Sullivan Lake Weather Forecast

    • 41
    • 55

    Rain Likely

    • 41
    • 67

    Mostly Sunny

    • 45
    • 73

    Mostly Sunny

    • 50
    • 71

    Mostly Sunny

    • 50
    • 69

    Mostly Sunny

    • 50
    • 71

    Mostly Sunny

    • 50
    • 71

    Partly Sunny

Today 15 Sep Northeast Mountains

Cloudy with a 50 percent chance of rain. Highs in the lower to mid 60s. Rainfall Amounts less than a tenth of an inch.

Tonight 15 Sep Northeast Mountains

Mostly cloudy. A chance of rain. Lows in the lower to mid 40s. Chance of precipitation 50 percent. Rainfall Amounts less than a tenth of an inch.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Sullivan Lake Temperature Statistics

September Temperature

Boundary County Airport (45.4 miles)

  • Lowest 5 September, 2026

    42.8 °F

  • Average September

    57.7 °F

  • Highest 1 September, 2026

    78.8 °F

Climate (2021–2026)

Boundary County Airport (45.4 miles)

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  • Average Low 2021–2026

    37.9 °F

  • Average 2021–2026

    47.3 °F

  • Average High 2021–2026

    56.6 °F
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