Port Huron Weather in September

The climate in Port Huron during September can be summarized as mild and reasonably dry.

September is in the fall / autumn in Port Huron and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 22°C (72°F), whilst at night 12°C (54°F) is normal.

On average September is the 3rd wettest month of the year in Port Huron with around 76mm 3 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 9 days, although this may vary considerably.

On the flip side this corresponds to an average of 6.6 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 Port Huron in September 2025.