[Typhoon Information] Typhoon No. 27 threatens to approach the Ogasawara Islands with very strong intensity; caution advised regarding high waves along the Pacific coast of Honshu.

2026/10/04 06:17

As of 3:00 a.m. today, Sunday the 4th, Typhoon No. 27 (Choi-wan)-a large and very strong storm-is located in the waters near the Ogasawara Islands. It is moving northeast at approximately 15 km/h, accompanied by a gale-force wind zone. The typhoon has a central pressure of 945 hPa, with maximum sustained winds of 45 m/s and peak gusts of 60 m/s; gale-force winds of 25 m/s or higher are occurring within a 150 km radius of the center.

Typhoon No. 27 is expected to intensify further as it moves northward. It may approach the Ogasawara Islands while maintaining its "very strong" intensity between the evening of tomorrow, Monday the 5th, and early Tuesday the 6th.
Subsequently, it is forecast to move northward off the east coast of Japan and transform into an extratropical cyclone east of the Kuril Islands on Thursday the 8th.

# Typhoon No. 27 Sunday the 4th, 3:00 AM
------------------------------------
Size: Large
Strength: Very strong
Center location: Waters near the Ogasawara Islands
Movement: Northeast at 15 km/h
Central pressure: 945 hPa
Max. wind speed: 45 m/s (near the center)
Max. gust speed: 60 m/s
------------------------------------

Rough seas accompanied by swells are expected in the Ogasawara Islands through Tuesday the 6th; please exercise caution regarding high waves.
Very strong winds are expected from tomorrow, Monday the 5th, through Tuesday the 6th; please be alert and take precautions against strong winds.

Additionally, due to warm, moist air surrounding the typhoon and developed rain clouds associated with the storm itself, heavy rain is likely in some areas from late Monday night (the 5th) through Tuesday the 6th. Depending on the typhoon's path and intensity, there is a possibility of heavy rainfall reaching warning levels. [Wave Forecast: Ogasawara Islands]
Forecast wave height for the 4th (Sun):
6m (with swells)
Forecast wave height for the 5th (Mon):
8m (with swells)
Forecast wave height for the 6th (Tue):
8m (with swells)

[Wind Forecast: Ogasawara Islands]
Forecast maximum wind speed (peak instantaneous wind speed) for the 5th (Mon):
23 m/s (35 m/s)
Forecast maximum wind speed (peak instantaneous wind speed) for the 6th (Tue):
23 m/s (35 m/s)

[Rain Forecast: Ogasawara Islands]
Forecast hourly rainfall for the 5th (Mon) (maximum in some areas):
30 mm
Forecast 24-hour rainfall from 06:00 on the 5th (Mon) to 06:00 on the 6th (Tue) (maximum in some areas):
100 mm
Forecast 24-hour rainfall from 06:00 on the 6th (Tue) to 06:00 on the 7th (Wed) (maximum in some areas):
50 mm




Although the system is currently expected to pass at a distance from Honshu, wave heights will gradually increase along the Pacific coast of Northern and Western Japan, leading to rough sea conditions in some areas. Please refrain from approaching the coast, even if the weather appears calm. Depending on the storm's path, winds may also strengthen along the coast near the Kanto region around Tuesday, the 6th. Please stay tuned for further updates.

Please pay attention to disaster prevention weather information issued in the future.

Why Did the Kanto Region Experience Prolonged Rain in September? Causes and the Outlook for October

2026/10/03 23:05

September saw record-breaking, prolonged rainfall in areas such as Tokyo, with gloomy weather persisting throughout the month. Why did the rain continue for so long? Will this type of weather persist, or can we look forward to crisp, clear autumn days in October?

On October 1, the Japan Meteorological Agency (JMA) released a report titled "Regarding the Record-Breaking Heavy Rainfall and Lack of Sunshine on the Pacific Side of Eastern Japan in September and the Outlook Ahead."

For the Pacific side of Eastern Japan, September saw the highest monthly precipitation and the lowest monthly sunshine duration since record-keeping began in 1946.
This record-breaking weather was caused by the influx of warm, moist air along the periphery of a dominant high-pressure system (merged with the Pacific High) and the eastern edge of a large-scale low-pressure area south of Japan; this fueled intense activity in the autumn rain front, which remained stalled near Honshu.

