Mount Vernon Weather Forecast

    • 54
    • 65

    Rain Showers Likely

    • 51
    • 63

    Rain Showers

    • 45
    • 66

    Partly Sunny

    • 45
    • 66

    Mostly Sunny

    • 46
    • 67

    Partly Sunny

    • 49
    • 69

    Partly Sunny

Today 22 Sep Knox

Cloudy with a 20 percent chance of Showers. Highs in the mid 60s. Northeast Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 22 Sep Knox

Cloudy. A chance of Showers in the Evening, then Showers likely after midnight. Lows in the mid 50s. East Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 70 percent.

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  • Temperature Real-Time

Mount Vernon Temperature Statistics

September Temperature

Knox County Airfield (4.3 miles)

  • Lowest 14 September, 2026

    51.8 °F

  • Average September

    71.7 °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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