Grand Coulee Weather Forecast

    • 42
    • 50

    Rain

    • 40
    • 56

    Rain

    • 42
    • 53

    Rain

    • 37
    • 51

    Chance Rain/Snow

    • 34
    • 44

    Rain/Snow

    • 31
    • 44

    Slight Chance Rain/Snow

    • 31
    • 42

    Chance Snow

Today 14 Dec Upper Columbia Basin

Patchy fog in the morning. Mostly cloudy. Highs in the mid 40s to lower 50s. South wind 5 to 10 Mph.

Tonight 14 Dec Upper Columbia Basin

Mostly cloudy. A chance of rain overnight. Lows in the upper 30s to lower 40s. Southeast wind 5 to 10 Mph. Chance of precipitation 40 percent. Rainfall Amounts less than a tenth of an inch.

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Grand Coulee Temperature Statistics

December Temperature

Omak Airport (42.9 miles)

  • Lowest 1 December, 2025

    28.9 °F

  • Average December

    37.2 °F

  • Highest 9 December, 2025

    51.1 °F

Climate (2020–Present)

Omak Airport (42.9 miles)

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  • Average Low 2020–2025

    40.8 °F

  • Average 2020–2025

    51.9 °F

  • Average High 2020–2025

    62.8 °F
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