Grinnell Regional Airport Weather Forecast

    • 46
    • 73

    Becoming Sunny

    • 43
    • 77

    Partly Sunny

    • 39
    • 65

    Mostly Sunny

    • 52
    • 70

    Chance Rain Showers

    • 48
    • 80

    Mostly Sunny

    • 48
    • 72

    Mostly Sunny

    • 55
    • 77

    Slight Chance Thunderstorms

Today 8 May Poweshiek

Sunny. Near steady temperature in the lower 70s. West Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 8 May Poweshiek

Partly cloudy with a chance of Sprinkles this Evening, then mostly clear after midnight. Lows in the mid 40s. Southwest Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Regional Airport Temperature Statistics

May Temperature

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

  • Lowest 1 May, 2026

    35.6 °F

  • Average May

    54.7 °F

  • Highest 4 May, 2026

    84.2 °F

Climate (2021–Present)

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

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  • Average Low 2021–2026

    41.6 °F

  • Average 2021–2026

    51.5 °F

  • Average High 2021–2026

    61.5 °F
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