Brown Island Weather Forecast

    • 53
    • 71

    Increasing Clouds

    • 53
    • 72

    Mostly Cloudy

    • 52
    • 71

    Mostly Cloudy

    • 51
    • 71

    Mostly Sunny

    • 53
    • 74

    Mostly Sunny

    • 53
    • 75

    Sunny

Today 17 Aug San Juan County

Partly sunny. A slight chance of rain in the morning. Patchy fog in the morning. Highs in the upper 60s to mid 70s. Light wind.

Tonight 17 Aug San Juan County

Mostly cloudy. Lows in the 50s. Light wind.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Brown Island Temperature Statistics

August Temperature

Friday Harbor Airport (1.2 miles)

  • Lowest 8 August, 2025

    47.6 °F

  • Average August

    63.2 °F

  • Highest 12 August, 2025

    90.6 °F

Climate (2020–Present)

Friday Harbor Airport (1.2 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    44.3 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    59.5 °F
Get WillyWeather+ to remove ads