Friday Harbor Weather Forecast

    • 48
    • 64

    Increasing Clouds

    • 48
    • 67

    Partly Sunny

    • 49
    • 67

    Partly Sunny

    • 50
    • 68

    Partly Sunny

    • 50
    • 69

    Partly Sunny

    • 51
    • 69

    Partly Sunny

Today 17 May San Juan County

Sunny. Highs in the 60s. Light wind.

Tonight 17 May San Juan County

Mostly cloudy. Lows in the mid 40s to lower 50s. South wind to 10 Mph becoming southwest after midnight.

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  • Temperature Real-Time

Friday Harbor Temperature Statistics

May Temperature

Friday Harbor Airport (0.6 miles)

  • Lowest 11 May, 2026

    43 °F

  • Average May

    56.1 °F

  • Highest 3 May, 2026

    75.9 °F

Climate (2021–Present)

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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