# Weather Conditions
On the Pacific side of Eastern Japan, monthly precipitation for September reached 236% of the seasonal average?the highest level since regional statistics began in 1946 (surpassing the previous record of 182% set in 1982). Twelve observation sites, primarily in the southern Kanto region, recorded their highest monthly precipitation totals on record.
Additionally, monthly sunshine duration was significantly low, falling to 46% of the seasonal average?the lowest level since 1946 (surpassing the previous record of 54% set in 1988).


# Characteristics of Atmospheric Circulation
The westerlies near Japan were significantly stronger than average, particularly over the waters east of the country, creating conditions conducive to updrafts in the vicinity of Honshu.
In addition, a dominant high-pressure system?merged with the Pacific High?stagnated east of Japan, while an autumn high-pressure system extended from the Asian continent; this resulted in a significant north-south temperature gradient across Honshu.
This pressure pattern persisted throughout the month, with the autumn rain front stalling near Honshu for extended periods. Furthermore, the activity of the autumn rain front intensified greatly due to a continuous influx of warm, moist air from the sea, channeled along the periphery of the Pacific High and the eastern edge of a large-scale low-pressure zone south of Japan.
Typhoon No. 25 also moved northeastward over the waters south of the Kanto region, tracking along the edge of the Pacific High.



# Outlook
While the season for typhoons and autumn rains continues, weather conditions across the country are expected to fluctuate in cycles of a few days throughout October, with more sunny days than average. Consequently, it is unlikely that the current conditions of high precipitation and limited sunshine on the Pacific side of Eastern Japan will persist.

Even in regions like Kanto that have experienced prolonged spells of rain, we can look forward to crisp, clear autumn days in October. However, autumn weather tends to shift in cycles lasting a few days, so there will likely be times when conditions are influenced by low-pressure systems or weather fronts. Additionally, October is a month when typhoons typically still form and may approach or make landfall in Japan. As there is a possibility of localized heavy rainfall, please stay updated with the latest weather information and be prepared for potential heavy rain.

[First time in 77 days] Tokyo set for pleasant weather all weekend; long spell of rain finally takes a break — Weather forecast for today and tomorrow

2026/10/03 13:54

The long stretch of rainy days that began in August is finally coming to an end.
Today, Saturday the 3rd, Tokyo is expected to be sunny as a high-pressure system from the Asian continent moves in. This marks the first sunny Saturday in eight weeks?the last one was August 8th.
If precipitation remains at zero for both Saturday and Sunday, it will be the first weekend suitable for outings in 77 days, since July 18th?19th.



Weather for Today, Saturday the 3rd
A high-pressure system from the continent is covering a large area around Honshu, bringing sunny skies to much of the region.
The Kanto region will also enjoy ideal weather for outings?a welcome change?and Tokyo looks set to break the streak of consecutive days with rainfall that has persisted since August 26th.
In Hokkaido, unsettled weather continues due to a low-pressure system near the Kuril Islands; however, conditions are expected to improve as the continental high-pressure system moves in.



Weather for Tomorrow, Sunday the 4th
The continental high-pressure system will continue to cover the area around Honshu, bringing sunny skies to a wide region.
However, weather conditions are expected to deteriorate across Kyushu, western Shikoku, and the Chugoku region due to a front extending near the Nansei Islands.
Sunny weather will persist in Kanto, and Tokyo is expected to enjoy another day suitable for outings, just like today.

Looking ahead, the influence of a migratory high-pressure system means we can expect more days of crisp, pleasant autumn sunshine across the country.

Weekly Weather: Cloudy or rainy in many areas early next week; Pacific side should monitor the path of Typhoon No. 27.

2026/10/03 13:18

High and low-pressure systems will alternate passing near Honshu, leading to weather changes occurring in cycles of a few days. Please keep a close watch on the movement of Typhoon No. 27, particularly if you are on the Pacific side.



Tomorrow, the 4th (Sunday), much of Honshu?especially Northern and Eastern Japan?will see sunny skies. In contrast, Western Japan will experience a deterioration in weather due to a front approaching from the Asian mainland; rain is likely to begin gradually in the afternoon across Kyushu and the Chugoku and Shikoku regions. This area of ??rain is expected to spread into the Kinki region by the 5th.

