Decatur Island - Davis Bay Weather Forecast

    • 51
    • 57

    Mostly Cloudy

    • 51
    • 57

    Rain

    • 50
    • 57

    Rain Showers

    • 50
    • 58

    Mostly Cloudy

    • 49
    • 60

    Partly Sunny

    • 51
    • 61

    Chance Rain

    • 51
    • 62

    Chance Rain

Today 23 Sep San Juan County

Partly sunny. A slight chance of rain in the morning. Highs in the lower to mid 60s.

Tonight 23 Sep San Juan County

Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 40s to mid 50s. West wind to 10 Mph in the evening becoming light.

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Decatur Island - Davis Bay Temperature Statistics

September Temperature

Friday Harbor Airport (9.9 miles)

  • Lowest 21 September, 2026

    46 °F

  • Average September

    57.9 °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

    59.7 °F
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