Mount Vernon Weather in October

What's the weather like in Mount Vernon (Illinois) in October 2025?

The climate in Mount Vernon during October can be summarized as mild and reasonably dry.

October is in the fall / autumn in Mount Vernon and is typically the 6th warmest month of the year. Daytime maximum temperatures average around 21°C (69°F), whilst at night 7°C (44°F) is normal.

Mount Vernon weather averages (imperial / metric)
Daytime temperature 20.7°C 69.3°F
Nightly temperature 6.7°C 44.1°F
Average temperature 13.7°C 56.7°F
Daily sunshine 7.6 hrs
Avg rainfall 74 mm 2.9 ins
Rainy days 8 days
Sea temperature 17.2°C 63°F
Humidity 69%
Windspeed 14kph 9 mph

On average October is the 3rd driest month of the year in Mount Vernon with around 74mm 2.9 inches of rain making it a reasonably dry 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 7.6 hours of sunshine per day.

October temperatures in Mount Vernon

Mount Vernon average temperature in October

October rainfall

Mount Vernon average rain in October

October hourly sunshine

Mount Vernon average rain in October

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 October 2025.

Other monthly averages

Best places to visit in October

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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