Decatur Island - Davis Bay Weather Forecast

    • 41
    • 48

    Chance Rain

    • 40
    • 48

    Chance Rain

    • 43
    • 48

    Rain

    • 43
    • 51

    Rain

    • 40
    • 50

    Rain Likely

    • 40
    • 49

    Slight Chance Rain

Today 21 Mar San Juan County

Sunny. Highs in the mid 40s to lower 50s. West wind to 10 Mph.

Tonight 21 Mar San Juan County

Mostly clear with a slight chance of rain in the Evening, then mostly cloudy with a chance of rain after midnight. Lows near 40. Southwest wind around 10 Mph becoming south after midnight.

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Decatur Island - Davis Bay Temperature Statistics

March Temperature

Friday Harbor Airport (9.9 miles)

  • Lowest 10 March, 2026

    30 °F

  • Average March

    44.2 °F

  • Highest 18 March, 2026

    55.9 °F

Climate (2021–Present)

Friday Harbor Airport (9.9 miles)

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  • Average Low 2021–2026

    44.4 °F

  • Average 2021–2026

    51.9 °F

  • Average High 2021–2026

    59.6 °F
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