Grinnell Weather Forecast

    • 66
    • 83

    Chance Thunderstorms

    • 68
    • 86

    Chance Thunderstorms

    • 65
    • 87

    Rain Showers

    • 61
    • 81

    Chance Thunderstorms

    • 64
    • 84

    Mostly Sunny

    • 72
    • 87

    Mostly Sunny

    • 73
    • 92

    Mostly Sunny

Today 15 Jun Poweshiek

Mostly cloudy with a chance of Showers and Thunderstorms. Highs in the mid 80s. Southeast Winds around 5 Mph. Chance of rain 50 percent.

Tonight 15 Jun Poweshiek

Mostly cloudy. Scattered Showers and Thunderstorms, mainly this evening. Lows in the mid 60s. Southeast Winds around 5 Mph. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Temperature Statistics

June Temperature

Newton Municipal Airport - Earl Johnson Field (15.5 miles)

  • Lowest 10 June, 2025

    48.2 °F

  • Average June

    69 °F

  • Highest 11 June, 2025

    93.2 °F

Climate (2020–Present)

Newton Municipal Airport - Earl Johnson Field (15.5 miles)

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  • Average Low 2020–2025

    41.2 °F

  • Average 2020–2025

    51 °F

  • Average High 2020–2025

    60.9 °F
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