Mount Vernon Weather Forecast

    • 68
    • 85

    Chance Rain Showers

    • 67
    • 90

    Partly Sunny

    • 65
    • 91

    Partly Sunny

    • 67
    • 91

    Mostly Sunny

    • 67
    • 94

    Chance Thunderstorms

    • 66
    • 91

    Chance Rain Showers

Today 11 Sep Jefferson

Mostly cloudy. A chance of Showers with a slight chance of Thunderstorms in the afternoon. Highs in the mid 80s. East Winds around 5 Mph. Chance of rain 30 percent.

Tonight 11 Sep Jefferson

Mostly cloudy. Patchy fog. Near steady temperature in the upper 60s. Calm Winds.

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Mount Vernon Temperature Statistics

September Temperature

Mount Vernon Airport (2.5 miles)

  • Lowest 8 September, 2026

    55 °F

  • Average September

    81.4 °F

  • Highest 2 September, 2026

    100.9 °F

Climate (2021–2026)

Mount Vernon Airport (2.5 miles)

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  • Average Low 2021–2026

    46.8 °F

  • Average 2021–2026

    58.1 °F

  • Average High 2021–2026

    69.2 °F
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