Mount Vernon Weather Forecast

    • 67
    • 83

    Chance Rain Showers

    • 67
    • 86

    Rain Showers Likely

    • 64
    • 84

    Rain Showers Likely

    • 58
    • 78

    Partly Sunny

    • 65
    • 81

    Chance Rain Showers

    • 63
    • 81

    Rain Showers Likely

    • 60
    • 77

    Chance Rain Showers

Today 15 Sep Knox

Mostly sunny. Not as cool with Highs in the lower 80s. South Winds 5 to 10 Mph.

Tonight 15 Sep Knox

Mostly clear. A chance of Showers with a slight chance of Thunderstorms after midnight. Not as cool. Humid with Lows in the mid 60s. South Winds 5 to 10 Mph. Chance of rain 30 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

    73.1 °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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