Grinnell Regional Airport Weather Forecast

    • 68
    • 90

    Rain Showers

    • 66
    • 88

    Chance Thunderstorms

    • 63
    • 84

    Partly Sunny

    • 62
    • 84

    Mostly Sunny

    • 64
    • 87

    Mostly Sunny

    • 67
    • 89

    Chance Thunderstorms

    • 66
    • 88

    Chance Rain Showers

Today 3 Jul Poweshiek

Mostly sunny with a chance of Showers and Thunderstorms. Some Thunderstorms may produce heavy rainfall. Near steady temperature in the upper 80s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain 30 percent.

Tonight 3 Jul Poweshiek

Mostly cloudy with a chance of Thunderstorms. A chance of Showers early this Evening, then Showers. Some Thunderstorms may produce heavy rainfall. Lows in the upper 60s. Southeast Winds around 5 Mph. Chance of rain 60 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Regional Airport Temperature Statistics

July Temperature

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

  • Lowest 1 July, 2026

    77 °F

  • Average July

    82.9 °F

  • Highest 1 July, 2026

    89.6 °F

Climate (2021–2026)

Newton Municipal Airport - Earl Johnson Field (14.9 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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