Hardin Weather in September

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

The climate in Hardin during September can be summarized as warm, humid and a little damp.

September is in the fall / autumn in Hardin and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 26°C (79°F), whilst at night 14°C (57°F) is normal.

Hardin weather averages (imperial / metric)
Daytime temperature 26.2°C 79.1°F
Nightly temperature 13.9°C 56.9°F
Average temperature 20°C 68°F
Daily sunshine 8.5 hrs
Avg rainfall 87 mm 3.4 ins
Rainy days 8 days
Sea temperature 20.4°C 68.7°F
Humidity 72%
Windspeed 14.4kph 9 mph

On average September is the 5th wettest month of the year in Hardin with around 87mm 3.4 inches of rain making it a a little damp time to visit. This rainfall is typically spread over 8 days, although this may vary considerably.

On the flip side this corresponds to an average of 8.5 hours of sunshine per day.

September temperatures in Hardin

Hardin average temperature in September

September rainfall

Hardin average rain in September

September hourly sunshine

Hardin 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 Hardin 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

Hardin weather stats

Hardin weather statistics
Hottest month: July 30.9°C 87.6°F
Driest month: January 41mm 1.6ins
Sunniest month: July 10.7hrs
Coldest month: January 2°C 35.6°F
Wettest month: May 105mm 4.1ins
Map showing location of Hardin (39.15671, -90.6179) Hardin map pin © Google

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