Grinnell Regional Airport Weather Forecast

    • 69
    • 84

    Chance Thunderstorms

    • 61
    • 82

    Partly Sunny

    • 63
    • 81

    Mostly Sunny

    • 65
    • 84

    Mostly Cloudy

    • 60
    • 80

    Slight Chance Thunderstorms

    • 59
    • 76

    Slight Chance Thunderstorms

Today 15 Aug Poweshiek

Patchy fog in the morning. Mostly cloudy with a chance of Showers and Thunderstorms in the Morning, then partly sunny with a slight chance of Showers and Thunderstorms in the afternoon. Some Thunderstorms may produce heavy rainfall in the morning. Humid with Highs in the upper 80s. South Winds around 5 Mph, becoming west in the afternoon. Chance of rain 50 percent. Heat index Values up to 105 in the afternoon.

Tonight 15 Aug Poweshiek

Cloudy with a chance of Showers and Thunderstorms. Patchy fog. Some Thunderstorms may produce heavy rainfall. Locally heavy rainfall possible. Near steady temperature in the lower 70s. East Winds around 5 Mph. Chance of rain 50 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

    73.7 °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

    41.4 °F

  • Average 2021–2026

    51.3 °F

  • Average High 2021–2026

    61.4 °F
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