Ontonagon Weather in September

The climate in Ontonagon during September can be summarized as mild and a little damp.

September is in the fall / autumn in Ontonagon and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 19°C (65°F), whilst at night 7°C (45°F) is normal.

On average September is the 3rd wettest month of the year in Ontonagon with around 88mm 3.5 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 12 days, although this may vary considerably.

On the flip side this corresponds to an average of 6.7 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 Ontonagon in September 2024.