Mount Vernon Weather Forecast

    • 46
    • 65

    Increasing Clouds

    • 47
    • 67

    Mostly Sunny

    • 50
    • 68

    Mostly Sunny

    • 50
    • 67

    Mostly Sunny

    • 53
    • 68

    Partly Sunny

    • 58
    • 70

    Chance Rain Showers

Today 25 Sep Knox

Mostly sunny in the Morning, then becoming partly cloudy. Highs in the mid 60s. Northeast Winds 5 to 10 Mph.

Tonight 25 Sep Knox

Partly cloudy in the Evening, then clearing. Lows in the mid 40s. North Winds 5 to 10 Mph.

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Mount Vernon Temperature Statistics

September Temperature

Knox County Airfield (4.3 miles)

  • Lowest 14 September, 2026

    51.8 °F

  • Average September

    70.3 °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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