sea east of the Philippines and moving westward.
It is expected to intensify and develop a storm zone by Saturday.
After that, it may approach Okinawa and the Amami region with strong intensity.

The typhoon is currently moving at 20 km/h, but as it nears Okinawa, its speed is expected to slow to around 10 km/h and then become even slower.

This means Okinawa and the Amami region may experience a situation where the typhoon remains nearby for at least two to three days, leading to prolonged severe weather conditions.

From the 27th to the 30th in Okinawa, and from around the 28th to the 30th in the Amami region, please be alert for strong winds, high waves, and storm surges.

Depending on the typhoon's track, heavy rainfall may also become a concern in Okinawa and the Amami region.
Please continue to monitor the latest updates.



Now, here is the weather for today through the weekend.

Clouds will increase tonight, and some areas in the Kanto region may see rain.

On Saturday and Sunday, many areas from Okinawa to southern Tohoku will experience rain.
Temperatures on Saturday will be notably cool, with Osaka and Nagoya around 23C, and Tokyo and Sendai around 21C.
Be sure to prepare rain gear and bring a jacket when heading out.

Rain will continue through Sunday, and some areas will remain on the cooler side.



Here is the weekly forecast.
From Sunday the 27th through Wednesday the 30th, Typhoon No. 26 will approach Okinawa.
Please stay alert for strong winds, high waves, storm surges, and heavy rain over an extended period.

Around Honshu, the autumn rain front will remain in a stagnant pattern.
As the typhoon moves northward, the front near Honshu is also expected to become more active.
Later next week, there is a possibility that the typhoon may approach Honshu as well.
Please continue to check the latest typhoon information.

[Weekly Weather Forecast for the Kanto Region] Rain likely throughout the coming week; stay alert for Typhoon No. 26 and the autumn rain front. What precautions should be taken regarding the prolonged rainfall?

2026/09/25 14:29

The Kanto region has seen many rainy or cloudy days since the start of September, including significant heavy rainfall caused by Typhoon No. 25. Over the coming week, the region is expected to experience unsettled weather with frequent rain, driven by the autumn rain front and Typhoon No. 26.



Today, the 25th (Friday), the Kanto region is under the gentle influence of a high-pressure system, and many areas are currently seeing sunshine.
However, moist air will gradually flow in later today, leading to increasing cloud cover. Rain is expected to begin falling as the evening progresses, so those returning home late will likely need rain gear.

Tomorrow, the 26th (Saturday), a front is forecast to extend from western Japan toward the vicinity of the Izu Islands. The Kanto region is likely to experience rainy weather, so rain gear will be necessary for any outings. Please stay alert to the rainfall, as the rain may intensify locally.



Typhoons and tropical depressions are also marked as "Low" (low-pressure systems) on the map.

From the day after tomorrow, the 27th (Sunday), onwards, the autumn rain front is expected to remain stationary near the southern coast of Honshu. The Kanto region will likely see predominantly rainy or cloudy weather. Current forecasts suggest that the movement of Typhoon No. 26 will slow down near the Nansei Islands. With the autumn rain front positioned to the north of the typhoon, the warm, moist air flowing from the storm could intensify the front's activity. Localized heavy rainfall is possible around the front, so please remain cautious of the changing weather conditions. While there is still some uncertainty regarding the typhoon's path, one model (as shown in the weather map above) predicts that the typhoon will move east-northeast along the southern coast of Honshu between Friday, October 2, and Saturday, October 3. If it follows this trajectory, there is a risk of heavy rain caused by the typhoon's main rain clouds in the Kanto region.
Please check the latest weather forecasts and typhoon information, and take early precautions against heavy rain.



Regarding high temperatures, readings across the Kanto region are expected to drop significantly tomorrow, Saturday the 26th, compared to today, likely hovering just above 20C. You will need a long-sleeved outer layer.
Temperatures are expected to rise again around Tuesday the 28th, bringing back humid, sultry conditions.
Please adjust your clothing accordingly and take care to stay healthy.

