Union Grove State Park Weather Forecast

    • 44
    • 62

    Increasing Clouds

    • 45
    • 62

    Chance Rain Showers

    • 48
    • 61

    Rain Showers Likely

    • 51
    • 71

    Partly Sunny

    • 53
    • 78

    Mostly Sunny

    • 57
    • 82

    Partly Sunny

Today 20 May Tama

Sunny. Highs in the lower 60s. North Winds 5 to 10 Mph.

Tonight 20 May Tama

Mostly cloudy. Lows in the mid 40s. East Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Union Grove State Park Temperature Statistics

May Temperature

Marshalltown, Marshalltown Municipal Airport (9.9 miles)

  • Lowest 2 May, 2026

    28.7 °F

  • Average May

    57.5 °F

  • Highest 15 May, 2026

    87.7 °F

Climate (2021–Present)

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

    61.4 °F
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