Grinnell Weather Forecast

    • 60
    • 82

    Mostly Sunny

    • 58
    • 81

    Mostly Sunny

    • 65
    • 83

    Mostly Sunny

    • 72
    • 86

    Partly Sunny

    • 73
    • 93

    Chance Thunderstorms

    • 70
    • 91

    Chance Thunderstorms

Today 26 Aug Poweshiek

Sunny. Highs in the lower 80s. Northwest Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 26 Aug Poweshiek

Mostly clear. Lows around 60. Northwest Winds 5 to 10 Mph.

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  • Temperature Real-Time

Grinnell Temperature Statistics

August Temperature

Newton Municipal Airport - Earl Johnson Field (15.5 miles)

  • Lowest 23 August, 2026

    53.6 °F

  • Average August

    73 °F

  • Highest 11 August, 2026

    89.6 °F

Climate (2021–2026)

Newton Municipal Airport - Earl Johnson Field (15.5 miles)

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  • Average Low 2021–2026

    41.4 °F

  • Average 2021–2026

    51.3 °F

  • Average High 2021–2026

    61.4 °F
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