Grinnell Regional Airport Weather Forecast

    • 74
    • 92

    Becoming Sunny

    • 74
    • 93

    Mostly Sunny

    • 75
    • 92

    Slight Chance Thunderstorms

    • 73
    • 93

    Slight Chance Thunderstorms

    • 71
    • 95

    Chance Rain Showers

    • 67
    • 91

    Slight Chance Rain Showers

Today 1 Sep Poweshiek

Mostly sunny. Highs in the lower 90s. Southwest Winds 5 to 10 Mph.

Tonight 1 Sep Poweshiek

Mostly clear. Humid with Lows in the mid 70s. South Winds 5 to 10 Mph.

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Grinnell Regional Airport Temperature Statistics

September Temperature

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

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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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