Grinnell Regional Airport Weather Forecast

    • 72
    • 86

    Chance Thunderstorms

    • 75
    • 92

    Slight Chance Thunderstorms

    • 73
    • 93

    Slight Chance Thunderstorms

    • 72
    • 93

    Slight Chance Thunderstorms

    • 71
    • 92

    Chance Thunderstorms

    • 71
    • 91

    Slight Chance Thunderstorms

Today 29 Aug Poweshiek

Mostly cloudy with a chance of Showers and Thunderstorms this Morning, then partly sunny with a slight chance of Showers this afternoon. Highs in the mid 80s. South Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 50 percent.

Tonight 29 Aug Poweshiek

Partly cloudy. Lows in the lower 70s. South Winds 10 to 15 Mph. Gusts up to 30 Mph in the evening.

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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 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 (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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