See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
23°
Mostly Clear
Feels Like: 23°
Min: 23°
Max: 27°
The next few hours will be mostly clear, with today reaching 27°C and dropping to 21°C. The coming days will be light rain throughout the day.
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
06:11
Sunrise
18:10
Sunset
Moon
Waxing Gibbous
15:11
Moonrise
01:24
Moonset
Daily Forecast
Monday
Tuesday
Wednesday
Thursday
Friday
Saturday
Sunday
Monday
Tuesday
Wednesday
Air Quality Data Available
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UV Index
Humidity
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View stargazing scoreWeather in Sendai today, September 21, 2026
Sunshine leads the day in Sendai on September 21, 2026, with a patch of cloud building near 15:00. The broader outlook stays fair despite that temporary thickening. Morning skies stay relatively clear, holding cloud close to 29% near 11:00. The early part of the day favours being outside.
Expect highs of 27°C and cooler readings close to 23°C. Moisture in the air spans 57%-81%, with the highest values around 06:00. Expect gentle winds, highest near 09:00 at 6.7 km/h.
Expect a more open afternoon, with limited cloud around 35% by 15:00. Residual damp risk should be lower than earlier. Views remain open at about 16.1 km. The sun rises at 06:11 and sets at 18:10, for a total of 11 hours 58 minutes of sunlight today.
Overall, Sendai on September 21, 2026 favours outdoor plans under mostly open skies, with a comfortable high near 27°C.
Frequently asked questions about weather in Sendai
How warm does it get in Sendai?
The warmest month in Sendai is August, with average high temperatures of 30°C. The average temperature during this period is around 29°C.
How cold does it get in Sendai?
The coldest month in Sendai is January, with average low temperatures of 8°C. The average temperature during this period is around 10°C.
What is the wettest time of year in Sendai?
The wettest month in Sendai is June, with an average of 447mm of precipitation.
What is the driest time of year in Sendai?
The driest month in Sendai is December, with an average of 87mm of precipitation.
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