Friday Harbor Weather Forecast

    • 51
    • 68

    Mostly Sunny

    • 52
    • 70

    Mostly Cloudy

    • 50
    • 68

    Partly Sunny

    • 50
    • 65

    Chance Rain

    • 50
    • 67

    Partly Sunny

    • 50
    • 67

    Partly Sunny

Today 8 Sep San Juan County

Mostly sunny. Highs in the 60s to lower 70s. Light wind.

Tonight 8 Sep San Juan County

Mostly clear. Lows in the upper 40s to mid 50s. Light wind.

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Friday Harbor Temperature Statistics

September Temperature

Friday Harbor Airport (0.6 miles)

  • Lowest 3 September, 2026

    48.9 °F

  • Average September

    58.4 °F

  • Highest 6 September, 2026

    73 °F

Climate (2021–2026)

Friday Harbor Airport (0.6 miles)

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  • Average Low 2021–2026

    44.5 °F

  • Average 2021–2026

    51.9 °F

  • Average High 2021–2026

    59.7 °F
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