Lopez Island - Barnacle Rock Weather Forecast

    • 52
    • 61

    Chance Rain

    • 51
    • 61

    Mostly Sunny

    • 53
    • 67

    Mostly Sunny

    • 51
    • 63

    Partly Sunny

    • 51
    • 61

    Mostly Sunny

    • 51
    • 63

    Mostly Sunny

    • 52
    • 62

    Chance Rain

Today 14 Sep San Juan County

Patchy fog in the morning. Showers in the Morning, then a chance of Showers in the afternoon. Rainfall Amounts less than a tenth of an inch likely. Highs in the mid 60s to lower 70s. Southwest wind 10 to 15 Mph with Gusts to 25 Mph.

Tonight 14 Sep San Juan County

Mostly cloudy. A chance of rain in the evening. A slight chance of rain after midnight. Lows in the upper 40s to mid 50s. Southwest wind 10 to 15 Mph decreasing to 10 Mph or less after midnight.

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Lopez Island - Barnacle Rock Temperature Statistics

September Temperature

Friday Harbor Airport (9.9 miles)

  • Lowest 10 September, 2025

    48 °F

  • Average September

    58 °F

  • Highest 3 September, 2025

    75.9 °F

Climate (2020–Present)

Friday Harbor Airport (9.9 miles)

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  • Average Low 2020–2025

    44.3 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    59.5 °F
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