# Impacts of prolonged or heavy rain and points of caution
The ground remains loose in some areas due to the heavy rain from the recent Typhoon No. 25. As rainy days are expected to continue, please avoid approaching dangerous slopes or cliffs.
Additionally, levee breaches in Chiba Prefecture have caused extensive flooding. When carrying out recovery work, please prioritize your personal safety and check the latest weather forecasts before proceeding.
# Management of fields and crops
Heavy rains?including those from the recent Typhoon No. 25?have caused damage such as field inundation and flooding of greenhouses, particularly in Chiba Prefecture.
Rainy weather is forecast to continue, and there is a risk of further heavy rain depending on frontal activity and the path of Typhoon No. 26.
It is advisable to inspect and clear drainage systems of any blockages caused by the recent heavy rains to prepare for future downpours. Prolonged rain and high humidity create conditions favorable for the spread of crop pathogens and pests, so you will likely need to take measures to address these issues.
Please also exercise great caution when entering muddy areas?whether for recovery efforts or routine farm work?or when operating agricultural machinery, as these situations can be hazardous.
When working, be sure to check the latest weather forecasts and prioritize your personal safety; also, take precautions against heatstroke by staying hydrated.

Typhoon No. 26 (Surigae): Risk of approaching Okinawa with strong intensity heading into the start of the week.

2026/09/25 06:59

As of 6:00 a.m. today, the 25th, Typhoon No. 26 is located east of the Philippines and is moving west-northwest at a speed of approximately 20 km/h.

? Typhoon No. 26: 6:00 a.m., Friday the 25th
==================
Center location: East of the Philippines
Movement: West-northwest at 20 km/h
Central pressure: 1000 hPa
Max. wind speed: 20 m/s (near center)
Max. instantaneous wind speed: 30 m/s
==================



As the typhoon moves through waters with high sea-surface temperatures, it is expected to intensify while traveling west-northwest. By Sunday the 27th, it is forecast to reach "strong" intensity and move south of Okinawa, accompanied by a zone of gale-force winds. Subsequently, it is expected to shift its course from a northerly to a more easterly direction, moving south of Japan by Tuesday the 29th.

The typhoon is expected to slow down as it approaches Okinawa, raising concerns about prolonged impacts. Effects are likely to begin around Sunday the 27th; depending on the typhoon's path and intensity, there is a risk of severe weather conditions.
Please make good use of the sunny spells expected through tomorrow and take early precautions against the typhoon in preparation for the prolonged impact.

Weather for today, Friday the 25th: Sunny and calm in Northern Japan; mostly cloudy from Eastern to Western Japan.

2026/09/25 06:30

Although a high-pressure system will cover the area around Japan today, the 25th, the influence of moist air means skies will be mostly cloudy across regions from Eastern to Western Japan.



Northern Japan will enjoy sunny and mild weather. This morning, Numakawa in Hokkaido recorded a low of -0.4C, marking the first sub-zero temperature of the season (excluding Mount Fuji). Daytime highs will reach around 20C, making for comfortable conditions, though you should be mindful of the temperature difference between morning/evening and midday.
Additionally, there is a chance of passing showers in the southern Tohoku region during the morning, so it would be wise to carry a folding umbrella when heading out.

From Eastern to Western Japan, clouds will spread, but there will also be sunny spells during the day. Daytime temperatures will be high, particularly in Western Japan, where they are expected to reach around 30C; please take precautions against heatstroke. In the Kanto region, temperatures will hover around 26C?avoiding extreme heat?but it may feel somewhat muggy. As the area of ??rainfall expands into the evening, those returning home late should carry rain gear.

Okinawa will see sunny skies in many areas. However, as passing showers may occur in the afternoon, please keep an eye on changing weather conditions.

How far will the floodwaters reach in your town? What a flood hazard map reveals.

