Grinnell Weather Forecast

    • 68
    • 87

    Mostly Sunny

    • 63
    • 87

    Mostly Sunny

    • 57
    • 77

    Rain Showers Likely

    • 53
    • 69

    Rain Showers Likely

    • 47
    • 65

    Chance Rain Showers

    • 37
    • 58

    Partly Sunny

Today 11 Oct Poweshiek

Sunny. Highs in the upper 80s. South Winds around 10 Mph with Gusts up to 20 Mph.

Tonight 11 Oct Poweshiek

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the upper 60s. South Winds 5 to 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Temperature Statistics

October Temperature

Newton Municipal Airport - Earl Johnson Field (15.5 miles)

  • Lowest 3 October, 2026

    44.6 °F

  • Average October

    62.7 °F

  • Highest 9 October, 2026

    84.2 °F

Climate (2021–2026)

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

    61.3 °F
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