Rough seas around Typhoons 26 and 27 and a low-pressure system associated with a front [Marine Summary: September 27 – October 3, 2026]

2026/10/07 15:14

After moving northward south of Okinawa, Typhoon No. 26 traveled northeastward south of Japan, causing rough to very rough seas near its center. In the latter part of the period, Typhoon No. 27 moved westward across the Mariana Islands before turning northward, causing high waves in its vicinity.
Meanwhile, low-pressure systems accompanied by fronts moved northeastward at regular intervals from the sea of Japan and Primorsky Krai, resulting in rough seas in parts of the northern sea of Japan and the sea of Okhotsk.

Regarding sea surface temperatures in waters near Japan, an area with temperatures significantly higher than normal expanded off the southeastern coast of Hokkaido, reaching a peak of 5C above average.

Summary of ocean conditions (September 27 - October 3, 2026):



# Pressure Patterns and Waves
From September 27 to October 1, Typhoon No. 26 moved northward south of Okinawa and then northeastward south of Japan.
From the 28th to the 30th, a low-pressure system moved from the sea of Japan across the sea of Okhotsk to the area east of the Kuril Islands.
Rough to very rough seas developed near the typhoon's center. High waves occurred around the low-pressure system and its associated front, resulting in rough seas in the northern sea of Japan on the 29th and in the sea of Okhotsk on the 30th.
On October 1-2, a low-pressure system moved northward from the vicinity of Primorsky Krai to Sakhalin.
On the 2nd and 3rd, a low-pressure system moved northeastward east of the Kuril Islands.
High waves occurred around the low-pressure system and front, causing rough seas in the Mamiya Strait (Tatar Strait) on the 1st and in the sea of Okhotsk on the 3rd.
From the 1st to the 3rd, Typhoon No. 27 moved westward across the Mariana Islands before turning northward. Wave heights increased around the typhoon.



# Sea Surface Temperature
In the waters around Japan, the area with temperatures slightly above normal shrank in the north but expanded in the west.
In the East China Sea, the area with temperatures slightly above normal expanded.
Temperatures around the Nansei Islands remained near normal.
Off the coasts of Shikoku and Tokai, temperatures remained near normal, just as in the previous week.
East of the Kanto region, the area with temperatures above normal persisted.
Areas with temperatures above normal began to appear off the Sanriku coast.
Off the southeastern coast of Hokkaido, the area with temperatures significantly above normal expanded, reaching a peak of 5C above normal.
In the waters near the Kuril Islands and in the sea of Okhotsk, areas with temperatures slightly above normal persisted.

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Weather for Today, the 7th (Wed): Autumn sunshine across the region; pleasant weather during the day.

2026/10/07 06:08

Today, Wednesday the 7th, a migratory high-pressure system is expected to cover the area around Japan. Consequently, sunny skies will prevail across a wide area during the day.



In Northern Japan, clouds will linger along the Sea of ??Japan coast through the morning, but sunshine will gradually return. Along the Pacific coast, clear blue skies are expected to last all day. Daytime temperatures will hover around 20C in many areas, making for pleasant weather; however, please be mindful of the significant temperature difference between the day and the morning/evening hours.

In the Kanto region, skies will initially be cloudy with a chance of passing showers, but the weather is expected to improve and turn sunny as the afternoon progresses.
From the Tokai region through Western Japan, ample sunshine is expected, particularly along the Pacific coast. While humid air will cause cloudiness along the Sea of ??Japan coast, there will likely be some sunny spells. However, please keep an eye on changing weather conditions, as passing showers are possible there as well, especially in the morning. Daytime temperatures will reach around 25C in many locations, bringing dry, comfortable weather.

Sunny weather is also expected across much of Okinawa.

Sunny weather expected over the three-day weekend, mainly in eastern Japan; pleasant conditions ahead.

