San Juan Island - Mosquito Bay Weather Forecast

    • 50
    • 71

    Increasing Clouds

    • 47
    • 71

    Mostly Cloudy

    • 49
    • 68

    Rain

    • 46
    • 66

    Rain

    • 48
    • 65

    Partly Sunny

    • 49
    • 69

    Partly Sunny

    • 49
    • 67

    Partly Sunny

Today 22 May San Juan County

Mostly sunny in the morning then becoming sunny. Highs in the mid 60s to lower 70s. Light wind.

Tonight 22 May San Juan County

Partly cloudy in the evening then becoming mostly cloudy. Lows near 50. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

San Juan Island - Mosquito Bay Temperature Statistics

May Temperature

Friday Harbor Airport (7.5 miles)

  • Lowest 17 May, 2026

    41 °F

  • Average May

    54.9 °F

  • Highest 3 May, 2026

    75.9 °F

Climate (2021–Present)

Friday Harbor Airport (7.5 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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