Grinnell Regional Airport Weather Forecast

    • 73
    • 91

    Slight Chance Thunderstorms

    • 65
    • 90

    Rain Showers

    • 57
    • 83

    Rain Showers

    • 60
    • 82

    Sunny

    • 58
    • 84

    Chance Thunderstorms

    • 54
    • 76

    Slight Chance Thunderstorms

Today 9 Jun Poweshiek

Mostly sunny. Highs in the lower 90s. Southeast Winds 5 to 10 Mph. Heat index Values up to 100 this afternoon.

Tonight 9 Jun Poweshiek

Partly cloudy with a slight chance of Showers and Thunderstorms. Humid with Lows in the lower 70s. South Winds 5 to 10 Mph with Gusts up to 25 Mph. Chance of rain 20 percent. Heat index Values up to 101 early in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Grinnell Regional Airport Temperature Statistics

June Temperature

Newton Municipal Airport - Earl Johnson Field (14.9 miles)

  • Lowest 2 June, 2026

    55.4 °F

  • Average June

    73.3 °F

  • Highest 1 June, 2026

    87.8 °F

Climate (2021–Present)

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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