Charles Island Weather Forecast

    • 57
    • 74

    Mostly Sunny

    • 56
    • 71

    Mostly Sunny

    • 55
    • 69

    Partly Sunny

    • 55
    • 67

    Mostly Cloudy

    • 55
    • 66

    Mostly Cloudy

    • 54
    • 66

    Chance Rain

    • 54
    • 65

    Slight Chance Rain

Today 24 Aug San Juan County

Sunny. Highs in the mid 70s to lower 80s. Light wind.

Tonight 24 Aug San Juan County

Mostly clear. Lows in the mid 50s to lower 60s. Light wind.

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  • Temperature Real-Time

Charles Island Temperature Statistics

August Temperature

Friday Harbor Airport (7.5 miles)

  • Lowest 21 August, 2025

    46.9 °F

  • Average August

    63.3 °F

  • Highest 12 August, 2025

    90.6 °F

Climate (2020–Present)

Friday Harbor Airport (7.5 miles)

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  • Average Low 2020–2025

    44.3 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    59.5 °F
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