DeKalb Weather in September

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

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

September is in the fall / autumn in DeKalb and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 11°C (51°F) is normal.

DeKalb weather averages (imperial / metric)
Daytime temperature 23.8°C 74.8°F
Nightly temperature 10.8°C 51.4°F
Average temperature 17.3°C 63.1°F
Daily sunshine 8.1 hrs
Avg rainfall 96 mm 3.8 ins
Rainy days 9 days
Sea temperature 19.4°C 66.8°F
Humidity 73%
Windspeed 14.8kph 9 mph

On average September is the 4th wettest month of the year in DeKalb with around 96mm 3.8 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 DeKalb

DeKalb average temperature in September

September rainfall

DeKalb average rain in September

September hourly sunshine

DeKalb 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 DeKalb 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

DeKalb weather stats

DeKalb weather statistics
Hottest month: July 28.7°C 83.7°F
Driest month: February 30mm 1.2ins
Sunniest month: July 10.8hrs
Coldest month: January -2.7°C 27.1°F
Wettest month: June 110mm 4.3ins
Map showing location of DeKalb (41.92947, -88.75036) DeKalb map pin © Google

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