Grand Coulee Weather Forecast

    • 33
    • 54

    Partly Sunny

    • 34
    • 53

    Mostly Cloudy

    • 31
    • 53

    Chance Rain/Snow

    • 37
    • 53

    Mostly Cloudy

    • 36
    • 55

    Partly Sunny

    • 37
    • 55

    Mostly Cloudy

Today 28 Oct Upper Columbia Basin

Rain Showers in the Morning, then a chance of rain Showers in the afternoon. Highs in the lower to mid 50s. Breezy. Southwest wind 10 to 20 Mph with Gusts up to 30 Mph. Chance of precipitation near 100 percent. Rainfall Amounts less than a tenth of an inch.

Tonight 28 Oct Upper Columbia Basin

Partly cloudy. Lows in the lower to mid 30s. South wind 5 to 10 Mph. Gusts up to 20 Mph in the evening.

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Grand Coulee Temperature Statistics

October Temperature

Omak Airport (42.9 miles)

  • Lowest 24 October, 2026

    29.6 °F

  • Average October

    53.8 °F

  • Highest 4 October, 2026

    79.6 °F

Climate (2021–2026)

Omak Airport (42.9 miles)

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  • Average Low 2021–2026

    40.8 °F

  • Average 2021–2026

    51.9 °F

  • Average High 2021–2026

    63 °F
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