Sea surface temperatures near Japan continue to be higher than normal [Ocean summary (July 26 to August 1, 2026)]

2026/08/05 22:13

Sea surface temperatures in the waters around Japan continued to be higher than normal, with the sea surface temperature in the Japanese waters, East China Sea, and Sea of Okhotsk reaching a maximum of 3 C above normal, and off the southeastern coast of Hokkaido it was 4 C above normal.

Below is a summary of the ocean (July 26-August 1, 2026)



#Pressure distribution and waves
On July 26, a front extended from the Sea of Japan, passing through the Hokuriku region and the southern Tohoku region, to the east of Japan. Waves increased slightly in the central Japan Sea around the front and east of Kanto.
On the 27th and 28th, a low pressure system formed above the front and moved east of Japan to far east of Japan. On the 27th, wave height rose to around 2.5m in the eastern Kanto region.
From the 29th to the 31st, another low pressure system moved eastward east of Japan, accompanied by a front. Waves increased in areas east of Kanto, off the coast of Sanriku, and east of Japan near low pressure systems and fronts.
On August 1, a front passed through the Northeastern District of China, the Sea of Japan, and the Tohoku region, and extended to the east of Japan. Typhoon No. 13 moved northwest near Minamitorishima. Waves increased around the typhoon.



#Sea surface temperature
In the Japanese Sea Area, the area of warmer-than-normal waters in the central part of Japan decreased, but the maximum temperature was 3 C above normal.
The East China Sea was higher than normal, reaching a maximum of 3 C above normal.
The sea area near the Nansei Islands has expanded slightly higher than normal.
The temperature in the south of Japan was slightly higher than normal.
The sea areas in the east of Kanto, off the coast of Sanriku, and off the southeast coast of Hokkaido, which are much higher than normal, have shrunk. The maximum temperature was 4 C higher than normal off the southeastern coast of Hokkaido.
The waters around the Kuril Islands continued to be slightly higher than normal. The Sea of Okhotsk was higher than normal, reaching a maximum of 3 C above normal.

Large typhoon No. 15 "Champon" occurs; triple typhoon; pay attention to future trends

2026/08/05 18:16

At 3:00 p.m. today, the 5th (Wednesday), Typhoon No. 15 "Changhon" formed near Wake Island. The central pressure is 998hPa, the maximum wind speed near the center is 18m/s, and the maximum instantaneous wind speed is 25m/s. Typhoon No. 15 is expected to move northward near Wake Island until tomorrow, the 6th (Thursday), and gradually change its course to the northwest. After that, it is expected to move west-northwest across the east of Japan until the 10th (Monday), and then change its course to the north-northwest on the 10th.
There is a possibility that Japan will also be affected next week, so it is necessary to pay attention to future typhoon trends.



Typhoon No. 15 August 5th (Wednesday) 15:00
Center location Near Wake Island
Size class Large
Strength class ///
Movement North-northeast 15km/h
Central pressure 998 hPa
Maximum wind speed 18 m/s (near the center)
Maximum instantaneous wind speed 25 m/s



As of 3 p.m., there are three typhoons in the waters around Japan: Typhoon No. 13, Typhoon No. 14, and Typhoon No. 15. Typhoon No. 14 in the South China Sea will continue toward the Philippines and is unlikely to have a direct impact on Japan, but Typhoon No. 13 is expected to approach Okinawa from tomorrow, Wednesday, the 6th, and as it moves slowly, the impact is likely to be prolonged. After that, there is a possibility that it will change direction and head north.



Check the latest information and prepare early.

Weather for tomorrow 6th (Thursday) Typhoon No. 13 approaches Okinawa

2026/08/05 17:57

Typhoon No. 13 is expected to approach the Nansei Islands. It will be a rainy day in Okinawa and Amami. Winds will gradually increase and the weather will become stormy late into the evening. It looks like it will be quite hot and humid due to the humid air flowing in from the typhoon.



