Decatur Island - Davis Bay Weather Forecast

    • 54
    • 63

    Increasing Clouds

    • 53
    • 65

    Mostly Cloudy

    • 51
    • 61

    Slight Chance Rain

    • 51
    • 61

    Partly Sunny

    • 51
    • 63

    Mostly Cloudy

    • 52
    • 64

    Chance Rain

    • 51
    • 64

    Chance Rain

Today 26 Aug San Juan County

Mostly sunny. Highs in the mid 60s to lower 70s. South wind to 10 Mph.

Tonight 26 Aug San Juan County

Mostly clear in the evening then becoming mostly cloudy. Lows in the 50s. South wind to 10 Mph in the evening becoming light.

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Decatur Island - Davis Bay Temperature Statistics

August Temperature

Friday Harbor Airport (9.9 miles)

  • Lowest 3 August, 2026

    48.9 °F

  • Average August

    60.2 °F

  • Highest 4 August, 2026

    78.1 °F

Climate (2021–2026)

Friday Harbor Airport (9.9 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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