Grundy Center Municipal Airport Weather Forecast

    • 63
    • 83

    Increasing Clouds

    • 60
    • 79

    Partly Sunny

    • 59
    • 80

    Chance Thunderstorms

    • 51
    • 74

    Sunny

    • 46
    • 67

    Mostly Sunny

    • 45
    • 67

    Mostly Sunny

Today 20 Aug Grundy

Patchy fog this morning. Sunny. Highs in the lower 80s. North Winds 5 to 10 Mph.

Tonight 20 Aug Grundy

Mostly clear in the Evening, then becoming partly cloudy. Patchy fog after midnight. Humid with Lows in the lower 60s. East Winds around 5 Mph.

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Grundy Center Municipal Airport Temperature Statistics

August Temperature

Marshalltown, Marshalltown Municipal Airport (16.8 miles)

  • Lowest 1 August, 2025

    54.6 °F

  • Average August

    73 °F

  • Highest 16 August, 2025

    92.6 °F

Climate (2020–Present)

Marshalltown, Marshalltown Municipal Airport (16.8 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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