Decatur Island - Decatur Head Weather Forecast

    • 48
    • 58

    Sunny

    • 49
    • 56

    Mostly Cloudy

    • 48
    • 55

    Partly Sunny

    • 49
    • 58

    Partly Sunny

    • 49
    • 59

    Partly Sunny

    • 50
    • 58

    Partly Sunny

Today 26 Apr San Juan County

Sunny. Highs near 60. Light wind.

Tonight 26 Apr San Juan County

Mostly clear. Lows in the 40s. Light wind.

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Decatur Island - Decatur Head Temperature Statistics

April Temperature

Friday Harbor Airport (10.6 miles)

  • Lowest 15 April, 2026

    33.1 °F

  • Average April

    48.2 °F

  • Highest 19 April, 2026

    66 °F

Climate (2021–Present)

Friday Harbor Airport (10.6 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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