Mount Vernon Weather Forecast

    • 54
    • 80

    Increasing Clouds

    • 48
    • 77

    Mostly Sunny

    • 45
    • 78

    Sunny

    • 48
    • 80

    Mostly Sunny

    • 54
    • 84

    Mostly Sunny

    • 59
    • 89

    Mostly Sunny

Today 5 Sep Jefferson

Sunny in the Morning, then partly sunny with a slight chance of Showers in the afternoon. Highs in the upper 70s. West Winds 5 to 10 Mph, becoming northwest in the afternoon. Chance of rain 20 percent.

Tonight 5 Sep Jefferson

Mostly clear. Near steady temperature in the mid 50s. South Winds around 5 Mph.

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Mount Vernon Temperature Statistics

September Temperature

Mount Vernon Airport (2.5 miles)

  • Lowest 1 September, 2025

    53.1 °F

  • Average September

    70 °F

  • Highest 1 September, 2025

    84.9 °F

Climate (2020–Present)

Mount Vernon Airport (2.5 miles)

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  • Average Low 2020–2025

    45.7 °F

  • Average 2020–2025

    56.7 °F

  • Average High 2020–2025

    67.8 °F
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