2026/09/24 15:26

Have you ever looked at a hazard map?
These maps, created and published by local governments, show information such as local disaster risks, evacuation sites, and evacuation routes to help people prepare for natural disasters.
They provide crucial information that allows you to understand potential disaster risks in advance and take immediate, decisive action to evacuate when the need arises.

Among these, "flood hazard maps" use color-coding to indicate which areas might flood?and to what extent?in the event of heavy rain causing rivers to swell or levees to breach.
You can view them via paper maps distributed by local governments or online.
If you search for the Geospatial Information Authority of Japan's "Overlay Hazard Map" (Kasaneru Hazard Map), you can view various disaster risks layered together on a single map.





The colored areas on the map indicate zones where flooding is predicted to occur.

The phenomenon of urban areas, houses, and fields being covered by water is known as *shinsui* (inundation/flooding),
and the depth of the water (measured from the ground surface to the water level) is referred to as *shinsui-shin* (inundation depth).
These maps allow you to see at a glance how far the water might spread and how deep it could get in your area during a flood.



*Note: When roads or farmland are covered by water, the term *kansui* (surface flooding/submergence) is sometimes used.


In addition to flood hazard maps, there are also hazard maps for "internal flooding" (which occurs when rainfall exceeds the drainage capacity of the sewer system) and for sediment-related disasters (such as landslides). Depending on the region, some local governments create hazard maps covering various types of disasters?such as volcanic eruptions, tsunamis, storm surges, and irrigation pond failures?so be sure to check what is available in your area.

Hazard maps are a vital tool for disaster preparedness.



Reviewing these maps during normal times?before a disaster strikes?enables you to act without hesitation when an emergency occurs.
Use them as a starting point for discussions with your family and those close to you about important details, such as which evacuation shelter to go to and which routes to take.

Weekly Weather: Stationary Front Over Honshu from the Weekend (Saturday, the 26th); Keep a Close Watch on Typhoon No. 26

2026/09/24 13:23

Looking ahead, an autumn rain front is likely to stall near Honshu starting this weekend, specifically from Saturday the 26th. Please also keep a close watch on the movement of Typhoon No. 26, which is tracking westward south of Japan.



Tomorrow, Friday the 25th, the region will be under the influence of a high-pressure system; many areas will see sunshine, making it a rare, pleasant day. However, in areas along the Pacific coast of Eastern Japan, clouds are likely to spread due to the influence of humid easterly winds.

An autumn rain front will gradually approach Honshu from the Asian continent. From Saturday the 26th onwards, the front is expected to stall near Honshu. The weekly forecast indicates a trend of prolonged wet weather, with cloudy skies or rain expected across the country.



Meanwhile, Typhoon No. 26 is moving westward over the waters south of Honshu, east of the Philippines. As it travels through waters with high sea-surface temperatures, the typhoon is expected to intensify; it is projected to reach the waters south of Okinawa by around Saturday the 26th, accompanied by a zone of gale-force winds. Subsequently, it is expected to strengthen while gradually shifting to a more northerly course. By Sunday the 27th, it is forecast to approach Okinawa Main Island and the Sakishima Islands with "strong" intensity?defined by maximum sustained winds near the center exceeding 35 m/s.
Consequently, rough weather is expected in the Nansei Islands starting around the 27th, and residents should be on alert for heavy rain, gale-force winds, and high waves. Around Honshu, moist air flowing from Typhoon No. 26 into the autumn rain front is expected to create conditions conducive to the development of rain clouds, particularly across western and eastern Japan. As the front intensifies, caution is advised regarding localized heavy rainfall. In particular, regions along the Pacific coast of eastern Japan?which have just experienced heavy rain associated with Typhoon No. 25?may face further heavy rainfall; please stay alert for the latest weather updates.

Significant temperature fluctuations in central Tokyo; be mindful of the temperature swings.

2026/09/23 12:57

Temperatures in Tokyo have fluctuated significantly over the past few days, so please be mindful of potential health issues caused by these daily temperature swings.



