Mount Carroll Weather in September

What's the weather like in Mount Carroll (Illinois) in September 2025?

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

September is in the fall / autumn in Mount Carroll and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (74°F), whilst at night 9°C (48°F) is normal.

Mount Carroll weather averages (imperial / metric)
Daytime temperature 23.5°C 74.3°F
Nightly temperature 8.7°C 47.7°F
Average temperature 16.1°C 61°F
Daily sunshine 8.1 hrs
Avg rainfall 93 mm 3.7 ins
Rainy days 9 days
Sea temperature 18.1°C 64.7°F
Humidity 74%
Windspeed 14.4kph 9 mph

On average September is the 6th wettest month of the year in Mount Carroll with around 93mm 3.7 inches of rain making it a a little damp 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 8.1 hours of sunshine per day.

September temperatures in Mount Carroll

Mount Carroll average temperature in September

September rainfall

Mount Carroll average rain in September

September hourly sunshine

Mount Carroll 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 Mount Carroll 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

Mount Carroll weather stats

Mount Carroll weather statistics
Hottest month: July 28.7°C 83.7°F
Driest month: February 33mm 1.3ins
Sunniest month: July 10.8hrs
Coldest month: January -2.8°C 27°F
Wettest month: June 115mm 4.5ins
Map showing location of Mount Carroll (42.09502, -89.97818) Mount Carroll map pin © Google

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