San Juan Island - Mosquito Bay Weather Forecast

    • 45
    • 61

    Decreasing Clouds

    • 47
    • 62

    Mostly Cloudy

    • 43
    • 61

    Rain Likely

    • 44
    • 58

    Mostly Sunny

    • 43
    • 59

    Mostly Sunny

    • 43
    • 58

    Partly Sunny

Today 7 Oct San Juan County

Partly sunny until late afternoon then becoming sunny. Areas of fog in the morning. Highs in the upper 50s to mid 60s. Light wind.

Tonight 7 Oct San Juan County

Partly cloudy in the evening then becoming mostly cloudy. Lows in the mid 40s to lower 50s. Light wind.

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San Juan Island - Mosquito Bay Temperature Statistics

October Temperature

Friday Harbor Airport (7.5 miles)

  • Lowest 1 October, 2026

    46 °F

  • Average October

    55.5 °F

  • Highest 2 October, 2026

    66 °F

Climate (2021–2026)

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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