Evanston Weather in September

What's the weather like in Evanston (Wyoming) in September 2025?

The climate in Evanston during September can be summarized as mild and dry.

September is in the fall / autumn in Evanston and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 22°C (71°F), whilst at night 2°C (35°F) is normal.

Evanston weather averages (imperial / metric)
Daytime temperature 21.5°C 70.7°F
Nightly temperature 1.5°C 34.7°F
Average temperature 11.5°C 52.7°F
Daily sunshine 10.1 hrs
Avg rainfall 29 mm 1.1 ins
Rainy days 7 days
Sea temperature 16.3°C 61.3°F
Humidity 47%
Windspeed 15.5kph 10 mph

On average September is the 3rd wettest month of the year in Evanston with around 29mm 1.1 inches of rain making it a dry time to visit. This rainfall is typically spread over 7 days, although this may vary considerably.

On the flip side this corresponds to an average of 10.1 hours of sunshine per day.

September temperatures in Evanston

Evanston average temperature in September

September rainfall

Evanston average rain in September

September hourly sunshine

Evanston 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 Evanston 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

Evanston weather stats

Evanston weather statistics
Hottest month: July 27.4°C 81.3°F
Driest month: February 21mm 0.8ins
Sunniest month: July 12.2hrs
Coldest month: January -0.9°C 30.4°F
Wettest month: May 31mm 1.2ins
Map showing location of Evanston (41.26828, -110.96324) Evanston map pin © Google

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