San Juan Island - Mosquito Bay Weather Forecast

    • 39
    • 60

    Partly Sunny

    • 39
    • 52

    Mostly Sunny

    • 40
    • 53

    Mostly Sunny

    • 41
    • 56

    Mostly Sunny

    • 42
    • 56

    Partly Sunny

    • 42
    • 55

    Partly Sunny

Today 6 Apr San Juan County

Mostly sunny. Highs near 60. Light wind becoming south 10 to 15 Mph with Gusts to 25 Mph in the afternoon.

Tonight 6 Apr San Juan County

Partly cloudy. Lows in the upper 30s to mid 40s. West wind 10 to 20 Mph with Gusts to 30 Mph.

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  • Temperature Real-Time

San Juan Island - Mosquito Bay Temperature Statistics

April Temperature

Friday Harbor Airport (7.5 miles)

  • Lowest 1 April, 2026

    41 °F

  • Average April

    47.3 °F

  • Highest 2 April, 2026

    57.9 °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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