Coulee Dam Weather Forecast

    • 49
    • 78

    Mostly Sunny

    • 55
    • 88

    Partly Sunny

    • 46
    • 74

    Rain Showers Likely

    • 45
    • 71

    Mostly Sunny

    • 42
    • 69

    Partly Sunny

    • 41
    • 67

    Mostly Sunny

    • 44
    • 71

    Partly Sunny

Today 11 May Upper Columbia Basin

Sunny. Highs in the mid to upper 70s. West wind 5 to 10 Mph.

Tonight 11 May Upper Columbia Basin

Mostly clear. Lows in the mid 40s to lower 50s. Light Wind, becoming northeast 5 to 10 Mph overnight.

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Coulee Dam Temperature Statistics

May Temperature

Omak Airport (42.3 miles)

  • Lowest 1 May, 2026

    39.7 °F

  • Average May

    65.7 °F

  • Highest 3 May, 2026

    86.6 °F

Climate (2021–Present)

Omak Airport (42.3 miles)

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  • Average Low 2021–2026

    41 °F

  • Average 2021–2026

    52 °F

  • Average High 2021–2026

    63 °F
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