Decatur Island - Davis Bay Weather Forecast

    • 54
    • 62

    Increasing Clouds

    • 52
    • 60

    Partly Sunny

    • 52
    • 59

    Chance Rain

    • 52
    • 62

    Partly Sunny

    • 52
    • 65

    Partly Sunny

    • 52
    • 63

    Partly Sunny

    • 52
    • 65

    Partly Sunny

Today 9 Sep San Juan County

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

Tonight 9 Sep San Juan County

Mostly cloudy in the evening then becoming partly cloudy. Lows in the 50s. Light wind becoming southwest 10 to 15 Mph after midnight.

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Decatur Island - Davis Bay Temperature Statistics

September Temperature

Friday Harbor Airport (9.9 miles)

  • Lowest 3 September, 2026

    48.9 °F

  • Average September

    58.4 °F

  • Highest 6 September, 2026

    73 °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

    59.6 °F
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