Armitage Island Weather Forecast

    • 52
    • 63

    Gradual Clearing

    • 52
    • 64

    Partly Sunny

    • 52
    • 62

    Partly Sunny

    • 52
    • 63

    Partly Sunny

    • 53
    • 66

    Partly Sunny

    • 53
    • 66

    Mostly Cloudy

Today 5 Sep San Juan County

Mostly cloudy with a slight chance of rain in the Morning, then mostly sunny in the afternoon. Highs in the 60s. North wind to 10 Mph in the morning becoming light.

Tonight 5 Sep San Juan County

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

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Armitage Island Temperature Statistics

September Temperature

Friday Harbor Airport (10.6 miles)

  • Lowest 3 September, 2026

    48.9 °F

  • Average September

    58.3 °F

  • Highest 3 September, 2026

    66.9 °F

Climate (2021–2026)

Friday Harbor Airport (10.6 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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