Warning-level heavy rain expected over the weekend; be careful of wind and waves

2026/04/03 18:35

On the 4th (Saturday), a low pressure system accompanied by a front is expected to develop and move eastward across the Sea of Japan.
Atmospheric conditions are expected to be extremely unstable as warm, humid air flows in from the south toward the front and low pressure system. Heavy or very heavy rain with thunder is possible.
The rain is expected to intensify in western Japan from the morning and in eastern Japan from the afternoon onwards, resulting in locally heavy rain.
Particularly in the southern Kinki region, extremely heavy rain will fall locally from the evening of the 4th to the early evening of the 4th. If the rain clouds develop more than expected or become stagnant, there is a possibility of warning-level heavy rain.



[Wave forecast]
Wave height expected on the 4th (Saturday)
Chubu Kinki 4 meters
Southern Kinki 5 meters
Tsushima Strait 5 meters
9 West Sea Sea 5 meters
Bungo Channel 5 meters
Seto Inland Sea 3 meters
br Expected wave height on the 5th
Southern Kinki 5 meters with swells

[Wind forecast]
Maximum wind speed (maximum instantaneous wind speed) expected on the 4th (Saturday)
Kinki-Chubu Onshore 17 meters (30 meters)
Kinki-Chubu Offshore 20 meters ( 30 meters)
Kinki Southern Land 15 meters (30 meters)
Kinki South Sea 20 meters (30 meters)
Tsushima Strait 20 meters (30 meters) 23 meters (35 meters)
Bungo Channel 23 meters (35 meters)
Seto Inland Sea 20 meters (30 meters)
Ariake Sea 18 meters (30 meters)
18 meters on land in northern Kyushu Tor (30 meters)

The wind will be strong even on land, so please be careful.
A wind speed of 15 meters is so strong that it becomes impossible to walk into the wind, and some people fall due to the wind.



Please check the latest information in the future.

Tomorrow, the 4th, the weather will be rough nationwide. Be careful of stronger wind and rain mainly in western Japan and the Pacific side.

2026/04/03 13:14

Tomorrow, the 4th (Saturday), a low pressure system accompanied by a front is expected to develop and move east-northeast from the East China Sea, through the Tsushima Strait, and into the Sea of Japan.
As a result of this, the weather is expected to deteriorate from the west, bringing strong rain and wind across the country. There is a risk of warning-level heavy rain and strong winds, especially in western Japan and the Pacific side of eastern Japan.



It will start raining tonight in the Kyushu region. Rain will gradually spread to the Chugoku and Shikoku regions by the morning of the 4th (Saturday), the Kinki and Tokai regions around noon, and from the Kanto region to northern Japan in the afternoon. Another low-pressure system is expected to approach Hokkaido from Primorye, and there will be some places where it will rain.

Low pressure and southerly winds blowing toward the front are expected to bring in warm, humid air, and rain clouds will develop mainly from the Pacific side of western to eastern Japan, with heavy rain showers expected in some places. Heavy rain is expected to occur in some places, accompanied by thunder.

Atmospheric conditions are expected to be extremely unstable, especially in southern Kyushu and the Amami region. Localized cumulonimbus clouds will develop in southern Kyushu from the morning of the 4th to the evening of the 4th, and in the Amami region from the morning of the 4th to late at night, leading to the risk of thunderstorms, tornadoes, and other violent gusts.
If there are signs of a developing cumulonimbus cloud approaching, please take every precaution to ensure your safety, such as moving inside a building.



Also, as the low pressure passes, the pressure gradient will increase, so the winds will become stronger. It is expected to be a torrential rain. Please be careful when going out.

In the coastal waters of northern Kyushu, please be on guard for strong winds and high waves on the 4th, and be careful of high tides.
In the central Kinki region, please be wary of high waves from late afternoon to early evening on the 4th. In the Kinki region, please be careful of strong winds from the morning of the 4th until the evening.
Please check the latest information as transportation may be affected.

Cherry blossoms have already been seen blooming and in full bloom in various places, but tomorrow, the 4th (Saturday), is likely to be a spring storm and the weather will be unfortunate.

Today's weather on the 3rd (Friday): Widespread clear skies with sunshine, large temperature difference throughout the day

2026/04/03 06:15

Today, the 3rd (Friday), the area around Japan will be covered in high pressure, so it is expected to be sunny and sunny across the country. It will be colder in the morning, but many places will be warm during the day, and the temperature difference throughout the day is likely to increase.



On the Japan Sea side of Hokkaido and Tohoku, clouds tend to spread at first, and there will be showers mainly in the morning on the Japan Sea side of Tohoku. It's safe to have a folding umbrella when you go out. In the afternoon, it will gradually clear up in many places and it will be a pleasant experience.

Sunshine will reach a wide area from eastern to western Japan in the morning. Temperatures are expected to rise during the day, reaching around 20 degrees Celsius in many places. In addition, there will be places like Fukuoka and Matsue where it will be as warm as early May.
It gets colder in the morning due to radiation cooling, so the temperature difference throughout the day increases. Please be careful not to get sick by adjusting your clothes.

As it starts to rain in Kyushu, Chugoku, and Shikoku at night, please prepare rain gear such as a folding umbrella if you will be returning home late.

One month forecast: High temperature trend continues nationwide; heavy precipitation expected on the Pacific side of eastern Japan and western Japan

2026/04/02 21:20

Today, the 2nd (Thursday), the Japan Meteorological Agency announced the one-month forecast for April 4th to May 3rd.

The Pacific side of eastern Japan and western Japan will be susceptible to the effects of low pressure systems and fronts around the beginning of the period, and will experience more precipitation than normal. Okinawa and Amami are expected to be easily covered by high pressure because the gradient of atmospheric pressure is gentle.
The temperature at an altitude of approximately 1,500 meters is expected to be higher than normal nationwide, as westerly winds tend to flow further north than normal, making it more likely to be covered by warm air.



As a result, temperatures will remain high across the country over the next month.
From this weekend until the beginning of next week, many places will have higher than average temperatures, and the weather is expected to be as warm as May, especially in northern and eastern Japan. Even in central Tokyo, the highest temperature is expected to be 25 degrees Celsius on the 6th (Monday), making it the first summer day of the year. Widespread rain is expected over the weekend, but those planning to exercise indoors should take precautions against the heat.
The trend of high temperatures is expected to continue into the second half of Golden Week, with many days being warmer than normal, and it may be necessary to take measures against the heat during the Golden Week holidays.
Please be careful about your daily physical condition as the risk of heat stroke may increase when you are not yet used to the heat.
On the other hand, the cherry blossom front is moving smoothly into northern Japan, and even in northern Japan, many places are expected to bloom earlier than normal. It's a good idea to make your cherry blossom viewing plans early.

Due to the effects of low pressure and fronts, precipitation over the next month is expected to be higher than normal on the Pacific side of eastern Japan and western Japan, and at or above normal on the Sea of Japan side of eastern Japan.
The Pacific side of eastern Japan and western Japan have been less affected by low pressure and fronts since mid-November last year, so precipitation has been low. With heavy rainfall expected over the next month, the impact will be somewhat resolved, but it is possible that the effects of the low rainfall to date may remain.
In northern Japan, there are days when the weather is not clear during the first half of the period, but there are many sunny days in the second half.