Nagato Weather in September
What's the weather like in Nagato (Yamaguchi) in September 2025?
The climate in Nagato during September can be summarized as warm, humid and very wet.
September is in the fall / autumn in Nagato and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a muggy 26°C (79°F), whilst at night 19°C (66°F) is normal.
| Daytime temperature | 25.9°C 78.6°F |
|---|---|
| Nightly temperature | 18.7°C 65.7°F |
| Average temperature | 22.3°C 72.1°F |
| Daily sunshine | 5.6 hrs |
| Avg rainfall | 206 mm 8.1 ins |
| Rainy days | 17 days |
| Sea temperature | 25.7°C 78.3°F |
| Humidity | 80% |
| Windspeed | 9kph 6 mph |
On average September is the 3rd wettest month of the year in Nagato with around 206mm 8.1 inches of rain making it a very wet time to visit. This rainfall is typically spread over 17 days, although this may vary considerably.
On the flip side this corresponds to an average of 5.6 hours of sunshine per day.
September temperatures in Nagato
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 Nagato in September 2025.
Other monthly averages
Best places to visit in September
Nagato weather stats
| Hottest month: | August | 29.7°C 85.5°F |
|---|---|---|
| Driest month: | December | 72mm 2.8ins |
| Sunniest month: | August | 7hrs |
| Coldest month: | January | 7.8°C 46°F |
| Wettest month: | July | 275mm 10.8ins |
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