Grinnell Weather Forecast

    • 29
    • 40

    Chance Snow

    • 18
    • 34

    Partly Sunny

    • 25
    • 31

    Partly Sunny

    • 34
    • 44

    Mostly Cloudy

    • 29
    • 50

    Slight Chance Rain

    • 18
    • 32

    Mostly Cloudy

    • 24
    • 31

    Mostly Cloudy

Today 9 Jan Poweshiek

Sunny. Near steady temperature in the upper 30s. North Winds 5 to 10 Mph.

Tonight 9 Jan Poweshiek

Mostly sunny Early, then becoming mostly cloudy. A chance of snow with a slight chance of freezing rain after midnight. Little or no snow accumulation. Lows in the upper 20s. Northwest Winds around 5 Mph. Chance of precipitation 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Temperature Statistics

January Temperature

Newton Municipal Airport - Earl Johnson Field (15.5 miles)

  • Lowest 1 January, 2026

    14 °F

  • Average January

    30.6 °F

  • Highest 7 January, 2026

    57.2 °F

Climate (2021–Present)

Newton Municipal Airport - Earl Johnson Field (15.5 miles)

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  • Average Low 2021–2026

    41.5 °F

  • Average 2021–2026

    51.3 °F

  • Average High 2021–2026

    61.2 °F
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