See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
23°
Overcast
Feels Like: 23°
Min: 23°
Max: 27°
The next few hours will be overcast, with today reaching 27°C and dropping to 21°C. The coming days will be rain throughout the day.
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
05:49
Sunrise
17:47
Sunset
Moon
Waxing Gibbous
14:57
Moonrise
00:52
Moonset
Daily Forecast
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Air Quality Data Available
Upgrade to access real-time air quality data for Kusatsu.
Resources
UV Index
Humidity
Current stargazing conditions?
See sky darkness, moon phase, and the best viewing window for Kusatsu.
View stargazing scoreWeather in Kusatsu today, September 21, 2026
Expect unsettled, showery conditions in Kusatsu on September 21, 2026 as rain moves through. The day opens on a wet note and needs flexible outdoor plans. Morning plans should assume damp conditions, as rain chances climb toward 68% around 04:00. Cloud cover is also at its densest near 04:00 at roughly 100%.
The temperature range runs from about 23°C up to 27°C. Relative humidity sits between 75% and 91%, reaching its peak around 04:00. Airflow remains manageable, reaching about 4.7 km/h around 09:00.
Afternoon conditions improve on the morning wet spell, as rain chances fall toward 12% from about 68% earlier. Cloud still reaches roughly 100% near 12:00. Horizontal visibility holds close to 16.1 km. The sun rises at 05:49 and sets at 17:47, for a total of 11 hours 58 minutes of sunlight today.
Overall, Kusatsu on September 21, 2026 suits indoor plans or waterproof kit, especially while rain chances stay near 68% and the high sits around 27°C.
Frequently asked questions about weather in Kusatsu
How warm does it get in Kusatsu?
The warmest month in Kusatsu is August, with average high temperatures of 33°C. The average temperature during this period is around 28°C.
How cold does it get in Kusatsu?
The coldest month in Kusatsu is January, with average low temperatures of 1°C. The average temperature during this period is around 4°C.
What is the wettest time of year in Kusatsu?
The wettest month in Kusatsu is June, with an average of 201mm of precipitation.
What is the driest time of year in Kusatsu?
The driest month in Kusatsu is December, with an average of 52mm of precipitation.