On the 5th (Monday), a low-pressure system accompanied by a front will move along the Sea of ??Japan side, bringing rain to parts of Northern Japan as well. As the front extending from the low passes over Honshu, rain is forecast for the 6th (Tuesday) along the Sea of ??Japan coast from Northern to Western Japan; however, the rainfall will be brief, and conditions will improve in many areas once the front has passed. Subsequently, the region will come under the influence of a high-pressure system, bringing sunny weather to many areas.



Meanwhile, as of noon today, the 3rd (Saturday), the large and strong Typhoon No. 27 is moving near the Mariana Islands. The typhoon is expected to continue intensifying as it moves northward and approaches the Ogasawara Islands. The Ogasawara Islands may experience severe weather from the 5th through the 6th; please remain alert for strong winds, high waves accompanied by swells, and heavy rain.



Current forecasts indicate a low probability of Typhoon No. 27 making landfall on Honshu; however, coastal areas stretching from Northern to Western Japan will continue to experience high waves due to the typhoon's influence. Additionally, depending on the typhoon's future path, developed rain clouds may move over the Pacific coast of the Tohoku region and the Kanto coastal areas, potentially causing temporary heavy rainfall. Please stay updated on the latest typhoon information.




Looking ahead, daytime high temperatures will generally be around or slightly above average for this time of year. Around the 6th, the influence of Typhoon No. 27 will likely lead to slightly higher daytime temperatures in Eastern and Northern Japan, with some areas reaching 30 degrees Celsius or higher.
Significant temperature differences between morning and midday are expected in many regions; in Northern Japan, morning lows may drop below 10 degrees Celsius in some areas. Please take care to manage your health amidst these daily temperature fluctuations.

[Typhoon No. 27 Moving North] Ogasawara Islands Face Risk of Rough Seas and Violent Winds from the 4th to the 6th

2026/10/03 05:19

Typhoon No. 27, a large and powerful storm,
was located near the Mariana Islands at 3:00 a.m. on the 3rd and is moving northward at a speed of 15 km/h. It has a central pressure of 970 hPa, with maximum sustained winds of 35 m/s near the center and peak gusts reaching 50 m/s.
The typhoon is expected to intensify as it moves north, potentially passing near the Ogasawara Islands with very strong intensity between the 5th (Monday) and the 6th (Tuesday).



In the Ogasawara Islands, caution is advised regarding high waves accompanied by swells from the 4th (Sunday) through the 6th (Tuesday).
Wave heights may also increase along the Pacific coast of Honshu.

Additionally, please be alert for strong winds from the 5th (Monday) to the 6th (Tuesday),
and be aware of the potential for warning-level heavy rainfall around the 6th (Tuesday).



[Wave Forecast]
Forecast wave height for the 4th (Sunday):
Ogasawara Islands: 6 meters (accompanied by swells)
Rough sea conditions with swells are expected to persist through the 6th (Tuesday).

Please stay updated with the latest typhoon information,
and take early precautions before the winds intensify.

Sunny tomorrow (Sat)—a chance to prepare for winter; weather to deteriorate from the west on Sunday.

2026/10/02 20:21

"Due to a high-pressure system centered near the Asian mainland extending toward Honshu,
sunny skies are expected across a wide area tomorrow, Saturday the 3rd.



While lingering rain or snow is expected in parts of Hokkaido due to a low-pressure system near Sakhalin,
the weather is expected to remain stable across Honshu.



It has been a while since we've had plenty of sunshine over the weekend.
It will be a great opportunity to hang out accumulated laundry
or air out your futons.
However, mornings and evenings are expected to get colder nationwide after the weekend.
We recommend getting your winter bedding ready
or switching to your winter wardrobe this Saturday.



On Sunday, a front moving east from the mainland will cause the weather to deteriorate, starting from the west.
Rain will begin in parts of western Japan, so you will likely need your umbrellas again."

FTyphoon No. 27 is forecast to move northward; remain cautious of typhoons in October as well. Pacific Coast May See Stormy Conditions Next Week (Analysis by Meteorologist Junko Miyake)

2026/10/02 19:09

As of 4:00 PM on October 2, Typhoon No. 27 is located near the Mariana Islands and is moving slowly north-northwest. Satellite imagery shows a cluster of developed cumulonimbus clouds.

