Brown Island Weather Forecast

    • 40
    • 46

    Rain Showers Likely

    • 41
    • 48

    Chance Rain

    • 42
    • 49

    Rain Likely

    • 44
    • 49

    Rain Likely

    • 46
    • 52

    Chance Rain

    • 43
    • 52

    Slight Chance Rain

Today 8 Jan San Juan County

Mostly sunny in the morning then becoming mostly cloudy. Rain and snow Showers likely in the morning. A chance of rain Showers in the afternoon. No snow accumulation. Highs in the 40s. West wind 10 to 20 Mph becoming southwest in the afternoon.

Tonight 8 Jan San Juan County

Cloudy. A chance of rain Showers in the late evening and early morning. A slight chance of rain Showers in the morning. Lows near 40. Southwest wind to 10 Mph becoming south after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Brown Island Temperature Statistics

January Temperature

Friday Harbor Airport (1.2 miles)

  • Lowest 1 January, 2026

    36 °F

  • Average January

    43.6 °F

  • Highest 3 January, 2026

    51.1 °F

Climate (2021–Present)

Friday Harbor Airport (1.2 miles)

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  • Average Low 2021–2026

    44.4 °F

  • Average 2021–2026

    51.8 °F

  • Average High 2021–2026

    59.6 °F
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