Grinnell Regional Airport Weather Forecast

    • 57
    • 80

    Partly Sunny

    • 54
    • 70

    Rain Showers Likely

    • 65
    • 79

    Rain Showers

    • 59
    • 76

    Rain Showers

    • 60
    • 74

    Rain Showers Likely

    • 57
    • 75

    Chance Thunderstorms

Today 12 Sep Poweshiek

Mostly sunny. Highs around 80. West Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming north this afternoon.

Tonight 12 Sep Poweshiek

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 50s. North Winds around 5 Mph.

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  • Temperature Real-Time

Grinnell Regional Airport Temperature Statistics

September Temperature

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

  • Lowest 10 September, 2026

    60.8 °F

  • Average September

    77.6 °F

  • Highest 1 September, 2026

    93.2 °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

    51.4 °F

  • Average High 2021–2026

    61.4 °F
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