Grundy Center Weather Forecast

    • 72
    • 89

    Chance Thunderstorms

    • 69
    • 87

    Chance Thunderstorms

    • 62
    • 81

    Partly Sunny

    • 59
    • 78

    Mostly Sunny

    • 60
    • 79

    Mostly Sunny

    • 59
    • 81

    Mostly Sunny

Today 17 Aug Grundy

Sunny. Highs in the upper 80s. Southeast Winds 5 to 10 Mph.

Tonight 17 Aug Grundy

Partly cloudy in the Evening, then mostly cloudy with a chance of Showers and Thunderstorms after midnight. Humid with Lows in the lower 70s. Southeast Winds 5 to 10 Mph. Chance of rain 30 percent.

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Grundy Center Temperature Statistics

August Temperature

Marshalltown, Marshalltown Municipal Airport (18.6 miles)

  • Lowest 1 August, 2025

    54.6 °F

  • Average August

    71.7 °F

  • Highest 8 August, 2025

    88.6 °F

Climate (2020–Present)

Marshalltown, Marshalltown Municipal Airport (18.6 miles)

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  • Average Low 2020–2025

    39.4 °F

  • Average 2020–2025

    50.1 °F

  • Average High 2020–2025

    60.7 °F
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