San Juan Island - Kanaka Bay Weather Forecast

    • 50
    • 62

    Mostly Cloudy

    • 51
    • 67

    Mostly Cloudy

    • 51
    • 68

    Chance Rain

    • 49
    • 67

    Rain Likely

    • 49
    • 64

    Chance Rain

    • 49
    • 64

    Slight Chance Rain

    • 49
    • 65

    Partly Sunny

Today 30 Aug San Juan County

Mostly cloudy. A slight chance of Showers late in the morning. Highs in the 60s. South wind 10 to 15 Mph.

Tonight 30 Aug San Juan County

Mostly cloudy then becoming partly cloudy after midnight then becoming mostly cloudy. Lows in the upper 40s to mid 50s. South wind to 10 Mph in the evening becoming light.

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  • Temperature Real-Time

San Juan Island - Kanaka Bay Temperature Statistics

August Temperature

Friday Harbor Airport (3.1 miles)

  • Lowest 3 August, 2026

    48.9 °F

  • Average August

    60.5 °F

  • Highest 25 August, 2026

    79 °F

Climate (2021–2026)

Friday Harbor Airport (3.1 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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