Grinnell Regional Airport Weather Forecast

    • 62
    • 84

    Thunderstorms

    • 56
    • 74

    Rain Showers

    • 60
    • 80

    Mostly Sunny

    • 65
    • 84

    Mostly Sunny

    • 70
    • 88

    Slight Chance Thunderstorms

    • 69
    • 89

    Chance Thunderstorms

Today 4 Aug Poweshiek

Partly sunny. A chance of Showers and Thunderstorms this afternoon. Highs in the mid 80s. Southwest Winds around 5 Mph, becoming northwest this afternoon. Chance of rain 50 percent.

Tonight 4 Aug Poweshiek

Mostly cloudy. A chance of Showers and Thunderstorms in the Evening, then Showers and Thunderstorms after midnight. Humid with Lows in the lower 60s. North Winds 5 to 10 Mph. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

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

    72 °F

  • Highest 2 August, 2026

    82.4 °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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