San Juan Island - Friday Harbor Weather Forecast

    • 46
    • 56

    Gradual Clearing

    • 47
    • 58

    Partly Sunny

    • 49
    • 62

    Mostly Cloudy

    • 44
    • 57

    Partly Sunny

    • 45
    • 54

    Mostly Cloudy

    • 45
    • 54

    Chance Rain

Today 14 Oct San Juan County

Mostly cloudy. A chance of rain in the morning. Highs in the mid 50s to lower 60s. Southeast wind to 10 Mph in the morning becoming light.

Tonight 14 Oct San Juan County

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

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San Juan Island - Friday Harbor Temperature Statistics

October Temperature

Friday Harbor Airport (1.9 miles)

  • Lowest 7 October, 2026

    44.1 °F

  • Average October

    53.8 °F

  • Highest 2 October, 2026

    66 °F

Climate (2021–2026)

Friday Harbor Airport (1.9 miles)

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  • Average Low 2021–2026

    44.5 °F

  • Average 2021–2026

    52 °F

  • Average High 2021–2026

    59.7 °F
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