On Saturday the 19th?the start of "Silver Week"?Typhoon No. 25 moved northward south of Japan. It passed along the southern coast of the Kanto region between Sunday the 20th and Monday the 21st, bringing record-breaking heavy rainfall, particularly to the southern part of Kanto. During this period, central Tokyo experienced persistent rain and high temperatures hovering around 24C, which is lower than the seasonal average.
In contrast, yesterday (the 22nd)?after the typhoon had passed and skies cleared?sunshine returned and temperatures rose sharply. Central Tokyo recorded a high of 31.6C, an increase of 7.3C from the previous day. Many other locations in southern Kanto also exceeded 30C, marking a "mid-summer day" (a day with a high of 30C or above) across the region.

Today, the 23rd, cloudy skies and rain prevail due to a trough of low pressure. At noon, the temperature in central Tokyo was 20.3C?down 9.5C from the same time yesterday?marking another significant shift in temperature.
However, the influence of the low-pressure trough will diminish tomorrow, the 24th. With sunshine expected during the day, the high is forecast to reach 30C, making it another mid-summer day.

With such drastic temperature fluctuations over the past few days, it is easy for your health to suffer. Please take care of yourself by maintaining a balanced diet, getting sufficient sleep, and incorporating moderate exercise to stay healthy.

Tropical depression east of the Philippines; forecast to develop into a typhoon within the next 24 hours.

2026/09/23 12:26

Today, Wednesday the 23rd, a tropical depression is moving across the waters east of the Philippines.
There is now a possibility that this tropical depression will intensify into a typhoon within the next 24 hours.



Generally, tropical depressions and typhoons tend to form and develop in waters where the sea surface temperature is 26.5?27 C or higher, and they are likely to gain greater strength in waters where temperatures reach 28?30 C or above. This is because higher sea surface temperatures provide a greater supply of water vapor, which serves as the energy source for these storms.
As of the 22nd, the sea surface temperature east of the Philippines was 30 C, and the tropical depression is expected to move through this area of ??warm water.



The tropical depression is forecast to move westward across the waters east of the Philippines; current projections indicate it will become a typhoon by tomorrow morning. After becoming a typhoon, it is expected to gradually shift its course toward the northwest and intensify by around the 26th, accompanied by a zone of gale-force winds (speeds of 25 m/s or higher). It will gradually approach Okinawa and the Sakishima Islands, and by around the 28th, it is predicted to reach "strong" intensity, with maximum sustained winds near its center exceeding 35 m/s.

Forecasts regarding its subsequent path involve significant uncertainty; scenarios range from the storm continuing toward the Asian mainland to it turning northward and approaching the main Japanese islands (Honshu). Please stay tuned for the latest typhoon updates.

Weather for tomorrow, Wednesday the 23rd: Sunny across a wide area, but clouds will dominate from Kanto to Kinki; watch out for passing showers.

2026/09/22 17:53

Tomorrow, Wednesday the 23rd?the final day of the long weekend?high pressure will cover much of the region near Japan, bringing sunny skies to many areas. However, due to a low-pressure system off the coast of Tokai, skies are likely to be mostly cloudy across the region stretching from Kanto to Kinki.



Northern Japan will enjoy crisp, clear autumn weather. Conditions will be ideal for going out. Please take care of your health, as there will be a significant difference between morning/evening and daytime temperatures.

Sunny, blue skies will also prevail across the Hokuriku, Chugoku, Shikoku, and Kyushu regions. Daytime temperatures are expected to reach around 30C, particularly in western Japan; please be sure to take precautions against the heat when heading out.

Meanwhile, from Kanto to Kinki, clouds will spread due to the influence of a low-pressure system and a shear line, bringing a chance of passing showers. It would be wise to carry a folding umbrella when going out on this final day of the holiday. Temperatures in the Kanto region will not rise significantly, hovering around 25C in many areas.