Ashibetsu Weather in September

The climate in Ashibetsu during September can be summarized as mild and wet.

September is in the fall / autumn in Ashibetsu and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 20°C (67°F), whilst at night 10°C (50°F) is normal.

On average September is the 2nd wettest month of the year in Ashibetsu with around 135mm 5.3 inches of rain making it a 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 5.9 hours of sunshine per day.

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 Ashibetsu in September 2025.