Grand Coulee Weather Forecast

    • 37
    • 46

    Chance Snow

    • 44
    • 57

    Mostly Cloudy

    • 50
    • 67

    Mostly Cloudy

    • 50
    • 67

    Chance Rain

    • 50
    • 69

    Slight Chance Rain

    • 49
    • 70

    Slight Chance Rain

Today 15 Mar Upper Columbia Basin

Partly sunny. Highs in the 40s. Southeast wind 5 to 10 Mph.

Tonight 15 Mar Upper Columbia Basin

Mostly cloudy with a chance of rain. A chance of snow. Lows in the 30s. Southeast wind 5 to 10 Mph. Chance of precipitation 40 percent.

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Grand Coulee Temperature Statistics

March Temperature

Omak Airport (42.9 miles)

  • Lowest 10 March, 2026

    21.9 °F

  • Average March

    43.3 °F

  • Highest 7 March, 2026

    70 °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

    63 °F
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