Little Sullivan Lake Weather Forecast

    • 22
    • 41

    Rain/Snow Likely

    • 17
    • 30

    Partly Sunny

    • 18
    • 30

    Partly Sunny

    • 22
    • 32

    Mostly Cloudy

    • 23
    • 36

    Mostly Cloudy

    • 27
    • 37

    Slight Chance Rain/Snow

Today 26 Dec Upper Columbia Basin

Mostly cloudy. Patchy dense fog in the morning. Rain or snow likely. Little or no snow accumulation. Highs in the upper 30s to lower 40s. Breezy. South wind 10 to 20 Mph. Gusts up to 20 Mph increasing to 30 Mph in the afternoon. Chance of precipitation 70 percent.

Tonight 26 Dec Upper Columbia Basin

Mostly cloudy. A chance of rain or snow in the Evening, then a chance of snow overnight. Lows in the 20s. Breezy. Southwest wind 10 to 20 Mph with Gusts up to 30 Mph. Chance of precipitation 50 percent.

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Little Sullivan Lake Temperature Statistics

December Temperature

Grant County Airport (27.3 miles)

  • Lowest 1 December, 2025

    25 °F

  • Average December

    40.8 °F

  • Highest 15 December, 2025

    64 °F

Climate (2020–Present)

Grant County Airport (27.3 miles)

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  • Average Low 2020–2025

    41.1 °F

  • Average 2020–2025

    52.9 °F

  • Average High 2020–2025

    64.3 °F
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