Mount Vernon Weather in September

What's the weather like in Mount Vernon (Ohio) in September 2025?

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

September is in the fall / autumn in Mount Vernon and is typically the 4th warmest month of the year. Daytime maximum temperatures average around 24°C (75°F), whilst at night 11°C (52°F) is normal.

Mount Vernon weather averages (imperial / metric)
Daytime temperature 23.7°C 74.7°F
Nightly temperature 11.1°C 52°F
Average temperature 17.4°C 63.3°F
Daily sunshine 7.5 hrs
Avg rainfall 79 mm 3.1 ins
Rainy days 9 days
Sea temperature 21.4°C 70.4°F
Humidity 74%
Windspeed 12.2kph 8 mph

On average September is the 5th driest month of the year in Mount Vernon with around 79mm 3.1 inches of rain making it a reasonably dry 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 7.5 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 2025.

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 27.9°C 82.2°F
Driest month: February 53mm 2.1ins
Sunniest month: July 9.2hrs
Coldest month: January 0.3°C 32.5°F
Wettest month: July 107mm 4.2ins
Map showing location of Mount Vernon (40.3934, -82.48572) Mount Vernon map pin © Google

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