Mount Vernon Weather Forecast

    • 67
    • 86

    Rain Showers

    • 58
    • 77

    Rain Showers Likely

    • 59
    • 79

    Partly Sunny

    • 65
    • 82

    Chance Rain Showers

    • 64
    • 83

    Slight Chance Thunderstorms

    • 67
    • 83

    Chance Rain Showers

Today 9 Sep Knox

Partly cloudy with a slight chance of Showers and Thunderstorms. Highs in the mid 80s. Southwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

Tonight 9 Sep Knox

A chance of Thunderstorms. Showers Likely, mainly in the evening. Humid with Lows in the upper 60s. West Winds 5 to 10 Mph. Chance of rain 70 percent.

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Mount Vernon Temperature Statistics

September Temperature

Knox County Airfield (4.3 miles)

  • Lowest 7 September, 2026

    57.2 °F

  • Average September

    74.1 °F

  • Highest 2 September, 2026

    91.4 °F

Climate (2021–2026)

Knox County Airfield (4.3 miles)

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  • Average Low 2021–2026

    43.4 °F

  • Average 2021–2026

    52.3 °F

  • Average High 2021–2026

    61.7 °F
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