Union Grove State Park Weather Forecast

    • 68
    • 91

    Chance Thunderstorms

    • 65
    • 87

    Slight Chance Thunderstorms

    • 64
    • 88

    Chance Thunderstorms

    • 61
    • 83

    Chance Thunderstorms

    • 58
    • 79

    Chance Rain Showers

    • 54
    • 75

    Chance Rain Showers

Today 14 Sep Tama

Mostly cloudy. Humid with Highs in the lower 90s. Southeast Winds 5 to 10 Mph.

Tonight 14 Sep Tama

Mostly cloudy with a chance of Showers and Thunderstorms. Humid with Lows in the upper 60s. Southeast Winds around 5 Mph. Chance of rain 30 percent.

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Union Grove State Park Temperature Statistics

September Temperature

Marshalltown, Marshalltown Municipal Airport (9.9 miles)

  • Lowest 7 September, 2025

    37.9 °F

  • Average September

    61.1 °F

  • Highest 11 September, 2025

    84 °F

Climate (2020–Present)

Marshalltown, Marshalltown Municipal Airport (9.9 miles)

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  • Average Low 2020–2025

    39.4 °F

  • Average 2020–2025

    50.1 °F

  • Average High 2020–2025

    60.8 °F
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