Typhoon No. 27 (As of 4:00 PM, Oct. 2)
Location: Near the Mariana Islands
Path: North-northwest
Speed: Slow
Central pressure: 985 hPa
Maximum wind speed: 25 m/s
Peak gust speed: 35 m/s

The typhoon is expected to continue moving north toward the waters near the Ogasawara Islands while intensifying, reaching "very strong" status by the day after tomorrow, the 4th (Sunday). It is then expected to move north past the east side of the Ogasawara Islands while maintaining its strength, eventually heading toward the waters east of Japan by the 7th.

Waves of 6 meters are forecast for the Ogasawara Islands on the 4th (Sunday), bringing rough seas accompanied by swells. These rough seas and swells are expected to persist through around the 6th. Please exercise caution and remain alert for strong winds from the 5th through the 6th. Caution regarding high waves is also advised for the Izu Islands from the 6th to the 7th.

Additionally, a high-pressure system originating from the continent is forecast to shift its center to the area east of Japan on the 4th (Sunday). Due to the combined influence of a typhoon and a high-pressure system, strong easterly winds will blow over the waters east of Japan; consequently, caution is advised regarding strong winds and high waves accompanied by swells along the Pacific coast of eastern and western Japan from the 3rd to the 4th.

Weather Forecast for This Weekend: Autumn Sunshine Expected in Kanto; Conditions to Deteriorate in Western Japan on Sunday the 4th

2026/10/02 18:15

This weekend?Saturday the 3rd and Sunday the 4th-is expected to bring sunny spells and ideal weather for going out, even to the Kanto region, which has seen a streak of rainy days since last month.
On Sunday the 4th, however, a front will approach from the west, likely bringing a high chance of rain to Western Japan.



Tomorrow, Saturday the 3rd, a high-pressure system from the Asian continent will move over the Sea of Japan, and the area around Japan is expected to gradually come under the influence of high pressure.

In Hokkaido, rain will fall in some areas-particularly along the Sea of Japan coast-but the weather will gradually improve.

The Sea of Japan side of the Tohoku region and the Hokuriku region will start off cloudy, but sunny spells are expected to emerge as the day progresses.

In the Kanto region and Shizuoka Prefecture, humid air may cause clouds to spread at times, but the weather will generally be sunny. For areas like Tokyo that have experienced a stretch of cloudy or rainy days, this looks like a great opportunity to do laundry, air out bedding, or go for a walk.

The Pacific side of Tohoku and the region stretching from Tokai to Kyushu will also generally see sunny weather.
Okinawa, however, may experience some rain due to the influence of humid air.

The day after tomorrow, Sunday the 4th, Northern and Eastern Japan will be under the influence of high pressure, resulting in sunny skies for many areas.
In Western Japan, a front is expected to extend from the East China Sea, causing clouds to gradually spread. By the afternoon, rain is likely to begin in parts of Kyushu, Chugoku, and Shikoku.

Regarding high temperatures on Saturday the 3rd: Hokkaido will remain under the influence of cold air, with Sapporo seeing a low high of 16C, while many other regions will experience temperatures around or above the seasonal average. Temperatures are forecast to reach 30C or higher?marking a "midsummer day"-in Kagoshima tomorrow (Saturday), and in Naha both tomorrow (Saturday) and the day after (Sunday); therefore, anyone engaging in exercise or outdoor work should continue to take precautions against heatstroke.
Additionally, as there will be significant temperature differences between the daytime and the morning or evening, please be sure to have an extra layer of clothing on hand so you can adjust accordingly.

Weather Forecast for This Weekend: Autumn Sunshine Expected in Kanto; Conditions to Deteriorate in Western Japan on Sunday the 4th

2026/10/02 18:12

This weekend?Saturday the 3rd and Sunday the 4th?is expected to bring sunny spells and ideal weather for going out, even to the Kanto region, which has seen a streak of rainy days since last month.
On Sunday the 4th, however, a front will approach from the west, likely bringing a high chance of rain to Western Japan.



Tomorrow, Saturday the 3rd, a high-pressure system from the Asian continent will move over the Sea of Japan, and the area around Japan is expected to gradually come under the influence of high pressure.

