Grinnell Regional Airport Weather Forecast

    • 56
    • 61

    Rain Showers

    • 57
    • 65

    Chance Rain Showers

    • 58
    • 69

    Mostly Cloudy

    • 60
    • 67

    Rain Showers

    • 60
    • 68

    Rain Showers Likely

    • 55
    • 66

    Chance Rain Showers

Today 26 Sep Poweshiek

Cloudy. Showers, mainly this morning. Near steady temperature in the upper 50s. Southeast Winds 5 to 10 Mph. Chance of rain 80 percent.

Tonight 26 Sep Poweshiek

Cloudy with a chance of Showers. A slight chance of Thunderstorms after midnight. Lows in the mid 50s. Southeast Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Regional Airport Temperature Statistics

September Temperature

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

  • Lowest 23 September, 2026

    50 °F

  • Average September

    70.2 °F

  • Highest 1 September, 2026

    93.2 °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

    51.3 °F

  • Average High 2021–2026

    61.3 °F
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