Mount Vernon Weather Forecast

    • 57
    • 66

    Thunderstorms Likely

    • 52
    • 63

    Chance Rain Showers

    • 49
    • 61

    Partly Sunny

    • 52
    • 64

    Partly Sunny

    • 56
    • 66

    Mostly Cloudy

    • 57
    • 69

    Partly Sunny

Today 20 Sep Linn

Cloudy. Patchy fog early this morning. Occasional Showers and Thunderstorms early. A chance of Showers and Thunderstorms this Morning, then a slight chance of Showers this afternoon. Locally heavy rainfall possible early this morning. Highs in the mid 60s. Northeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 80 percent.

Tonight 20 Sep Linn

Cloudy. A chance of Showers after midnight. Lows in the mid 50s. Northeast Winds around 15 Mph with Gusts up to 25 Mph. Chance of rain 40 percent.

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  • Temperature Real-Time

Mount Vernon Temperature Statistics

September Temperature

Cedar Rapids Airport (15.5 miles)

  • Lowest 13 September, 2026

    53.7 °F

  • Average September

    73.1 °F

  • Highest 3 September, 2026

    94.6 °F

Climate (2021–2026)

Cedar Rapids Airport (15.5 miles)

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  • Average Low 2021–2026

    40.7 °F

  • Average 2021–2026

    51.1 °F

  • Average High 2021–2026

    61.5 °F
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