Kōya Weather in September
What's the weather like in Kōya (Japan) in September 2025?
The climate in Kōya during September can be summarized as warm, humid and very wet.
September is in the fall / autumn in Kōya and is typically the 3rd warmest month of the year. Daytime maximum temperatures average around a muggy 25°C (77°F), whilst at night 18°C (64°F) is normal.
| Daytime temperature | 25°C 76.9°F |
|---|---|
| Nightly temperature | 17.7°C 63.8°F |
| Average temperature | 21.3°C 70.3°F |
| Daily sunshine | 5 hrs |
| Avg rainfall | 272 mm 10.7 ins |
| Rainy days | 18 days |
| Sea temperature | 26.4°C 79.5°F |
| Humidity | 79% |
| Windspeed | 12.2kph 8 mph |
On average September is the 2nd wettest month of the year in Kōya with around 272mm 10.7 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 Kōya
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 Kōya in September 2025.
Other monthly averages
Best places to visit in September
Kōya weather stats
| Hottest month: | August | 28.4°C 83.1°F |
|---|---|---|
| Driest month: | December | 42mm 1.7ins |
| Sunniest month: | December | 5.1hrs |
| Coldest month: | January | 6.2°C 43.2°F |
| Wettest month: | June | 295mm 11.6ins |
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