Mount Vernon Weather Forecast

    • 49
    • 69

    Chance Rain Showers

    • 52
    • 81

    Rain Showers Likely

    • 45
    • 68

    Slight Chance Rain Showers

    • 42
    • 68

    Mostly Sunny

    • 43
    • 69

    Mostly Sunny

    • 48
    • 74

    Mostly Sunny

Today 4 Sep Knox

Mostly cloudy with a chance of Showers and Thunderstorms. Cooler with Highs in the upper 60s. West Winds around 10 Mph, becoming northwest this afternoon. Chance of rain 50 percent.

Tonight 4 Sep Knox

Mostly clear. Lows in the upper 40s. West Winds around 5 Mph, becoming south after midnight.

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Mount Vernon Temperature Statistics

September Temperature

Knox County Airfield (4.3 miles)

  • Lowest 1 September, 2025

    51.8 °F

  • Average September

    64.8 °F

  • Highest 2 September, 2025

    80.6 °F

Climate (2020–Present)

Knox County Airfield (4.3 miles)

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  • Average Low 2020–2025

    43.3 °F

  • Average 2020–2025

    52.2 °F

  • Average High 2020–2025

    61.5 °F
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