Coulee Dam Weather Forecast

    • 54
    • 78

    Decreasing Clouds

    • 58
    • 85

    Sunny

    • 59
    • 89

    Mostly Sunny

    • 61
    • 91

    Mostly Sunny

    • 62
    • 91

    Mostly Sunny

    • 60
    • 91

    Partly Sunny

Today 15 Sep Upper Columbia Basin

Sunny. Highs in the lower to mid 70s. Southwest wind 5 to 10 Mph.

Tonight 15 Sep Upper Columbia Basin

Mostly clear. Lows in the upper 40s to lower 50s. East wind 5 to 10 Mph.

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Coulee Dam Temperature Statistics

September Temperature

Omak Airport (42.3 miles)

  • Lowest 12 September, 2025

    55 °F

  • Average September

    76.1 °F

  • Highest 3 September, 2025

    104 °F

Climate (2020–Present)

Omak Airport (42.3 miles)

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  • Average Low 2020–2025

    40.7 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    62.7 °F
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