Hokuriku, from the Tokai region to the west, are expected to continue experiencing extreme heat. During the day, it will be as hot as body temperature, and temperatures are expected to approach 40 degrees Celsius, especially on the Sea of Japan side of western Japan. Please use a parasol and hat when going out and be as careful as possible to avoid heat stroke. On the Pacific side of Kyushu and Shikoku, it is easy to rain due to the influence of moist air from typhoons, and there is a possibility of temporary heavy rain. Please take an umbrella with you when you go out.
The weather in the Kanto region will be cloudy and cloudy, but the temperature is expected to be higher than today. The humidity is also high, so you'll feel hot and humid.
There are many places in northern Japan that receive sunlight, and in some inland areas the temperature can exceed 35 degrees Celsius. Even in Hokkaido, there are many places where the temperature exceeds 30 degrees Celsius, and the summer sky will be wide open.

The intense heat continues from Kyushu to the Tokai region, with some places reaching 40c in Kyushu

2026/08/05 12:38

Today, the 5th (Wednesday), the sun is shining brightly from Kyushu to the Tokai region, making it extremely hot. It will be sunny in many places in the afternoon, and temperatures in Kyushu such as Kumamoto are likely to reach 40 degrees Celsius. We must continue to be extremely careful about heatstroke.
On the other hand, clouds will likely spread in the Kanto region, and there will be some areas with showers. The Ogasawara Islands, Izu Islands, Amami, and Okinawa need to be on guard against high waves caused by Typhoon No. 13.



The strong sun will continue to shine from Kyushu to the Tokai region in the afternoon, making it extremely hot. Maximum temperatures are expected to be over 35 C in many areas, with temperatures exceeding body temperature reaching 38 C in Osaka and 39 C in Kumamoto, and temperatures in some places in Kyushu approaching extremely hot. As the dangerous heat continues, we must continue to be extremely careful about heat stroke when carrying out recovery work.



There will be periods of sunshine in the Kanto region, but clouds will gradually spread, and there will be places where it will rain from the evening. It's safe to have a folding umbrella when you go out. The maximum temperature will be 30c in central Tokyo, which is likely to be a midsummer day, but the breeze will make you feel cool.
On the other hand, Hokuriku and Tohoku, which ended the rainy season yesterday (Tuesday), are expected to be mostly sunny. Hokkaido will also have sunny skies and blue skies. The maximum temperature will be 34 degrees Celsius in Toyama and Niigata, making it a very hot day.

Double typhoon No. 13 heads to Okinawa and Amami over the weekend, while No. 14 stalls in the South China Sea

2026/08/05 07:38

Typhoon No. 14 occurred at 3:00 on the 5th.
Typhoon No. 14 is almost stationary in the South China Sea.
It is expected to turn into a tropical cyclone near Luzon Island on the 7th,
and the impact on Japan is expected to be small, but
please pay close attention to future forecasts.



Large and extremely strong typhoon No. 13 was located in the south of Japan at 6:00 on the
5th, and is moving westward at a speed of approximately 20 km
/hr. The atmospheric pressure at the
center is 945 hectopascals, the maximum wind speed near the
center is 45 m,
the maximum instantaneous wind speed is 60 m, and the area within a radius of 185 km from the
center is a storm with wind speeds of 25 m or more.



The typhoon is moving away from the Ogasawara Islands, but it is expected to approach the Nansei Islands with strong force in the future.It will advance toward the waters near Daito Island on the night of the 6th, and will continue toward the waters near the main island of Okinawa while slowing down. After that, the typhoon is expected to move slowly northwestward in the East China Sea until around the 9th, and the effects of the typhoon may last for a long time.


In the Ogasawara Islands, extremely strong winds will blow on the 5th, causing severe flooding. As the typhoon approaches, there will be severe drought in the Okinawa region from the 5th and in the Amami region from the 6th.Atmospheric conditions in the Okinawa and Amami regions will become extremely unstable from the 6th to the 8th, with the risk of extremely heavy rain and ferocious winds.

