Mount Sterling Weather in September

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

The climate in Mount Sterling during September can be summarized as warm and damp.

September is in the fall / autumn in Mount Sterling and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 26°C (78°F), whilst at night 13°C (55°F) is normal.

Mount Sterling weather averages (imperial / metric)
Daytime temperature 25.6°C 78°F
Nightly temperature 12.7°C 54.8°F
Average temperature 19.1°C 66.4°F
Daily sunshine 8.4 hrs
Avg rainfall 101 mm 4 ins
Rainy days 9 days
Sea temperature 20.4°C 68.7°F
Humidity 72%
Windspeed 14.8kph 9 mph

On average September is the 3rd wettest month of the year in Mount Sterling with around 101mm 4 inches of rain making it a 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 8.4 hours of sunshine per day.

September temperatures in Mount Sterling

Mount Sterling average temperature in September

September rainfall

Mount Sterling average rain in September

September hourly sunshine

Mount Sterling 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 Sterling 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 Sterling weather stats

Mount Sterling weather statistics
Hottest month: July 30.3°C 86.5°F
Driest month: January 38mm 1.5ins
Sunniest month: July 10.8hrs
Coldest month: January 0.2°C 32.4°F
Wettest month: May 110mm 4.3ins
Map showing location of Mount Sterling (39.98727, -90.76346) Mount Sterling map pin © Google

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