Sullivan Lake State Airport Weather Forecast

    • 51
    • 73

    Partly Sunny

    • 51
    • 75

    Chance Rain

    • 42
    • 59

    Rain Likely

    • 36
    • 56

    Chance Rain

    • 37
    • 56

    Partly Sunny

Today 20 Apr Northeast Mountains

Sunny in the Morning, becoming partly cloudy. Highs in the 70s.

Tonight 20 Apr Northeast Mountains

Partly cloudy. Lows in the mid 40s to lower 50s.

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Sullivan Lake State Airport Temperature Statistics

April Temperature

Boundary County Airport (45.4 miles)

  • Lowest 8 April, 2026

    26.6 °F

  • Average April

    44.7 °F

  • Highest 6 April, 2026

    71.6 °F

Climate (2021–Present)

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

    56.8 °F
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