Today, the 18th (Thursday), rain due to frontal stagnation on the Pacific side in the morning, atmospheric instability inland in the afternoon

2026/06/18 04:54

There is a high pressure system east of Kanto and it is moving east. Meanwhile, a low pressure system near the Korean Peninsula is moving eastward. The rainy season front extends from the Izu Islands through the south of Kyushu and toward southern China.

There are places on the Pacific side of the Kanto and Kinki regions, as well as southern Kyushu, where it is raining. A level 4 landslide warning has been issued for Toshima Village in the Amami region of Kagoshima Prefecture.

# Morning: Rain mainly on the Pacific side
In the morning, due to the influence of the rainy season front, rain is expected in the Kanto and Tokai Pacific sides, Kyushu and Okinawa regions.
There is a risk of extremely heavy rain accompanied by thunder, especially in southern Kyushu and Okinawa. The ground has become loose in some areas due to the rain up until yesterday, so it is necessary to be on guard against landslides even with a small amount of rain.



# Afternoon: Sudden thunderstorms in inland areas
Although the rain is expected to stop in many places around noon, the atmospheric conditions will become unstable mainly in inland areas from Hokuriku to Kanto. There is a risk of localized heavy rain accompanied by thunder, so please be careful of sudden changes in the weather.



# Tips for going out
Even if it's not raining in the morning, it's a good idea to carry a foldable umbrella. There is a possibility of heavy rain in the afternoon.

Waves are rising due to fronts and low pressure; sea surface temperatures continue to be higher than normal in the central and western Japan Sea [Ocean summary (June 7th to 13th, 2026)]

2026/06/17 19:50

The front stalled from near the Nansei Islands to the south of Japan, and waves rose around the front and around the low pressure area above the front, and there were places from the Nansei Islands to the south of Japan. To the east of Hokkaido, the storm was affected by a low-pressure system moving near the Kuril Islands.
Sea surface temperatures in the Japanese waters continued to be significantly higher than normal on the continental side in the central and western regions, reaching up to 3c higher than normal.

Below is the ocean summary (June 7th to 13th, 2026).



#Pressure distribution and waves
On the 7th, there was a large pressure gradient between the low pressure far east of Japan and the high pressure over the Sea of Okhotsk, and waves rose on the Pacific side of northern and eastern Japan. A low pressure front moved eastward south of Kyushu and settled near the Nansei Islands.
On the 8th, a low pressure system moved eastward near the Izu Islands and settled in the south of Japan.
From the 9th to the 11th, a low pressure system moved from near Hokkaido to the east of the Kuril Islands. A front extended from the Nansei Islands to the east of Japan. Waves were increasing in the east of Hokkaido around the low pressure system and south of Okinawa and east of Japan near the front, and on the 10th, waves were strong in the east of Hokkaido and south of Japan.
On the 12th and 13th, a frontal low pressure system moved eastward east of Japan. In the east of Japan, waves increased around the low pressure area.



#Sea surface temperature
Sea surface temperatures in the northern part of the Japanese Sea remained at normal levels, but in the central and western continental areas, waters remained significantly higher than normal.
The East China Sea continued to be at normal levels, and the waters near the Nansei Islands continued to be below normal.
Off the coasts of Shikoku and the Tokai Sea, conditions were near normal.
Off the southeast coast of the Kanto region, sea areas continued to be slightly lower than normal.
The sea area from the east of Kanto to the coast of Sanriku continued to be lower than normal, with temperatures as low as 4c.
Off the southeastern coast of Hokkaido, sea conditions continued to be lower than normal, and the waters near the Chishima Islands and the Sea of Okhotsk were at normal levels.

Weather for the week: The rainy season front is gradually moving north, and the humid rainy days are likely to continue around Honshu.

2026/06/17 18:13

From now on, the rainy season front will gradually move north toward Honshu. It looks like the rainy season will end in Okinawa, and the rainy season will begin in Hokuriku and Tohoku.

Tomorrow, the 18th (Thursday), heavy rain with thunder is expected in some places in the southern Kyushu and Amami regions, where the rainy season front is stationary, starting in the morning. As the ground has become loose in some areas due to heavy rain, even a little rain can cause landslides, so please be careful. Also, please be careful of flooding in low-lying areas and rising water levels in rivers.



