Grinnell Weather Forecast

    • 66
    • 85

    Chance Rain Showers

    • 63
    • 85

    Mostly Sunny

    • 64
    • 86

    Mostly Sunny

    • 65
    • 88

    Sunny

    • 67
    • 90

    Mostly Sunny

    • 68
    • 91

    Mostly Sunny

Today 10 Jul Poweshiek

Mostly cloudy with a slight chance of Showers and Thunderstorms. Near steady temperature in the mid 80s. East Winds around 5 Mph. Chance of rain 20 percent.

Tonight 10 Jul Poweshiek

Mostly cloudy. A chance of Showers and Thunderstorms this evening. Lows in the mid 60s. Northeast Winds around 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Temperature Statistics

July Temperature

Newton Municipal Airport - Earl Johnson Field (15.5 miles)

  • Lowest 2 July, 2026

    64.4 °F

  • Average July

    77.8 °F

  • Highest 1 July, 2026

    89.6 °F

Climate (2021–2026)

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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