Grundy Center Weather Forecast

    • 64
    • 81

    Mostly Sunny

    • 62
    • 82

    Slight Chance Thunderstorms

    • 58
    • 79

    Mostly Sunny

    • 58
    • 76

    Mostly Cloudy

    • 61
    • 77

    Slight Chance Thunderstorms

    • 63
    • 81

    Slight Chance Thunderstorms

Today 20 Aug Grundy

Sunny. Highs in the lower 80s. East Winds around 5 Mph, becoming south in the afternoon.

Tonight 20 Aug Grundy

Clear. Lows in the upper 50s. Northeast Winds around 5 Mph.

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  • Temperature Real-Time

Grundy Center Temperature Statistics

August Temperature

Marshalltown, Marshalltown Municipal Airport (18.6 miles)

  • Lowest 9 August, 2026

    54.6 °F

  • Average August

    73.2 °F

  • Highest 11 August, 2026

    90.6 °F

Climate (2021–2026)

Marshalltown, Marshalltown Municipal Airport (18.6 miles)

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  • Average Low 2021–2026

    39.8 °F

  • Average 2021–2026

    50.6 °F

  • Average High 2021–2026

    61.4 °F
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