In Hokkaido, rain will fall in some areas?particularly along the Sea of Japan coast?but the weather will gradually improve.

The Sea of Japan side of the Tohoku region and the Hokuriku region will start off cloudy, but sunny spells are expected to emerge as the day progresses.

In the Kanto region and Shizuoka Prefecture, humid air may cause clouds to spread at times, but the weather will generally be sunny. For areas like Tokyo that have experienced a stretch of cloudy or rainy days, this looks like a great opportunity to do laundry, air out bedding, or go for a walk.

The Pacific side of Tohoku and the region stretching from Tokai to Kyushu will also generally see sunny weather.
Okinawa, however, may experience some rain due to the influence of humid air.

The day after tomorrow, Sunday the 4th, Northern and Eastern Japan will be under the influence of high pressure, resulting in sunny skies for many areas.
In Western Japan, a front is expected to extend from the East China Sea, causing clouds to gradually spread. By the afternoon, rain is likely to begin in parts of Kyushu, Chugoku, and Shikoku.

Regarding high temperatures on Saturday the 3rd: Hokkaido will remain under the influence of cold air, with Sapporo seeing a low high of 16C, while many other regions will experience temperatures around or above the seasonal average. Temperatures are forecast to reach 30C or higher?marking a "midsummer day"?in Kagoshima tomorrow (Saturday), and in Naha both tomorrow (Saturday) and the day after (Sunday); therefore, anyone engaging in exercise or outdoor work should continue to take precautions against heatstroke.
Additionally, as there will be significant temperature differences between the daytime and the morning or evening, please be sure to have an extra layer of clothing on hand so you can adjust accordingly.

Kanto Heading into a Clear Autumn Weekend: Typhoon No. 27 Strengthens as It Moves North — Ogasawara Islands Urged to Prepare(Commentary by Meteorologist Junko Miyake)

2026/10/02 15:01

Rain fell again today in Tokyo, marking 37 consecutive days with precipitation.
It looks like this long stretch of rainy days will finally come to an end tomorrow.

Tomorrow (Saturday), a high-pressure system is expected to extend from the Asian continent.
Much of the Kanto region will likely see clear autumn skies.
Dry air will cover the area, bringing a crisp and pleasant feel to the weather truly a classic autumn day.

Typhoon No. 27
Now let's take a look at Typhoon No. 27 over the southern seas.
The typhoon is currently near the Mariana Islands, moving westward.
Its maximum sustained winds near the center are 23 m/s, and it is expected to develop a storm-force wind area soon.

By tomorrow (Saturday), it is forecast to strengthen into a "strong" typhoon,
and from Sunday the 4th onward, it is expected to intensify further into a "very strong" typhoon.

On Monday the 5th, the central pressure is projected to drop to 925 hPa.
While maintaining this very strong intensity, the typhoon is expected to approach the Ogasawara Islands quite closely between Monday the 5th and Tuesday the 6th.

After that, on Wednesday the 7th, it is forecast to weaken slightly while moving northward over the sea east of the Kanto region.

Impacts and Warnings
Due to the approaching typhoon, there is already mention of potential warning-level conditions.
In the Ogasawara Islands, waves will begin to rise on Sunday afternoon.
On Monday the 5th, winds will strengthen and storm-force conditions are expected.
By Tuesday the 6th, rain clouds associated with the typhoon's core may bring heavy rainfall.

In the Izu Islands, from Tuesday the 6th through Wednesday the 7th,
and along the Pacific side of the Kanto region on Wednesday the 7th,
waves are also expected to become high.

Since the typhoon will approach the Ogasawara Islands with very strong intensity,
residents should secure any objects that could be blown away over the weekend as part of early preparations.

Weekend Weather in the Kanto Region
On Saturday, many areas will experience clear autumn skies.
It will feel a bit chilly in the morning, so a light jacket will be useful,
but temperatures will rise above 25C in many places during the day a warm, short-sleeve kind of day.

On Sunday, clouds will be more widespread,
but rain is not expected to begin.

Weekly Outlook
At the start of next week, clouds will increase again.
Due to the influence of a front and moist air, unsettled weather is likely to return.
Depending on the typhoon's track, winds may strengthen even in the Kanto region around midweek.

Since the forecast track may change, please continue to check the latest updates.