[Wave forecast]
Wave height expected on the 5th
Izu Islands 6 meters with swells
Ogasawara Islands 9 meters with swells
Amami region 6 meters with swells
Okinawa region 9 meters with swells

Wave height expected on the 6th
Amami region 10 meters with swells
Okinawa region 10 meters with swells
Shikoku region 6 meters with swell
Southern Kyushu 8 meters with swells

Expected wave height on the 7th
Amami region 10 meters with swells
Okinawa region 10 meters with swells
Shikoku region 6 meters with swell
Southern Kyushu 8 meters with swells

[Wind forecast]
Maximum wind speed (maximum instantaneous wind speed) expected on the 5th
Ogasawara Islands 20 meters (30 meters)
Okinawa region 20 meters (30 meters)

Maximum wind speed (maximum instantaneous wind speed) expected on the 6th
Offshore Nawa region 40 meters (60 meters)
Amami region 23 meters (35 meters)

Maximum wind speed expected on the 7th (maximum Instantaneous wind speed)
Okinawa region 40 meters (60 meters)
Amami region 30 meters (45 meters)



[Rain Forecast]
24-hour precipitation expected from 6:00 on the 6th to 6:00 on the 7th (highest)
Southern Kyushu 150 mm
Amami region 100 mm
Okinawa region 120 mm

Then, 24-hour precipitation expected from 6:00 on the 7th to 6:00 on the 8th (highest) Southern Kyushu 200 mm
Amami region 200 mm
Okinawa region 200 mm

On the 5th, the Ogasawara Islands Be extremely cautious of high waves accompanied by swells,
In the Okinawa and Amami regions, please be extremely cautious of high waves accompanied by swells and strong winds until around the 9th.
In the Okinawa region, strong winds are expected to blow from the 6th in some places,
with the risk of causing some houses to collapse.
Please move to a sturdy building before the wind gets stronger, and
take extreme precautions against strong winds, such as staying away from windows when indoors.

Please be on guard for high waves with swells in southern Kyushu and Shikoku regions from the 6th to the 9th.

Also, in the Okinawa region, from around the 7th to the 8th, please be extremely cautious of landslides, and be careful of flooding of low-lying land, rising water levels, and flooding of rivers.
Okinawa region should be on high alert for storm surge on the 7th, and southern Kyushu and Amami regions should be careful of storm surge.

Be careful of strong gusts of wind such as lightning and tornadoes.
If there are signs that a cumulonimbus cloud is approaching, please take precautions such as moving inside a building.

Severe heat - West Japan is on alert for tropical nights with "minimum temperature of 30c"

2026/08/05 05:26

The area around Japan continues to be within the area of high pressure.
This high pressure system will form a band from east of Japan to northern China through the 6th, and high temperatures are expected to continue in northern and western Japan.

Today, the 5th (Wednesday),
On the Pacific side, clouds are expected to spread easily due to the influence of humid air, but on the Sea of Japan side and western Japan, it will be sunny and sunny.





Extremely hot days are expected mainly in western Japan and the Sea of Japan side of northern and eastern Japan.
Please continue to be extremely careful about heat stroke.


Tomorrow, the 6th (Thursday), some areas on the Pacific side will be affected by the moist air of Typhoon No. 13, resulting in rain.
The Okinawa and Amami regions need to be on guard for strong winds and heavy rain until around the 9th.





High temperatures are expected to continue.
In western Japan, there will be areas where the minimum temperature on the morning of the 6th will not fall below 30c. Please take care of your health day and night.

Large and extremely strong typhoon No. 13 hits the Ogasawara Islands, threatening to approach Okinawa over the weekend

2026/08/04 15:48

Typhoon No. 13, which is large and extremely strong, is located approximately 200 km south of Chichijima as of 2:00 pm today, Tuesday, April 4, and is moving westward at a speed of approximately 20 km per hour.

