Grand Coulee Weather Forecast

    • 37
    • 55

    Increasing Clouds

    • 43
    • 53

    Chance Rain

    • 38
    • 58

    Chance Rain

    • 38
    • 55

    Partly Sunny

    • 40
    • 53

    Slight Chance Rain

    • 42
    • 55

    Chance Rain

Today 30 Oct Upper Columbia Basin

Mostly sunny. Highs in the lower to mid 50s. Northeast wind 5 to 10 Mph.

Tonight 30 Oct Upper Columbia Basin

Mostly cloudy in the evening then clearing. Patchy fog overnight. Lows in the lower to mid 30s. Northeast wind 5 to 10 Mph.

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Grand Coulee Temperature Statistics

October Temperature

Omak Airport (42.9 miles)

  • Lowest 16 October, 2025

    28 °F

  • Average October

    49.4 °F

  • Highest 7 October, 2025

    73 °F

Climate (2020–Present)

Omak Airport (42.9 miles)

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  • Average Low 2020–2025

    40.7 °F

  • Average 2020–2025

    51.8 °F

  • Average High 2020–2025

    62.7 °F
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