Grand Coulee Weather Forecast

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    • 43

    Rain Likely

    • 38
    • 46

    Chance Rain

    • 37
    • 46

    Mostly Cloudy

    • 39
    • 47

    Mostly Cloudy

    • 37
    • 47

    Mostly Cloudy

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    • 49

    Mostly Cloudy

Today 29 Jan Upper Columbia Basin

Cloudy. Rain likely and a chance of freezing rain in the Morning, then a chance of rain in the afternoon. Highs in the upper 30s to lower 40s. Southeast wind 5 to 10 Mph. Chance of precipitation 70 percent.

Tonight 29 Jan Upper Columbia Basin

Cloudy. A chance of rain. Lows in the lower to mid 30s. East wind 5 to 10 Mph. Chance of precipitation 50 percent. Rainfall Amounts less than a tenth of an inch.

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  • Temperature Forecast NOAA

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Grand Coulee Temperature Statistics

January Temperature

Omak Airport (42.9 miles)

  • Lowest 25 January, 2026

    17.1 °F

  • Average January

    32.8 °F

  • Highest 15 January, 2026

    49.6 °F

Climate (2021–Present)

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

    62.9 °F
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