It will rain around Honshu, mainly on the Pacific side from western Japan to eastern Japan. The rain is expected to stop in many places around noon, but atmospheric conditions will become unstable in the afternoon due to cold air, a trough in the atmospheric pressure in the upper atmosphere, and moist air.
Thunder clouds are expected to develop from evening to early night, mainly in the inland areas and mountains of western and eastern Japan, so please be careful of sudden thunderstorms, lightning strikes, and strong gusts of wind such as tornadoes.



From Friday the 19th onward, high pressure is expected to extend south of Honshu, and the rainy season front is expected to extend east-west around Honshu on many days. Okinawa is expected to have more sunny days in the future, and the Japan Meteorological Agency may announce the end of the rainy season.

On the other hand, there are many cloudy and rainy days around Honshu, and it will be the rainy season. In the Hokuriku and Tohoku regions, where the rainy season has not yet been announced, the Japan Meteorological Agency may announce the start of the rainy season.
On the weekend around the 20th (Saturday), there is a possibility of heavy rain mainly in Kyushu due to the influence of a low pressure system moving from the west, so please pay attention to the latest weather information that will be updated in the future. In western Japan, there are places where the temperature rises to nearly 30 degrees Celsius even on rainy days, making it a humid experience. To avoid heatstroke, be sure to drink plenty of water and take adequate breaks.

Weather for tomorrow 18th (Thursday): Rainy on the Pacific side

2026/06/17 17:37

A low-pressure system on top of the seasonal rain front is expected to move northeast along the southern coast of Honshu.




Due to the influence of the rainy season front, it will be easier to rain on the Pacific side from Kyushu to Kanto. There is a risk of locally heavy rain, especially in southern Kyushu, which is close to the rainy season front. The rain in the Kanto region stops early in the morning, but clouds continue to spread and the weather becomes gloomy. In Hokuriku, there is a possibility of showers from evening to night as a pressure trough approaches. If you will be returning home late, it is a good idea to bring an umbrella just in case.
The temperature will rise to around 30c during the day in a wide area, making it humid and uncomfortable. It is a good idea to choose clothes that are breathable.

Heavy rain in southern Kyushu due to the influence of the seasonal rain front; strict warning for landslides; late tonight, the area of rain will spread to the east

2026/06/17 13:01

Today, the 17th (Wednesday), the rainy season front is stationary near southern Kyushu. Warm, humid air is flowing towards the rainy season front, and heavy rain of more than 30mm per hour is falling in some places, especially around Tanegashima and Yakushima in Kagoshima Prefecture.
As of noon, a level 3 landslide warning has been issued in Nishinoomote City, Kagoshima Prefecture, and a level 4 landslide warning has been issued in Toshima Village, Amami Region.

In southern Kyushu, the rainy season front will continue to remain stationary, and there will be heavy rain with thunder in some places, mainly in the Amami region, from the afternoon onwards. The rainy season front is expected to remain near the Tanegashima and Yakushima regions until the 18th, and heavy rain is likely to continue. The ground has become loose in some places due to heavy rain, so please be extremely careful about landslides.
Also, be careful and be wary of flooding in low-lying areas, rising water levels, and flooding of rivers.



The rainy season front is expected to gradually move north toward Honshu tonight. In the Shikoku region, the Kii Peninsula, and the Tokai region, it will start raining in the evening, accompanied by localized thunderstorms. Rain will start to fall in some places along the coast of the Kanto region late tonight, and the area of rain will spread into tomorrow, the 18th (Thursday).
Especially in the areas where strong shaking was observed in the Kanto region yesterday, the 16th (Tuesday), there is a high risk of landslides and falling rocks even with a little rain, so please be careful.

Weather for tomorrow, the 17th (Wednesday): Front moving north, clouds spreading on the Pacific side

2026/06/16 18:13

Tomorrow, northern and eastern Japan will be in an area of high pressure, and many places north of the Kanto region will receive sunlight. The seasonal rain front is moving northward, and clouds are likely to spread more easily on the Pacific side.




