Saint Charles Weather in September

What's the weather like in Saint Charles (Illinois) in September 2024?

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

September is in the fall / autumn in Saint Charles and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 11°C (52°F) is normal.

Saint Charles weather averages (imperial / metric)
Daytime temperature 23.8°C 74.8°F
Nightly temperature 11.3°C 52.3°F
Average temperature 17.5°C 63.5°F
Daily sunshine 8.1 hrs
Avg rainfall 92 mm 3.6 ins
Rainy days 9 days
Sea temperature 19.4°C 66.8°F
Humidity 72%
Windspeed 15.1kph 9 mph

On average September is the 5th wettest month of the year in Saint Charles with around 92mm 3.6 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 Saint Charles

Saint Charles average temperature in September

September rainfall

Saint Charles average rain in September

September hourly sunshine

Saint Charles 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 Saint Charles in September 2024.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Beta

Current (hourly) weather 15 day forecast

Saint Charles weather stats

Saint Charles weather statistics
Hottest month: July 28.5°C 83.3°F
Driest month: February 35mm 1.4ins
Sunniest month: July 10.9hrs
Coldest month: January -2.3°C 27.9°F
Wettest month: June 106mm 4.2ins
Map showing location of Saint Charles (41.91419, -88.30869) Saint Charles map pin © Google

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