See exactly when rain will start and stop with a minute-by-minute precipitation nowcast for the next hour.
Compare today's weather with yesterday's data and track temperature trends over time.
Hourly Forecast
Daylight Hours
06:12
Sunrise
18:11
Sunset
Moon
Waxing Gibbous
15:15
Moonrise
01:23
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 Isahaya.
UV Index
Humidity
Current stargazing conditions?
See sky darkness, moon phase, and the best viewing window for Isahaya.
View stargazing scoreWeather in Isahaya today, September 21, 2026
Isahaya keeps a mostly sunny profile on September 21, 2026, aside from a cloudier spell around 05:00. Outside that window, bright conditions should still lead the day. The opening hours look fair, as cloud stays near 36% around 05:00. Morning errands should face fewer weather interruptions.
The day peaks near 27°C and cools toward 22°C. Moisture in the air spans 53%-82%, with the highest values around 05:00. A lighter breeze peaks around 18:00 near 6.0 km/h.
Later hours favour clearer intervals, as cloud stays near 33% around 15:00. The afternoon is the better half for outdoor time. Expect visibility around 16.1 km. Sunrise is at 06:12 and sunset at 18:11, giving 11 hours 58 minutes of sunlight today.
Overall, Isahaya on September 21, 2026 favours outdoor plans under mostly open skies, with a comfortable high near 27°C.
Frequently asked questions about weather in Isahaya
How warm does it get in Isahaya?
The warmest month in Isahaya is August, with average high temperatures of 30°C. The average temperature during this period is around 28°C.
How cold does it get in Isahaya?
The coldest month in Isahaya is January, with average low temperatures of 7°C. The average temperature during this period is around 8°C.
What is the wettest time of year in Isahaya?
The wettest month in Isahaya is June, with an average of 400mm of precipitation.
What is the driest time of year in Isahaya?
The driest month in Isahaya is January, with an average of 80mm of precipitation.
Explore more weather forecasts
- Ōmura, Nagasaki Prefecture
- Tokyo, Tokyo Prefecture
- Obita, Nagasaki Prefecture
- Yokohama, Kanagawa
- Nagasaki, Nagasaki Prefecture
- Osaka, Ōsaka-fu
- Togitsu, Nagasaki Prefecture
- Nagoya, Aichi-ken
- Unzen, Nagasaki Prefecture
- Sapporo, Hokkaido
- Minamishimabara, Nagasaki Prefecture
- Fukuoka, Fukuoka Prefecture
- Kawatana, Nagasaki Prefecture
- Kawasaki, Kanagawa
- Shimabara, Nagasaki Prefecture
- Kobe, Hyōgo
