Marietta Weather Forecast

    • 2
    • 25

    Snow

    • -13
    • 7

    Snow

    • -7
    • 4

    Cold

    • 13
    • 28

    Partly Sunny

    • 26
    • 37

    Mostly Cloudy

    • 25
    • 42

    Mostly Cloudy

Today 12 Dec Marshall

Mostly cloudy. Highs in the mid 20s. Northwest Winds around 5 Mph, increasing to 10 to 15 Mph this afternoon.

Tonight 12 Dec Marshall

Cloudy. A chance of snow after midnight. Little or no snow accumulation. Lows around 2 above. Northwest Winds 5 to 10 Mph. Chance of snow 50 percent.

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Marietta Temperature Statistics

December Temperature

Marshalltown, Marshalltown Municipal Airport (4.3 miles)

  • Lowest 4 December, 2025

    -14.1 °F

  • Average December

    18.1 °F

  • Highest 9 December, 2025

    41 °F

Climate (2020–Present)

Marshalltown, Marshalltown Municipal Airport (4.3 miles)

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  • Average Low 2020–2025

    39.6 °F

  • Average 2020–2025

    50.3 °F

  • Average High 2020–2025

    60.9 °F
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