Grinnell Regional Airport Weather Forecast

    • 59
    • 73

    Chance Rain Showers

    • 63
    • 68

    Rain Showers

    • 64
    • 79

    Rain Showers Likely

    • 67
    • 82

    Rain Showers Likely

    • 63
    • 82

    Chance Thunderstorms

    • 58
    • 73

    Slight Chance Thunderstorms

Today 15 Sep Poweshiek

Mostly cloudy. Showers late this Morning, then a chance of Showers this afternoon. Highs in the lower 70s. Northwest Winds around 5 Mph. Chance of rain 90 percent.

Tonight 15 Sep Poweshiek

Mostly cloudy with a chance of Showers with a slight chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Lows in the upper 50s. Northeast Winds around 5 Mph. Chance of rain 40 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 13 September, 2026

    53.6 °F

  • Average September

    74.9 °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

    61.4 °F
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