Grinnell Regional Airport Weather Forecast

    • 64
    • 75

    Rain Showers

    • 61
    • 71

    Rain Showers

    • 53
    • 66

    Rain Showers

    • 47
    • 63

    Mostly Sunny

    • 49
    • 63

    Partly Sunny

    • 45
    • 64

    Mostly Sunny

    • 48
    • 61

    Mostly Sunny

Today 29 Sep Poweshiek

Mostly cloudy with a 50 percent chance of Showers. Highs in the mid 70s. South Winds 5 to 10 Mph.

Tonight 29 Sep Poweshiek

A slight chance of Thunderstorms. Showers. Some Thunderstorms may produce heavy rainfall. Lows in the lower 60s. South Winds 5 to 10 Mph. Chance of rain near 100 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Regional Airport Temperature Statistics

September Temperature

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

  • Lowest 23 September, 2026

    50 °F

  • Average September

    69.2 °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

    51.3 °F

  • Average High 2021–2026

    61.3 °F
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