San Juan Island - Mosquito Bay Weather Forecast

    • 51
    • 74

    Partly Sunny

    • 51
    • 73

    Partly Sunny

    • 50
    • 73

    Mostly Cloudy

    • 50
    • 70

    Partly Sunny

    • 52
    • 70

    Mostly Sunny

    • 53
    • 73

    Mostly Sunny

Today 8 Jul San Juan County

Partly sunny. Highs in the mid 60s to lower 70s. Southwest wind to 10 Mph becoming south in the afternoon.

Tonight 8 Jul San Juan County

Partly cloudy. Lows in the upper 40s to mid 50s. Southwest wind to 10 Mph with Gusts to 20 Mph.

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San Juan Island - Mosquito Bay Temperature Statistics

July Temperature

Friday Harbor Airport (7.5 miles)

  • Lowest 5 July, 2026

    46.9 °F

  • Average July

    57.5 °F

  • Highest 5 July, 2026

    73.9 °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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