Duwamish Waterway Weather Forecast

    • 55
    • 70

    Mostly Sunny

    • 59
    • 85

    Sunny

    • 56
    • 76

    Mostly Sunny

    • 57
    • 71

    Partly Sunny

    • 58
    • 74

    Partly Sunny

    • 58
    • 75

    Chance Rain

Today 15 Sep City of Seattle

Sunny. Highs in the mid 60s to lower 70s. Light wind becoming north to 10 Mph in the afternoon.

Tonight 15 Sep City of Seattle

Mostly clear. Lows in the mid 50s. North wind around 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Duwamish Waterway Temperature Statistics

September Temperature

Boeing Field - King County International Airport (0.6 miles)

  • Lowest 11 September, 2025

    57 °F

  • Average September

    66 °F

  • Highest 3 September, 2025

    81 °F

Climate (2020–Present)

Boeing Field - King County International Airport (0.6 miles)

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  • Average Low 2020–2025

    47 °F

  • Average 2020–2025

    54 °F

  • