San Juan Island - Friday Harbor Weather Forecast

    • 47
    • 64

    Increasing Clouds

    • 47
    • 64

    Becoming Sunny

    • 50
    • 66

    Mostly Sunny

    • 54
    • 71

    Mostly Sunny

    • 55
    • 76

    Partly Sunny

    • 51
    • 68

    Chance Rain

    • 50
    • 67

    Partly Sunny

Today 29 May San Juan County

Mostly cloudy until late afternoon then becoming mostly sunny. Highs in the 60s. Southwest wind 10 to 20 Mph with Gusts to 35 Mph.

Tonight 29 May San Juan County

Breezy. Mostly clear until early morning then becoming mostly cloudy. Lows in the mid 40s to lower 50s. Southwest wind 15 to 25 Mph becoming west 10 to 20 Mph after midnight. Gusts to 35 Mph.

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San Juan Island - Friday Harbor Temperature Statistics

May Temperature

Friday Harbor Airport (1.9 miles)

  • Lowest 17 May, 2026

    41 °F

  • Average May

    55 °F

  • Highest 3 May, 2026

    75.9 °F

Climate (2021–Present)

Friday Harbor Airport (1.9 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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