Grinnell Regional Airport Weather Forecast

    • 63
    • 80

    Chance Thunderstorms

    • 59
    • 79

    Partly Sunny

    • 62
    • 80

    Chance Thunderstorms

    • 63
    • 82

    Chance Thunderstorms

    • 60
    • 79

    Mostly Sunny

    • 61
    • 78

    Slight Chance Thunderstorms

Today 18 Aug Poweshiek

Partly sunny with a chance of Showers and Thunderstorms. Highs around 80. Southwest Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 18 Aug Poweshiek

Partly cloudy. A chance of Showers and Thunderstorms in the Evening, then a slight chance of Showers after midnight. Humid with Lows in the lower 60s. Northwest Winds around 5 Mph. Chance of rain 40 percent.

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Grinnell Regional Airport Temperature Statistics

August Temperature

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

  • Lowest 1 August, 2026

    62.6 °F

  • Average August

    73.9 °F

  • Highest 11 August, 2026

    89.6 °F

Climate (2021–2026)

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

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  • Average Low 2021–2026

    41.5 °F

  • Average 2021–2026

    51.3 °F

  • Average High 2021–2026

    61.4 °F
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