Union Grove State Park Weather Forecast

    • 64
    • 84

    Slight Chance Thunderstorms

    • 62
    • 83

    Partly Sunny

    • 63
    • 84

    Partly Sunny

    • 65
    • 86

    Mostly Sunny

    • 67
    • 87

    Chance Thunderstorms

    • 64
    • 84

    Chance Rain Showers

Today 4 Jul Tama

Partly sunny with a slight chance of Showers and Thunderstorms. Near steady temperature in the lower 80s. Northwest Winds around 5 Mph. Chance of rain 20 percent.

Tonight 4 Jul Tama

Mostly cloudy. A slight chance of Showers and Thunderstorms Early, then a chance of Showers and Thunderstorms this evening. A slight chance of Showers and Thunderstorms after midnight. Humid with Lows in the mid 60s. Northwest Winds around 5 Mph, becoming north. Chance of rain 40 percent.

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Union Grove State Park Temperature Statistics

July Temperature

Marshalltown, Marshalltown Municipal Airport (9.9 miles)

  • Lowest 2 July, 2026

    69.1 °F

  • Average July

    80.7 °F

  • Highest 1 July, 2026

    90.6 °F

Climate (2021–2026)

Marshalltown, Marshalltown Municipal Airport (9.9 miles)

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  • Average Low 2021–2026

    39.7 °F

  • Average 2021–2026

    50.5 °F

  • Average High 2021–2026

    61.3 °F
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