#Typhoon No. 13 Tuesday 4th 14:00
===================/br Center location About 200km south of Chichijima m
Size Large
Strength Very strong
Movement West 20km/h
Central pressure 945 hPa
Maximum wind speed 45 m/s (near the center)
Maximum instantaneous wind speed 60 m/s
==================================/br
The Ogasawara Islands are in a stormy region, and a maximum instantaneous wind speed of 33.4 m/s was observed on Chichijima.
As of 15:00, a storm warning has been issued for the Ogasawara Islands.
The typhoon will be closest to the Ogasawara Islands by the evening of today, the 4th, and is expected to continue moving west through the waters near the Ogasawara Islands, maintaining its extremely strong strength until tomorrow, the 5th (Wednesday). In the Ogasawara Islands, there is a risk of strong rain and wind leading to rough weather tomorrow, so vigilance is required.



#Expected wave height (with swells)
+Wave height expected for today, 4th
Northern Izu Islands 5m
Southern Izu Islands 6m
Ogasawara Islands 11m
+Expected for tomorrow 5th (Wednesday) Wave height
Northern Izu Islands 5m
Southern Izu Islands 6m
Ogasawara Islands 9m

#Expected wind strength
+Maximum wind speed (maximum instantaneous wind speed) expected today on the 4th
Ogasawara Islands 30m/s ( 45m/s)
+Maximum wind speed (maximum instantaneous wind speed) expected on tomorrow 5th (Wednesday)
Ogasawara Islands 23m/s (35m/s)

#Expected amount of rain (in areas with the most)
+1-hour precipitation expected today on 4th
Ogasa Hara Islands 30mm
+24-hour precipitation expected by 6:00 a.m. on Wednesday the 5th tomorrow
Ogasawara Islands 150mm
+24-hour precipitation expected by 6:00 a.m. tomorrow 6th (Thursday)
Ogasawara Islands 60mm



The typhoon is expected to move south of Japan on the 5th tomorrow. After that, it is expected to approach the Okinawa region with a "strong" force from the 6th to the 9th. Winds are expected to start to pick up in Okinawa from tomorrow the 5th, and in the Daitojima region from the 6th to the 7th, and in the Okinawa main island region from the 7th to the 9th, with fierce winds that could cause some houses to collapse. You should move to a sturdy building before the winds get stronger, and take strict precautions against the storm by staying away from windows indoors. Please take early typhoon measures before the winds get stronger.

The typhoon is expected to move at a slower speed when it approaches Okinawa on the 8th or 9th, as its path will be blocked by high pressure. As a result, there is a risk of long-lasting stormy winds in the main island of Okinawa. Additionally, depending on the path of the typhoon, there is a risk of strong winds in the Miyakojima region around the 8th.
The main island of Okinawa and the Daitojima region are expected to be hit hard from tomorrow, the 5th (Wednesday), with some places expected to be hit hard. The Sakishima Islands are also expected to experience heavy rain around the 8th. Please be extremely cautious of high waves accompanied by swells.
Depending on the path of the typhoon, there is a risk of warning-level heavy rain in the Daitojima region on the 6th, and in the Okinawa main island region from the 7th to the 8th.
In the main island of Okinawa, depending on the path of the typhoon, there is a risk of warning level storm surge from the 6th to the 9th.
In the Okinawa region, be careful of lightning strikes, gusts of wind, and sudden heavy rain under developed cumulonimbus clouds.



#Expected wind strength
+Wind direction/maximum wind speed (maximum instantaneous wind speed) expected for tomorrow 5th (Wednesday)
Daitojima region northwest 20m/ s (30m/s)
+Wind direction and maximum wind speed (maximum instantaneous wind speed) expected for the 6th tomorrow (Thursday)
Daitojima region south 40m/s (60m/s)
Okinawa main island region northwest 23m/s (35m/s)
Miyakojima region northwest 15m/s (25m/s)

#Expected wave height (With swells)
+Expected wave height on today 4th
Okinawa main island region 3m/s
Daitojima region 4m/s
Miyakojima region 2.5m/s
+Wave height expected for tomorrow 5th (Wednesday)
Okinawa main island region 6m/s
Daitojima region 9 m/s
Miyakojima region 3m/s
Yaeyama region 2.5m/s
+Estimated wave height on the 6th
Okinawa main island region 9m/s
Daitojima region 10m/s
Miyakojima region 5m/s
Yaeyama region 4m/s

#Forecast Amount of rainfall expected (in areas where there is a lot)
+24-hour precipitation expected by 12:00 on the 7th
Okinawa main island region 80mm
Daitojima region 200mm

The rainy season ended late in Hokuriku and Tohoku. Both in normal years and last year, the rainy season ended late.

