San Juan Co Park Weather Forecast

    • 49
    • 66

    Becoming Sunny

    • 49
    • 68

    Mostly Sunny

    • 49
    • 69

    Mostly Sunny

    • 49
    • 68

    Partly Sunny

    • 48
    • 67

    Partly Sunny

    • 48
    • 68

    Partly Sunny

Today 15 Sep San Juan County

Patchy fog in the morning. Mostly cloudy with a slight chance of rain in the Morning, then sunny in the afternoon. Highs in the 60s. Light wind becoming north to 10 Mph in the afternoon.

Tonight 15 Sep San Juan County

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

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San Juan Co Park Temperature Statistics

September Temperature

Friday Harbor Airport (6.2 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 (6.2 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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