2026/10/06 19:07

As of 3:00 PM today, Tuesday the 6th, a strong high-pressure system is situated over the Asian continent. The pressure pattern resulting from the positioning of this high and Typhoon No. 27 is causing northerly winds to blow across the vicinity of Honshu.



The high-pressure system over the continent is expected to extend toward Honshu by tomorrow, Wednesday the 7th, and then move eastward while covering the area around Japan through Friday the 9th. Consequently, Thursday the 8th will likely see clear autumn weather across Northern and Eastern Japan. Daytime highs will reach 25C or higher (a "summer day") across a wide area spanning Western to Eastern Japan, making for a pleasant day.





During the three-day weekend (the 10th through the 12th), fair weather is expected, particularly in Eastern Japan, with many pleasant days ahead. However, on Saturday the 10th, the influence of moist air will likely cause cloudy skies to spread across the Pacific side of Western Japan, and some areas in southern Kyushu may see rain between the 9th and the 10th.

Typhoons 27, 28, and 29 Form Simultaneously; Coastal Areas Urged to Exercise Extreme Caution Against High Waves

2026/10/06 12:18

As of 9:00 a.m. on the 6th, large and strong Typhoon No. 27 is located near the Ogasawara Islands and is moving north at approximately 30 km/h. It has a central pressure of 950 hPa, with maximum sustained winds of 40 m/s and peak gusts of 60 m/s; gale-force winds of 25 m/s or higher extend up to 280 km east and 165 km west of the center.
The typhoon is expected to move northward near the Ogasawara Islands today (the 6th) and then proceed north-northeastward off the east coast of Japan through tomorrow (the 7th).



Due to the influence of Typhoon No. 27, caution is advised regarding high waves accompanied by swells:
- In the Ogasawara Islands, through the evening of the 6th;
- In the southern Izu Islands, from early afternoon through late at night.



High waves may crash onto the shore even if it is not raining. Please avoid approaching the coast unnecessarily.

Far to the southeast of Japan, Typhoon No. 28 is moving westward,
while Typhoon No. 29 is moving north-northwestward.



Depending on their future paths, these storms could affect the vicinity of Japan.
Please stay tuned for the latest information.

Weather for Today, Tuesday the 6th: Sunny Areas Gradually Expanding; Warm, Sweaty Weather for Western to Eastern Japan

2026/10/06 07:17

Today, Tuesday the 6th, sunny conditions will spread from the west, bringing sunshine to many areas stretching from the Kanto region westward. While rain is likely in the Hokuriku and Northern Japan regions until the morning due to the influence of a front, the weather is expected to improve during the day.





Regions from Western Japan to Kanto will be under the influence of a high-pressure system, leading to sunny skies in many areas during the day. Even in places like the Kinki region, where it is currently raining, blue skies are expected to gradually emerge.

Temperatures will rise during the day as warm air flows into the upper atmosphere. With the return of sunshine, temperatures will climb sharply; daytime highs will exceed 25 (a "summer day"), with Nagoya potentially reaching 29?just shy of a "mid-summer day" (30). Tokyo is also expected to reach 28, creating conditions where short-sleeved clothing will be comfortable. It may feel hot enough to work up a slight sweat in direct sunlight, so wearing layers that are easy to adjust is recommended.

From Hokkaido to Hokuriku, rain may persist until the morning due to the front. However, the weather will begin to improve from Hokkaido during the day, with more areas seeing sunshine.



Additionally, the Ogasawara Islands will be affected by Typhoon No. 27. Please be cautious of high waves and strong winds.

Typhoon No. 27 to weaken into an extratropical cyclone the day after tomorrow (the 7th); watch out for another typhoon ahead.