Due to the influence of the rainy season front, Okinawa, Amami, and southern Kyushu are prone to active rain clouds, and there is a risk of locally heavy rain. It rains easily in Shikoku, Kinki, and the Pacific side of the Tokai region, so please bring an umbrella when you go out. There are a lot of clouds on the Sea of Japan side of western Japan, but it doesn't seem like umbrellas will be useful.
In the Kanto region, the rainy season continues to be sunny, but in coastal areas there is a possibility that it will start raining around the time the date changes. In Tohoku, midsummer days are expected to continue, especially in inland areas. Please be careful of heat stroke.

In the Kanto region, the rainy season will be closed until around the 17th tomorrow, and the rainy season will return from the second half of this week.

2026/06/16 12:56

The Kanto region will be gently covered by high pressure today, the 16th (Tuesday) and tomorrow the 17th (Wednesday), and many places will see sunshine. From the 18th (Thursday) later this week, the front will move north, the rainy season will return, and the sky will remain sluggish.



Today, the 16th (Tuesday) and tomorrow the 17th (Wednesday), the Kanto region is expected to be gently covered by high pressure. Moist air will move in from the south and clouds are expected to spread, but there will also be time for sunshine.

The rainy season front is expected to gradually move northward and become stationary near Honshu from around the 18th (Thursday) later this week. The Kanto region will continue to experience sluggish weather with rain and cloudy weather.

It looks like tomorrow will be your chance to dry your laundry and futons outside.
Also, it looks like the rain will continue this weekend after the 20th (Saturday). There is a possibility that the rainy season front will become more active, so it is a good idea to prepare for heavy rain disasters now.
Please note that the pattern of rain will change depending on the position of the front where it stagnates and the degree of development of the low pressure above the front, so be sure to check the latest weather forecast.



Temperatures are expected to reach 30c or higher in some places on sunny days and around Friday the 19th. It's likely to be hot and humid, so don't forget to take precautions against heat stroke, such as taking frequent breaks and hydrating.
In addition, the temperature will drop on rainy days in the future, and it is likely that there will be days when it will be around 23c, which is lower than average.
Please dress appropriately and be careful not to get sick due to the daily temperature changes.

Level 4 Landslide Danger Warning Announced in Okinawa Today, the 16th, Strict Alert for Landslides

2026/06/16 06:43

A low pressure system is moving northeast to the east of Japan, and a front extending from the low pressure system is over the Nansei Islands.
Warm and humid air is flowing towards the front, and rain clouds are forming near the front.

The rain has so far exceeded 200mm in 12 hours in some places in Okinawa Prefecture, and a level 4 landslide warning has been announced for the central and southern parts of the main island of Okinawa Prefecture.

Today, the 16th, the Baiu front will move slightly northward, but due to the influence of moist air flowing into the Baiu front, the atmospheric conditions are expected to remain unstable until today, the 16th.



In the Okinawa main island region and Miyakojima region, heavy rain is expected to occur in some places today, the 16th. Please be extremely cautious of landslides today, the 16th, and pay close attention to flooding of low-lying land and rising water levels in rivers. Depending on the degree of rain cloud development, there is a risk that Level 4 danger warnings and Level 3 warnings will be issued in more areas of the main island of Okinawa. In the Miyakojima region, there is a risk of warning-level heavy rain depending on the degree of rain cloud development, so please be careful of landslides and flooding of low-lying areas.
In the Okinawa main island region and Miyakojima region, please be careful of strong gusts such as lightning and tornadoes through tomorrow the 17th. If there are signs that a cumulonimbus cloud is approaching, please take precautions such as moving inside a building. The Yaeyama region and Daitojima region also need to be careful of lightning and gusty winds under the developed cumulonimbus clouds today, the 16th.


