[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.

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.

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.

Weekly weather: Cloudy and rainy weather is likely to continue. Be careful of tropical depressions during Silver Week.

2026/09/14 07:46

From now on, cloudy and rainy days are expected to continue from Tohoku to Kyushu, and it seems there will be many unrefreshing weather days. In Hokkaido, the forecast is for relatively stable and mostly sunny days.



Tomorrow, the 15th (Tuesday), the autumn rain front will gradually move south, and the front's activity is expected to intensify. Rain will fall over a wide area from Tohoku to Kyushu. In some localized areas, the rain is likely to become heavy and may be accompanied by thunder. Please be very careful of road flooding and water accumulation in low-lying areas.

After that, the main island of Japan will continue to be influenced by humid air, and cloudy or rainy days are expected nationwide. Even if there are sunny periods during the day, the weather will be changeable due to the humid air, so please pay attention to changes in the sky. Because of the long-lasting rain so far, the ground may be loose in some places, increasing the risk of landslides even with a little rain. Please stay away from dangerous slopes and cliffs.

Also, there is a tropical depression in the southern sea area of Japan, which is expected to take a westerly path and travel south of the main island. It is not expected to develop into a typhoon yet, but it could significantly affect the weather in the future.

This weekend from the 19th (Saturday), Silver Week will start, but depending on the development and path of the tropical depression and the movement of the autumn rain front near the main island, the weather could change significantly. If you have plans during the holiday, be sure to check the latest weather updates regularly.

Today's weather forecast for the 14th (Mon): due to the front, it will be cloudy or rainy over a wide area. Kanto-Koshin will be sunny and perfect for doing laundry.

2026/09/14 07:00

Today, Monday the 14th, the autumn rain front will remain stationary around Honshu. Also, a cold front extending from a low-pressure system moving across the continent is expected to pass near Hokkaido.



Because of this, around Honshu, the range of rain is likely to expand from northern to western Japan on the Japan Sea side. Especially in Tohoku and Hokuriku, it is expected to be a path for developing rain clouds associated with the autumn rain front, and there may be places with heavy rain accompanied by thunder. Please be careful and stay alert for landslides, flooding in low-lying areas, and sudden rises in rivers.



On the Pacific side of western Japan, it may be sunny during the day in some areas, but there may also be localized rain or thunderstorms. Be careful of heavy rain in a short time, lightning, and strong gusts such as tornadoes.
In Okinawa, rain clouds are likely to develop due to moist air, resulting in weather with intermittent rain.

In Kanto-Koshin, many places will be sunny from the morning, making it a good day for doing laundry. Temperatures will be higher than the previous day, the 13th, and the lingering summer heat will be intense, with a forecasted 35C in Kumagaya (Saitama Prefecture). Please take measures against heatstroke.
In the mountainous areas of Kanto, there is a possibility of localized thunderstorms in the afternoon. Pay attention to changes in the sky.