Brown Island Weather Forecast

    • 50
    • 65

    Chance Rain

    • 46
    • 65

    Rain

    • 47
    • 65

    Mostly Sunny

    • 49
    • 68

    Partly Sunny

    • 49
    • 69

    Partly Sunny

    • 46
    • 66

    Partly Sunny

Today 24 May San Juan County

Mostly sunny. Highs in the 60s. Southwest wind to 10 Mph becoming south in the Afternoon, Gusts to 20 Mph in the morning.

Tonight 24 May San Juan County

Mostly cloudy. A slight chance of rain in the morning. Lows near 50. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Brown Island Temperature Statistics

May Temperature

Friday Harbor Airport (1.2 miles)

  • Lowest 17 May, 2026

    41 °F

  • Average May

    55 °F

  • Highest 3 May, 2026

    75.9 °F

Climate (2021–Present)

Friday Harbor Airport (1.2 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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