San Juan Island - Smallpox Bay Weather Forecast

    • 41
    • 56

    Rain

    • 43
    • 62

    Chance Rain

    • 45
    • 65

    Partly Sunny

    • 46
    • 67

    Mostly Cloudy

    • 48
    • 68

    Partly Sunny

    • 48
    • 68

    Partly Sunny

Today 15 May San Juan County

Mostly cloudy. A chance of Showers in the Morning, then Showers and a slight chance of Thunderstorms in the afternoon. Rainfall Amounts less than a tenth of an inch Likely, except higher Amounts possible in Thunderstorms. Highs in the 50s. Southwest wind 10 to 20 Mph becoming south 10 to 15 Mph in the afternoon.

Tonight 15 May San Juan County

Showers likely and a slight chance of Thunderstorms in the Evening, then mostly cloudy with a chance of Showers after midnight. Rainfall Amounts less than a tenth of an inch Likely, except higher Amounts possible in Thunderstorms. Lows in the 40s. Southwest wind 10 to 15 Mph.

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San Juan Island - Smallpox Bay Temperature Statistics

May Temperature

Friday Harbor Airport (6.2 miles)

  • Lowest 11 May, 2026

    43 °F

  • Average May

    56.4 °F

  • Highest 3 May, 2026

    75.9 °F

Climate (2021–Present)

Friday Harbor Airport (6.2 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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