Little Sullivan Lake Weather Forecast

    • 16
    • 35

    Mostly Sunny

    • 19
    • 35

    Mostly Sunny

    • 29
    • 36

    Mostly Cloudy

    • 30
    • 38

    Rain/Snow

    • 23
    • 37

    Slight Chance Snow

    • 21
    • 33

    Chance Snow

    • 21
    • 32

    Chance Snow

Today 28 Jan Upper Columbia Basin

Sunny. Highs in the lower to mid 30s. East wind 5 to 10 Mph.

Tonight 28 Jan Upper Columbia Basin

Mostly clear. Lows 15 to 19. Light wind.

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Little Sullivan Lake Temperature Statistics

January Temperature

Grant County Airport (27.3 miles)

  • Lowest 22 January, 2025

    14.8 °F

  • Average January

    32.1 °F

  • Highest 11 January, 2025

    47.6 °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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