Turn Island Weather Forecast

    • 49
    • 65

    Increasing Clouds

    • 48
    • 66

    Slight Chance Rain

    • 49
    • 68

    Mostly Sunny

    • 48
    • 68

    Mostly Sunny

    • 49
    • 67

    Partly Sunny

    • 48
    • 66

    Partly Sunny

    • 48
    • 67

    Partly Sunny

Today 14 Sep San Juan County

Partly sunny. Highs in the 60s. South wind 10 to 15 Mph.

Tonight 14 Sep San Juan County

Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 40s to mid 50s. South wind to 10 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Turn Island Temperature Statistics

September Temperature

Friday Harbor Airport (2.5 miles)

  • Lowest 3 September, 2026

    48.9 °F

  • Average September

    58.6 °F

  • Highest 6 September, 2026

    73 °F

Climate (2021–2026)

Friday Harbor Airport (2.5 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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