Lincoln Weather in September

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

The climate in Lincoln during September can be summarized as warm and a little damp.

September is in the fall / autumn in Lincoln and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 26°C (79°F), whilst at night 13°C (55°F) is normal.

Lincoln weather averages (imperial / metric)
Daytime temperature 25.9°C 78.6°F
Nightly temperature 12.5°C 54.5°F
Average temperature 19.2°C 66.6°F
Daily sunshine 8.7 hrs
Avg rainfall 88 mm 3.5 ins
Rainy days 9 days
Sea temperature 19.6°C 67.3°F
Humidity 72%
Windspeed 14.4kph 9 mph

On average September is the 6th wettest month of the year in Lincoln with around 88mm 3.5 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 8.7 hours of sunshine per day.

September temperatures in Lincoln

Lincoln average temperature in September

September rainfall

Lincoln average rain in September

September hourly sunshine

Lincoln 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 Lincoln 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

Lincoln weather stats

Lincoln weather statistics
Hottest month: July 30.5°C 86.9°F
Driest month: February 42mm 1.7ins
Sunniest month: July 11hrs
Coldest month: January -0.2°C 31.6°F
Wettest month: May 109mm 4.3ins
Map showing location of Lincoln (40.14838, -89.36482) Lincoln map pin © Google

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