San Juan Island - Point Joe Weather Forecast

    • 50
    • 64

    Mostly Sunny

    • 49
    • 63

    Mostly Sunny

    • 51
    • 62

    Rain

    • 49
    • 63

    Chance Rain

    • 50
    • 61

    Chance Rain

    • 51
    • 63

    Chance Rain

Today 18 Sep San Juan County

Sunny. Highs in the mid 60s to lower 70s. Northwest wind to 10 Mph.

Tonight 18 Sep San Juan County

Clear. Lows in the upper 40s to mid 50s. Light wind.

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San Juan Island - Point Joe Temperature Statistics

September Temperature

Friday Harbor Airport (3.7 miles)

  • Lowest 10 September, 2025

    48 °F

  • Average September

    58.5 °F

  • Highest 16 September, 2025

    80.1 °F

Climate (2020–Present)

Friday Harbor Airport (3.7 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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