San Juan Island - Mosquito Bay Weather Forecast

    • 52
    • 74

    Chance Rain Showers

    • 51
    • 73

    Partly Sunny

    • 53
    • 75

    Mostly Sunny

    • 52
    • 78

    Partly Sunny

    • 51
    • 74

    Slight Chance Rain

    • 49
    • 71

    Partly Sunny

Today 22 Aug San Juan County

Partly sunny. A slight chance of Thunderstorms in the late morning and early Afternoon, then a chance of Showers late in the afternoon. Highs in the mid 60s to lower 70s. South wind 10 to 15 Mph.

Tonight 22 Aug San Juan County

Mostly cloudy. A chance of Showers and a slight chance of Thunderstorms in the Evening, then a chance of rain after midnight. Lows in the 50s. Southwest wind 10 to 15 Mph in the evening becoming light.

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  • Temperature Real-Time

San Juan Island - Mosquito Bay Temperature Statistics

August Temperature

Friday Harbor Airport (7.5 miles)

  • Lowest 3 August, 2026

    48.9 °F

  • Average August

    59.8 °F

  • Highest 4 August, 2026

    78.1 °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

    59.6 °F
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