Sullivan Lake State Airport Weather Forecast

    • 51
    • 73

    Slight Chance Rain Showers

    • 45
    • 73

    Partly Sunny

    • 48
    • 68

    Mostly Cloudy

    • 45
    • 66

    Slight Chance Rain Showers

    • 43
    • 63

    Slight Chance Rain Showers

    • 45
    • 65

    Partly Sunny

    • 45
    • 67

    Chance Rain Showers

Today 9 Sep Northeast Mountains

Partly cloudy. Highs in the 70s.

Tonight 9 Sep Northeast Mountains

Mostly cloudy. A chance of rain Showers overnight. Lows in the mid 40s to mid 50s. Chance of precipitation 20 percent.

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Sullivan Lake State Airport Temperature Statistics

September Temperature

Boundary County Airport (45.4 miles)

  • Lowest 5 September, 2026

    42.8 °F

  • Average September

    56.6 °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

    37.8 °F

  • Average 2021–2026

    47.3 °F

  • Average High 2021–2026

    56.6 °F
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