Spieden Island Weather Forecast

    • 50
    • 59

    Increasing Clouds

    • 53
    • 60

    Rain

    • 51
    • 61

    Rain

    • 51
    • 59

    Mostly Cloudy

    • 51
    • 59

    Mostly Cloudy

    • 51
    • 59

    Partly Sunny

Today 27 Sep San Juan County

Mostly sunny. Highs in the upper 50s to mid 60s. North wind 10 to 15 Mph.

Tonight 27 Sep San Juan County

Mostly clear. Lows in the mid 40s to lower 50s. Southwest wind to 10 Mph becoming west after midnight.

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Spieden Island Temperature Statistics

September Temperature

Friday Harbor Airport (9.3 miles)

  • Lowest 21 September, 2026

    46 °F

  • Average September

    57.2 °F

  • Highest 6 September, 2026

    73 °F

Climate (2021–2026)

Friday Harbor Airport (9.3 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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