Grinnell Weather Forecast

    • 59
    • 87

    Sunny

    • 58
    • 86

    Partly Sunny

    • 60
    • 86

    Mostly Sunny

    • 58
    • 84

    Mostly Cloudy

    • 57
    • 80

    Chance Thunderstorms

    • 54
    • 78

    Slight Chance Thunderstorms

    • 54
    • 79

    Partly Sunny

Today 25 May Poweshiek

Sunny. Near steady temperature in the lower 80s. South Winds 15 to 20 Mph.

Tonight 25 May Poweshiek

Clear. Lows in the upper 50s. South Winds 10 to 15 Mph with Gusts up to 25 Mph, Diminishing to around 5 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Temperature Statistics

May Temperature

Newton Municipal Airport - Earl Johnson Field (15.5 miles)

  • Lowest 1 May, 2026

    35.6 °F

  • Average May

    60.8 °F

  • Highest 15 May, 2026

    87.8 °F

Climate (2021–Present)

Newton Municipal Airport - Earl Johnson Field (15.5 miles)

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  • Average Low 2021–2026

    41.6 °F

  • Average 2021–2026

    51.5 °F

  • Average High 2021–2026

    61.6 °F
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