Harbor Island Weather Forecast

    • 58
    • 73

    Increasing Clouds

    • 54
    • 67

    Rain

    • 52
    • 64

    Rain Showers Likely

    • 53
    • 67

    Slight Chance Rain

    • 55
    • 67

    Partly Sunny

    • 56
    • 69

    Chance Rain

Today 1 Sep City of Seattle

Partly sunny. Highs in the upper 60s to mid 70s. South wind to 10 Mph becoming southwest in the afternoon.

Tonight 1 Sep City of Seattle

Partly cloudy in the evening then becoming mostly cloudy. Lows near 60. South wind 10 to 15 Mph.

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Harbor Island Temperature Statistics

September Temperature

Boeing Field - King County International Airport (2.5 miles)

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  • Average September

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Climate (2021–2026)

Boeing Field - King County International Airport (2.5 miles)

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  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    54.2 °F

  • Average High 2021–2026

    61.6 °F
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