Seto Weather in September
What's the weather like in Seto (Aichi) in September 2025?
The climate in Seto during September can be summarized as hot, humid and very wet.
September is in the fall / autumn in Seto and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a muggy 28°C (81°F), whilst at night 19°C (67°F) is normal.
| Daytime temperature | 27.5°C 81.4°F |
|---|---|
| Nightly temperature | 19.4°C 66.8°F |
| Average temperature | 23.4°C 74.1°F |
| Daily sunshine | 5 hrs |
| Avg rainfall | 216 mm 8.5 ins |
| Rainy days | 18 days |
| Sea temperature | 26°C 78.8°F |
| Humidity | 76% |
| Windspeed | 8.6kph 5 mph |
On average September is the 3rd wettest month of the year in Seto with around 216mm 8.5 inches of rain making it a very wet time to visit. This rainfall is typically spread over 18 days, although this may vary considerably.
On the flip side this corresponds to an average of 5 hours of sunshine per day.
September temperatures in Seto
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 Seto in September 2025.
Other monthly averages
Best places to visit in September
Seto weather stats
| Hottest month: | August | 31.5°C 88.7°F |
|---|---|---|
| Driest month: | December | 39mm 1.5ins |
| Sunniest month: | January | 5.7hrs |
| Coldest month: | January | 7.5°C 45.5°F |
| Wettest month: | June | 239mm 9.4ins |
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