San Juan Island - Smallpox Bay Weather Forecast

    • 52
    • 77

    Mostly Sunny

    • 50
    • 74

    Mostly Sunny

    • 51
    • 71

    Mostly Sunny

    • 50
    • 72

    Mostly Sunny

    • 51
    • 70

    Chance Rain

    • 50
    • 70

    Chance Rain

Today 16 Sep San Juan County

Sunny. Highs in the 70s to lower 80s. Light wind becoming east to 10 Mph in the afternoon.

Tonight 16 Sep San Juan County

Clear. Areas of smoke in the late evening and early morning. Lows in the 50s. East wind to 10 Mph becoming southeast after midnight.

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San Juan Island - Smallpox Bay Temperature Statistics

September Temperature

Friday Harbor Airport (6.2 miles)

  • Lowest 10 September, 2025

    48 °F

  • Average September

    58 °F

  • Highest 3 September, 2025

    75.9 °F

Climate (2020–Present)

Friday Harbor Airport (6.2 miles)

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  • Average Low 2020–2025

    44.3 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    59.5 °F
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