Sasebo Weather in September
What's the weather like in Sasebo (Nagasaki) in September 2025?
The climate in Sasebo during September can be summarized as hot, humid and wet.
September is in the fall / autumn in Sasebo and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a muggy 28°C (82°F), whilst at night 20°C (69°F) is normal.
| Daytime temperature | 27.6°C 81.6°F |
|---|---|
| Nightly temperature | 20.3°C 68.5°F |
| Average temperature | 23.9°C 75°F |
| Daily sunshine | 6 hrs |
| Avg rainfall | 195 mm 7.7 ins |
| Rainy days | 16 days |
| Sea temperature | 26.2°C 79.2°F |
| Humidity | 76% |
| Windspeed | 8.3kph 5 mph |
On average September is the 4th wettest month of the year in Sasebo with around 195mm 7.7 inches of rain making it a wet time to visit. This rainfall is typically spread over 16 days, although this may vary considerably.
On the flip side this corresponds to an average of 6 hours of sunshine per day.
September temperatures in Sasebo
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Sasebo in September 2025.
Other monthly averages
Best places to visit in September
Sasebo weather stats
| Hottest month: | August | 30.8°C 87.4°F |
|---|---|---|
| Driest month: | December | 68mm 2.7ins |
| Sunniest month: | August | 7.4hrs |
| Coldest month: | January | 9°C 48.2°F |
| Wettest month: | July | 340mm 13.4ins |
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