[Rain live report]
Precipitation amount from the start of rain (00:00 on the 9th) to 04:00 today on the 16th (according to AMeDAS) (Preliminary figures)
Okinawa Prefecture
Hikawa, Naha City 382.5 mm
Nanjo City Itokazu 378. 0mm
Naha Airport 369.0mm
Tokashiki Village Tokashiki Island 343.5mm
Offshore Nawaichi Goya 322.5mm
Shimojishima Airport 236.0mm
Shimosato, Miyakojima City 17 7.0 mm
Miyakojima City Shinjo 160.0 mm
Miyako Airport 155.5 mm
Tarama Airport 135.0 mm

[Rain Forecast]
#Expected amount of rain (in places with a lot of rain)
+kyo Precipitation expected for 1 hour on the 16th
Okinawa Main Island region 40mm
Miyakojima region 30mm
+24-hour precipitation expected by 6 o'clock on the 17th tomorrow
Okinawa Mainland region 100mm
Miyakojima region 60mm

The weather for today, the 16th (Tuesday): It will be sunny in many places from northern Japan to eastern Japan. Heavy rain is expected in the Nansei Islands.

2026/06/16 06:27

Today, the 16th (Tuesday), there will be a high pressure system centered over the Sea of Japan, and many places from northern Japan to eastern Japan will be sunny. Meanwhile, the seasonal rain front is expected to move northward over the Nansei Islands.



In northern and eastern Japan, there are many places where it is sunny during the day. In Hokkaido, there are places in eastern Hokkaido where there are showers due to the cold air in the sky. It's safe to have a folding umbrella when you go out.

It is expected to be sunny and warm from Tohoku to eastern Japan. Temperatures in the Kanto region are expected to rise from the previous day, reaching around 30c. There will be a big difference in temperature from the previous day, so please take care of your health. Please be careful of heatstroke when participating in outdoor activities.

Western Japan will receive sunlight on the Sea of Japan side. On the other hand, clouds will tend to spread over the Pacific Ocean, and there will be some places in the Kinki and Shikoku regions where there will be showers starting in the evening. Southern Kyushu is also likely to experience rainy weather.

The Nansei Islands are prone to active rain clouds associated with the seasonal rain front, and there is a risk of heavy rain and thunderstorms. Please be extremely cautious of landslides, and be careful of flooding of low-lying land and rising water levels in rivers.

Last minute prediction of a linear rain band in the main island of Okinawa. Be on guard for a linear rain band until tonight!

2026/06/15 18:45

In the Okinawa main island region, please be extremely cautious of landslides, flooding of low-lying areas, and rising and flooding rivers. In the northern part of the main island, there is a high possibility that a linear precipitation band will develop over the next three hours, causing very heavy rain to continue in the same area. The risk of a life-threatening disaster may increase rapidly.



Atmospheric conditions in the main island of Okinawa are extremely unstable due to the rainy season front and moist air flowing into the front. This situation is expected to continue until the 16th.

[Rain Forecast]
The predicted hourly precipitation on the 15th is high in places,
South-Central Main Island 50 mm
Northern Main Island 50 mm
Kumejima 50 mm
The high rainfall expected in 1 hour on the 16th is
South-Central Main Island 40 mm
Northern Main Island 40 mm
Kumejima 40 mm
The expected 24-hour precipitation from 18:00 on the 15th to 18:00 on the 16th is expected to be high in the central and southern parts of the main island, 150 mm
in the northern part of the main island, and 150 mm
in Kumejima. If a linear precipitation band develops, there is a risk of locally increased rainfall.

In the Okinawa main island region, extremely heavy rain is expected to occur in some places on the 15th. In the northern part of the main island, there is a high possibility that a linear precipitation band will develop over the next three hours, causing very heavy rain to continue in the same area. The risk of a life-threatening disaster may increase rapidly. Please be extremely cautious of landslides, flooding of low-lying areas, and rising and flooding rivers.

Level 4 landslide warnings and level 3 heavy rain warnings have been announced for a wide area in the central and southern parts of the main island. In the central and southern parts of the main island, please be on high alert for landslides through the 15th, and be on guard against flooding of low-lying land, rising water levels and flooding of rivers.
Please note that depending on the degree of rain cloud development, there is a risk that Level 4 danger warnings and Level 3 warnings will be issued for more areas in the main island of Okinawa on the 15th.

In the Okinawa main island region, please be careful of strong gusts such as lightning and tornadoes through the 16th. If there are signs that a developed cumulonimbus cloud is approaching, please take precautions such as moving inside a building. ,