Decatur Island - Davis Bay Weather Forecast

    • 46
    • 54

    Mostly Cloudy

    • 47
    • 56

    Mostly Cloudy

    • 44
    • 56

    Partly Sunny

    • 42
    • 51

    Mostly Sunny

    • 43
    • 52

    Mostly Sunny

    • 44
    • 53

    Mostly Sunny

Today 4 Apr San Juan County

Mostly sunny. Highs in the 50s. Light wind.

Tonight 4 Apr San Juan County

Partly cloudy in the evening then becoming mostly cloudy. Lows in the 40s. Light wind.

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Decatur Island - Davis Bay Temperature Statistics

April Temperature

Friday Harbor Airport (9.9 miles)

  • Lowest 1 April, 2026

    41 °F

  • Average April

    46.5 °F

  • Highest 2 April, 2026

    57.9 °F

Climate (2021–Present)

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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