Mount Vernon Weather in September

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

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

September is in the fall / autumn in Mount Vernon and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a muggy 27°C (80°F), whilst at night 14°C (56°F) is normal.

Mount Vernon weather averages (imperial / metric)
Daytime temperature 26.9°C 80.4°F
Nightly temperature 13.5°C 56.3°F
Average temperature 20.2°C 68.4°F
Daily sunshine 8.8 hrs
Avg rainfall 83 mm 3.3 ins
Rainy days 8 days
Sea temperature 21.6°C 70.9°F
Humidity 72%
Windspeed 12.6kph 8 mph

On average September is the 5th driest month of the year in Mount Vernon with around 83mm 3.3 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 8.8 hours of sunshine per day.

September temperatures in Mount Vernon

Mount Vernon average temperature in September

September rainfall

Mount Vernon average rain in September

September hourly sunshine

Mount Vernon 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 Mount Vernon 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

Mount Vernon weather stats

Mount Vernon weather statistics
Hottest month: July 31.2°C 88.2°F
Driest month: January 59mm 2.3ins
Sunniest month: July 11hrs
Coldest month: January 3.1°C 37.6°F
Wettest month: May 113mm 4.4ins
Map showing location of Mount Vernon (38.31727, -88.90312) Mount Vernon map pin © Google

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