San Juan Island - Kansas Cove Weather Forecast

    • 52
    • 71

    Increasing Clouds

    • 52
    • 70

    Mostly Cloudy

    • 52
    • 71

    Partly Sunny

    • 51
    • 70

    Partly Sunny

    • 52
    • 69

    Partly Sunny

    • 52
    • 71

    Partly Sunny

Today 15 Aug San Juan County

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

Tonight 15 Aug San Juan County

Partly cloudy in the evening then becoming mostly cloudy. Lows in the 50s. Light wind.

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San Juan Island - Kansas Cove Temperature Statistics

August Temperature

Friday Harbor Airport (1.9 miles)

  • Lowest 3 August, 2026

    48.9 °F

  • Average August

    60.9 °F

  • Highest 4 August, 2026

    78.1 °F

Climate (2021–2026)

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

    59.6 °F
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