2026/08/04 11:49

Today, the 4th, the Japan Meteorological Agency announced that the rainy season appears to have ended in Hokuriku, southern Tohoku, and northern Tohoku. The rainy season ended later than both normal and last year, with the rainy season lasting 46 days in southern Tohoku and Hokuriku and 45 days in northern Tohoku. (Breaking news)



+Hokuriku: 12 days later than normal, 36 days later than last year
+Southern Tohoku: 11 days later than normal, 17 days later than last year
+Northern Tohoku: 7 days later than normal, 17 days later than last year




Today, the 4th is covered by the Sea of Okhotsk high pressure system, and many places in Hokuriku and northern Japan are sunny. From now on, it will likely be covered by high pressure, and temperatures will rise mainly on the Sea of Japan side. In Kanazawa, Niigata, and Akita, there are days when the maximum temperature exceeds 35c, making it extremely hot, so please be careful not to get heat stroke.
On the Pacific side of Tohoku, there will be many cloudy days due to the influence of humid air. As a result, the rise in temperature will be slow, and it looks like it will be a relatively pleasant week.

Today's weather on the 4th (Tuesday): Extreme heat in western Japan, moderate heat in Kanto

2026/08/04 07:15

Typhoon No. 13 is expected to remain large and extremely powerful as it approaches the Ogasawara Islands. Winds are already increasing in the Ogasawara Islands, so please be careful of strong winds, heavy rain, and high waves. On the other hand, the area around Honshu will be covered by high pressure, but clouds will likely spread over the Pacific side of eastern and western Japan due to the influence of moist air.



From the East Sea to the west, the heat will be as intense as body temperature. Please continue to be as careful as possible to avoid heat stroke. Rain is expected on the Pacific side of Kyushu and Shikoku due to Typhoon No. 13.
The Kanto region is affected by humid easterly winds, and there are many places where the temperature does not reach 30c even during the day. The weather tends to be more cloudy on the Pacific side, so it's a good idea to bring a folding umbrella with you when you go out.
It seems like there will be more places in northern Japan and Hokuriku where the sunlight will reach. There will be periods of cloudy weather on the Pacific side, but there won't be any major changes in the weather. It will be cool on the Pacific Ocean side, and crisply hot on the Sea of Japan side.

[Typhoon information] Large and extremely strong typhoon No. 13 will make its closest approach to the Ogasawara Islands on tomorrow 4th

2026/08/03 18:23

As of 3:00 p.m. today, Monday, March 3,
large and extremely strong typhoon No. 13 is located near Ogasawara and is moving west-northwest with a stormy area at a speed of approximately 25 kilometers per hour.
The central pressure is 945hPa and the maximum wind speed near the center is 45m/s
The maximum instantaneous wind speed is 60m/s.



Typhoon No. 13 is expected to approach the Ogasawara Islands with extremely strong force accompanied by stormy winds from
4th (Tuesday) to 5th (Wednesday).

In the Ogasawara Islands, heavy rain accompanied by thunder is expected to occur in some places from the morning of the 4th until the early evening of the 4th.

In addition, extremely strong winds will blow from late tonight until the 5th, and from midday to early afternoon on the 4th, there will be strong winds in some areas that could cause injuries from flying objects or overturn trucks.

Maximum wind speed expected on the 3rd (maximum instantaneous wind speed)
Ogasawara Islands 20 meters (30 meters)
Maximum wind speed expected on the 4th (maximum instantaneous wind speed)
Ogasawara Islands 30 meters (45 meters)
Maximum wind speed (maximum instantaneous wind speed) expected on the 5th
Ogasawara Islands 23 meters (35 meters)



Please refrain from going out unless necessary, and stay away from windows when indoors to avoid strong winds.

Please pay attention to the latest information that will be announced in the future.