Mount Vernon Weather Forecast

    • 68
    • 91

    Chance Thunderstorms

    • 67
    • 87

    Chance Thunderstorms

    • 57
    • 81

    Chance Rain Showers

    • 56
    • 79

    Mostly Sunny

    • 60
    • 81

    Partly Sunny

    • 64
    • 83

    Partly Sunny

Today 3 Sep Knox

Mostly sunny with a slight chance of Showers and Thunderstorms. Hot with Highs around 90. West Winds 5 to 10 Mph. Chance of rain 20 percent. Heat index Values in the upper 90s.

Tonight 3 Sep Knox

Partly cloudy with a slight chance of Showers and Thunderstorms. Humid with Lows in the upper 60s. Southwest Winds 5 to 10 Mph. Chance of rain 20 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount Vernon Temperature Statistics

September Temperature

Knox County Airfield (4.3 miles)

  • Lowest 1 September, 2026

    68 °F

  • Average September

    75.6 °F

  • Highest 1 September, 2026

    84.2 °F

Climate (2021–2026)

Knox County Airfield (4.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    43.4 °F

  • Average 2021–2026

    52.3 °F

  • Average High 2021–2026

    61.7 °F
Get WillyWeather+ to remove ads