Grinnell Regional Airport Weather Forecast

    • 63
    • 82

    Increasing Clouds

    • 51
    • 77

    Mostly Sunny

    • 48
    • 73

    Mostly Sunny

    • 47
    • 69

    Mostly Sunny

    • 47
    • 71

    Mostly Sunny

    • 53
    • 75

    Partly Sunny

Today 22 Aug Poweshiek

Patchy fog in the morning. Mostly sunny. Highs in the lower 80s. Light and variable Winds, becoming southwest around 5 Mph in the afternoon.

Tonight 22 Aug Poweshiek

Mostly cloudy with a slight chance of Thunderstorms. A slight chance of Showers in the Evening, then a chance of Showers after midnight. Lows in the lower 60s. Light and variable Winds, becoming west around 5 Mph after midnight. Chance of rain 50 percent.

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  • Temperature Real-Time

Grinnell Regional Airport Temperature Statistics

August Temperature

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

  • Lowest 1 August, 2025

    57.2 °F

  • Average August

    74.2 °F

  • Highest 16 August, 2025

    91.4 °F

Climate (2020–Present)

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

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  • Average Low 2020–2025

    41.3 °F

  • Average 2020–2025

    51 °F

  • Average High 2020–2025

    61 °F
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