Thatcher Pass Weather Forecast

    • 52
    • 63

    Increasing Clouds

    • 52
    • 61

    Mostly Cloudy

    • 51
    • 62

    Partly Sunny

    • 51
    • 64

    Mostly Sunny

    • 53
    • 67

    Mostly Sunny

    • 53
    • 68

    Partly Sunny

Today 13 Sep San Juan County

Partly sunny in the late morning and early afternoon then becoming sunny. Highs in the 60s. Southwest wind to 10 Mph increasing to south 10 to 20 Mph in the afternoon.

Tonight 13 Sep San Juan County

Mostly clear. Lows in the upper 40s to mid 50s. South wind 10 to 20 Mph becoming southwest 10 to 15 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Thatcher Pass Temperature Statistics

September Temperature

Friday Harbor Airport (9.9 miles)

  • Lowest 3 September, 2026

    48.9 °F

  • Average September

    58.7 °F

  • Highest 6 September, 2026

    73 °F

Climate (2021–2026)

Friday Harbor Airport (9.9 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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