Grand Coulee Dam Airport Weather Forecast

    • 67
    • 100

    Hot

    • 68
    • 96

    Areas Smoke

    • 68
    • 96

    Partly Sunny

    • 63
    • 89

    Chance Rain Showers

    • 60
    • 82

    Chance Rain Showers

    • 59
    • 75

    Chance Rain Showers

Today 4 Sep Upper Columbia Basin

Hot, sunny. Haze and Areas of smoke. Highs 96 to 100. East wind 5 to 10 Mph.

Tonight 4 Sep Upper Columbia Basin

Mostly clear. Haze and Areas of smoke. Lows in the 60s. East wind 5 to 15 Mph with Gusts up to 25 Mph.

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Grand Coulee Dam Airport Temperature Statistics

September Temperature

Omak Airport (42.3 miles)

  • Lowest 2 September, 2025

    69.1 °F

  • Average September

    83.1 °F

  • Highest 2 September, 2025

    100 °F

Climate (2020–Present)

Omak Airport (42.3 miles)

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  • Average Low 2020–2025

    40.6 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    62.7 °F
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