Roscommon Weather in September

What's the weather like in Roscommon (Michigan) in September 2025?

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

September is in the fall / autumn in Roscommon and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 20°C (68°F), whilst at night 8°C (47°F) is normal.

Roscommon weather averages (imperial / metric)
Daytime temperature 19.9°C 67.7°F
Nightly temperature 8.2°C 46.7°F
Average temperature 14°C 57.2°F
Daily sunshine 7 hrs
Avg rainfall 88 mm 3.5 ins
Rainy days 12 days
Sea temperature 17.1°C 62.8°F
Humidity 79%
Windspeed 13kph 8 mph

On average September is the wettest month of the year in Roscommon 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 7 hours of sunshine per day.

September temperatures in Roscommon

Roscommon average temperature in September

September rainfall

Roscommon average rain in September

September hourly sunshine

Roscommon average rain in September

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 Roscommon in September 2025.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Roscommon weather stats

Roscommon weather statistics
Hottest month: July 26.1°C 79°F
Driest month: February 29mm 1.1ins
Sunniest month: July 10.7hrs
Coldest month: January -3.9°C 25°F
Wettest month: September 88mm 3.5ins
Map showing location of Roscommon (44.49835, -84.59197) Roscommon map pin © Google

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