2026/10/05 19:05

As of 3:00 PM today, Monday the 5th, Typhoon No. 27?a large and very strong storm?is moving northward in the waters near the Ogasawara Islands. Rough seas currently prevail in the vicinity of the Ogasawara Islands, and caution regarding high waves is required through the morning of tomorrow, Tuesday the 6th. Meanwhile, seas around the Izu Islands are expected to become increasingly rough as the typhoon moves north; waves reaching up to 6 meters are forecast starting tomorrow afternoon. Please exercise sufficient caution regarding high waves.
Typhoon No. 27 is expected to maintain its strength while moving northeast?away from Japan?on Wednesday the 7th, eventually transforming into an extratropical cyclone by the evening. Caution and vigilance regarding strong winds and high waves are necessary along the Pacific coast of northern and western Japan through Wednesday.



Additionally, Typhoons No. 28 and No. 29 formed today, Monday the 5th.



As of 3:00 PM today, Monday the 5th, Typhoon No. 28 is located near the Midway Islands and is moving westward with very strong intensity. This typhoon originated from a tropical depression that formed off the coast of Mexico on Monday, September 14th (Japan time) and has traveled into Japan's monitoring region over the course of more than 20 days.


Satellite imagery reveals a distinct eye, surrounded by a dense ring of cumulonimbus clouds. Typhoon No. 28 is expected to continue moving westward; depending on its path, it could impact areas such as the Ogasawara Islands.



Meanwhile, as of 3:00 PM on the 5th (Monday), Typhoon No. 29 is located near the Marshall Islands and is moving north-northwest. While satellite imagery does not show a clearly defined structure, a concentration of cumulonimbus clouds is visible. Typhoon No. 29 is expected to shift its course toward the west and could approach the Ogasawara Islands with considerable strength.



Please continue to monitor the latest information regarding both Typhoon No. 28 and Typhoon No. 29.

Rain to spread across much of Honshu on the 5th (Mon.); rainfall expected to intensify in Shikoku; weather set to improve tomorrow.

2026/10/05 12:03

A low-pressure system over the Sea of ??Japan is moving northeast.
Typhoon No. 27, a large and very strong storm, is moving north-northwest near the Ogasawara Islands. A high-wave warning has been issued for the area, and caution regarding strong winds is also advised through tonight. The typhoon is expected to move over the waters east of Japan, causing wave heights to rise near Honshu between the 6th and 7th.
A high-pressure system east of the Kuril Islands is moving eastward, while a high-pressure system over the Asian continent is slowly moving southeastward.
The area around Honshu is situated in a pressure trough between these two high-pressure systems,
and is widely covered by clouds due to the influence of moist air.
Rain is currently falling in various locations, primarily from the Hokuriku region to Shikoku.



A small low-pressure system has formed near Shikoku, bringing active rain clouds and causing moderately heavy rain.
Rainfall is expected to intensify near Shikoku through this evening.



You will likely need a large umbrella throughout the day.



This small low-pressure system will dissipate by tonight,
and the weather is expected to gradually improve from the west tomorrow, the 6th (Monday).

While rain will linger in northern Japan,
sunshine is expected to return across a wide area stretching from eastern to western Japan.

[Breaking] Typhoons No. 28 and 29 Form: Rare Triple Typhoon Event

2026/10/05 11:01

Hurricane Nolo, located near the Midway Islands, crossed the 180th meridian and developed into Typhoon No. 28 (Nolo) at 10:05 AM today, Monday the 5th.
This is a rare "cross-basin" typhoon?an event occurring only once every few years?and it already possessed "very strong" intensity at the time of its designation.
Typhoon No. 28 is expected to continue moving westward while maintaining its "very strong" intensity.

Additionally, a tropical depression near the Marshall Islands developed into Typhoon No. 29 (Koguma) at 10:15 AM today, Monday the 5th.
Typhoon No. 29 is expected to move northwestward, intensify to "strong" status by the 9th, and approach the Ogasawara Islands.



With Typhoon No. 27 also currently located near the Ogasawara Islands, an unusual "triple typhoon" situation has emerged.
Predicting the paths of multiple typhoons in close proximity is extremely difficult and involves high uncertainty; therefore, the possibility that any of them could approach Japan cannot be ruled out. Please stay tuned for further typhoon updates.

