Coulee Dam Weather Forecast

    • 47
    • 71

    Decreasing Clouds

    • 49
    • 70

    Partly Sunny

    • 49
    • 71

    Mostly Cloudy

    • 47
    • 73

    Partly Sunny

    • 50
    • 76

    Mostly Sunny

    • 51
    • 78

    Partly Sunny

Today 29 Sep Upper Columbia Basin

Mostly cloudy with a 20 percent chance of rain Showers. Highs in the upper 60s to mid 70s. South wind 5 to 15 Mph. Gusts up to 20 Mph increasing to 30 Mph in the afternoon.

Tonight 29 Sep Upper Columbia Basin

Partly cloudy. Lows in the lower 40s to lower 50s. West wind 5 to 15 Mph. Gusts up to 30 Mph decreasing to 20 Mph overnight.

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Coulee Dam Temperature Statistics

September Temperature

Omak Airport (42.3 miles)

  • Lowest 26 September, 2026

    37.9 °F

  • Average September

    63.6 °F

  • Highest 21 September, 2026

    86.6 °F

Climate (2021–2026)

Omak Airport (42.3 miles)

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  • Average Low 2021–2026

    40.7 °F

  • Average 2021–2026

    51.8 °F

  • Average High 2021–2026

    62.9 °F
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