Little Sullivan Lake Weather Forecast

    • 38
    • 62

    Increasing Clouds

    • 39
    • 68

    Partly Sunny

    • 42
    • 72

    Partly Sunny

    • 44
    • 74

    Partly Sunny

    • 47
    • 76

    Partly Sunny

    • 48
    • 79

    Partly Sunny

Today 16 May Upper Columbia Basin

Partly cloudy with a chance of rain Showers in the Morning, then mostly cloudy with a chance of rain Showers in the afternoon. Highs in the upper 50s to lower 60s. Breezy. West wind 10 to 20 Mph with Gusts up to 30 Mph. Chance of precipitation 50 percent. Rainfall Amounts less than a tenth of an inch.

Tonight 16 May Upper Columbia Basin

Partly cloudy. Lows in the upper 30s to lower 40s. West wind 5 to 15 Mph with Gusts up to 35 Mph.

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Little Sullivan Lake Temperature Statistics

May Temperature

Grant County Airport (27.3 miles)

  • Lowest 1 May, 2026

    38.6 °F

  • Average May

    65 °F

  • Highest 4 May, 2026

    89.7 °F

Climate (2021–Present)

Grant County Airport (27.3 miles)

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  • Average Low 2021–2026

    41 °F

  • Average 2021–2026

    52.8 °F

  • Average High 2021–2026

    64.3 °F
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