Sullivan Lake Weather Forecast

    • 33
    • 46

    Decreasing Clouds

    • 34
    • 48

    Mostly Cloudy

    • 32
    • 47

    Partly Sunny

    • 36
    • 44

    Partly Sunny

    • 35
    • 46

    Mostly Cloudy

    • 37
    • 47

    Partly Sunny

    • 37
    • 47

    Mostly Cloudy

Today 30 Oct Northeast Mountains

Mostly cloudy with a chance of rain and mountain snow Showers. Highs in the upper 40s to lower 50s. Chance of precipitation 50 percent.

Tonight 30 Oct Northeast Mountains

Mostly cloudy. Lows in the lower to mid 30s.

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Sullivan Lake Temperature Statistics

October Temperature

Boundary County Airport (45.4 miles)

  • Lowest 13 October, 2026

    30.2 °F

  • Average October

    47.3 °F

  • Highest 5 October, 2026

    75.2 °F

Climate (2021–2026)

Boundary County Airport (45.4 miles)

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  • Average Low 2021–2026

    37.9 °F

  • Average 2021–2026

    47.4 °F

  • Average High 2021–2026

    56.7 °F
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