Union Grove State Park Weather Forecast

    • 27
    • 34

    Increasing Clouds

    • 32
    • 43

    Mostly Cloudy

    • 29
    • 40

    Mostly Cloudy

    • 36
    • 45

    Mostly Cloudy

    • 28
    • 50

    Mostly Cloudy

    • 27
    • 38

    Mostly Cloudy

Today 21 Dec Tama

Mostly sunny. Highs in the mid 30s. Northeast Winds around 5 Mph, becoming south.

Tonight 21 Dec Tama

Mostly cloudy and not as cool. Near steady temperature in the upper 20s. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

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Union Grove State Park Temperature Statistics

December Temperature

Marshalltown, Marshalltown Municipal Airport (9.9 miles)

  • Lowest 14 December, 2025

    -16.1 °F

  • Average December

    17.6 °F

  • Highest 9 December, 2025

    41 °F

Climate (2020–Present)

Marshalltown, Marshalltown Municipal Airport (9.9 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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