New Typhoon Forecast to Form Within 24 Hours: Will Hurricane "NOLO" become a Rare "Cross-Basin Typhoon"?

2026/10/05 07:41

A tropical depression is currently located in the waters far southeast of Japan, near the Marshall Islands, and is moving east-northeast. There is a possibility that this tropical depression will develop into a typhoon within the next 24 hours.



This tropical depression is expected to intensify into a typhoon near the Marshall Islands by 3:00 AM tomorrow. Afterward, it is projected to take a westward path and reach "strong" intensity around the 9th.
While the forecast track keeps it well away from Japan, depending on future predictions, it could approach the Ogasawara Islands, potentially bringing gale-force winds and high waves. Please stay tuned for further updates.

Additionally, Hurricane "Nolo" is forecast to move westward from waters near Hawaii.

This hurricane originated as a tropical depression that formed in the eastern Pacific Ocean off the coast of Mexico on September 14 (Japan Standard Time). It has moved westward while fluctuating in intensity?strengthening and weakening?and is currently poised to cross the 180th meridian as a hurricane.



Agencies responsible for monitoring tropical cyclones are designated by region under the World Meteorological Organization (WMO). The Japan Meteorological Agency (JMA) classifies a tropical cyclone as a "typhoon" if it is located in the Northern Hemisphere between 100E and 180E longitude and has a maximum sustained wind speed near its center of 17.2 m/s or greater. In the Northern Hemisphere, these storms are referred to as "cyclones" in regions west of 100E East longitude and as "hurricanes" in regions east of 180E East longitude.

There is a possibility that Hurricane "NOLO" will cross 180E East longitude, enter the area monitored by the Japan Meteorological Agency, and be reclassified as a "typhoon."
Such "cross-basin typhoons" are rare occurrences, happening roughly once every few years; recent examples include Typhoon No. 8 in 2023 and Typhoon No. 17 in 2018.



The forecast path for Hurricane "NOLO" after it enters the Japan Meteorological Agency's monitoring zone involves significant uncertainty, and the possibility of it approaching Japan cannot be ruled out. Please stay tuned for further typhoon updates.

Weather forecast for today, Monday the 5th: Rain likely in many areas; large, very strong Typhoon No. 27 is moving northward near the Ogasawara Islands.

2026/10/05 06:25

Today, Monday the 5th, humid air will cause clouds to spread across the region near Honshu, leading to a high likelihood of rain in many areas. Near Shikoku, a localized front?not depicted on standard weather maps?is present, bringing developed rain clouds over the area.

Meanwhile, Typhoon No. 27?a large and very strong storm?is moving northward over the waters east of the Ogasawara Islands. Residents of the Ogasawara Islands should remain alert for high waves accompanied by swells and be cautious of strong winds through tomorrow. Please also watch out for localized heavy rainfall.

High wave conditions will persist along the Pacific coast from Northern to Western Japan through around tomorrow, the 6th. Rough seas are expected along the coasts of the Kanto region, including Ibaraki and Chiba prefectures; please exercise caution regarding high waves, swells, and strong winds.

Today, humid air will bring widespread cloud cover to the area near Honshu, resulting in unsettled weather with a high chance of rain across Western and Eastern Japan. Even if it is not raining when you head out, it is advisable to carry an umbrella. In Shikoku, particularly in Kochi Prefecture, there is a possibility of heavy rain accompanied by thunder, so please stay alert to changing rainfall conditions.

In Northern Japan, rain is expected to gradually set in from the afternoon due to a front extending from a low-pressure system moving across the Sea of ??Japan. Hokkaido lies in the path of the low-pressure system's developed rain clouds, so rainfall may intensify late at night; please be wary of lightning strikes and sudden gusts of wind.

During the day, temperatures in most areas will be close to seasonal averages. However, it may feel somewhat chilly in places where it is raining, so it would be wise to have a jacket or similar outer layer to adjust your body temperature as needed.
In Kyushu, temperatures may rise enough to make you sweat in areas where the sun breaks through.