Sullivan Lake Weather Forecast

    • 52
    • 64

    Rain Showers

    • 52
    • 62

    Rain Showers

    • 57
    • 73

    Mostly Sunny

    • 57
    • 78

    Mostly Sunny

    • 56
    • 76

    Mostly Sunny

    • 57
    • 76

    Partly Sunny

    • 57
    • 77

    Mostly Sunny

Today 21 Jul Northeast Mountains

Rain Showers likely and a chance of Thunderstorms. Highs in the upper 60s to mid 70s. Chance of precipitation 70 percent. Rainfall Amounts less than a tenth of an Inch, except higher Amounts possible in Thunderstorms.

Tonight 21 Jul Northeast Mountains

Rain Showers likely. A chance of Thunderstorms. Lows in the 50s. Chance of precipitation 70 percent. Rainfall Amounts up to a half inch Possible, except higher Amounts possible in Thunderstorms.

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Sullivan Lake Temperature Statistics

July Temperature

Boundary County Airport (45.4 miles)

  • Lowest 16 July, 2025

    44.6 °F

  • Average July

    69.2 °F

  • Highest 1 July, 2025

    93.2 °F

Climate (2020–Present)

Boundary County Airport (45.4 miles)

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  • Average Low 2020–2025

    37.4 °F

  • Average 2020–2025

    46.9 °F

  • Average High 2020–2025

    56.4 °F
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