Grinnell Regional Airport Weather Forecast

    • 58
    • 81

    Patchy Smoke

    • 55
    • 77

    Partly Sunny

    • 59
    • 79

    Mostly Cloudy

    • 60
    • 78

    Partly Sunny

    • 67
    • 87

    Mostly Sunny

    • 69
    • 94

    Mostly Sunny

Today 21 Jul Poweshiek

Mostly sunny. Patchy smoke. Highs in the lower 80s. Northwest Winds 15 to 20 Mph.

Tonight 21 Jul Poweshiek

Mostly clear. Patchy smoke. Lows in the upper 50s. Northwest Winds 10 to 15 Mph, becoming north around 5 Mph after midnight.

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Grinnell Regional Airport Temperature Statistics

July Temperature

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

  • Lowest 2 July, 2026

    64.4 °F

  • Average July

    76.5 °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

    41.5 °F

  • Average 2021–2026

    51.4 °F

  • Average High 2021–2026

    61.5 °F
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