Grand Coulee Weather Forecast

    • 48
    • 73

    Mostly Sunny

    • 50
    • 77

    Mostly Sunny

    • 53
    • 80

    Partly Sunny

    • 54
    • 83

    Partly Sunny

    • 54
    • 86

    Mostly Sunny

    • 56
    • 89

    Mostly Sunny

Today 29 Apr Upper Columbia Basin

Sunny. Highs in the upper 60s to lower 70s. East wind 5 to 10 Mph in the Morning, becoming light and variable.

Tonight 29 Apr Upper Columbia Basin

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

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Grand Coulee Temperature Statistics

April Temperature

Omak Airport (42.9 miles)

  • Lowest 16 April, 2026

    23.6 °F

  • Average April

    49.8 °F

  • Highest 6 April, 2026

    74.6 °F

Climate (2021–Present)

Omak Airport (42.9 miles)

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  • Average Low 2021–2026

    40.9 °F

  • Average 2021–2026

    52 °F

  • Average High 2021–2026

    62.9 °F
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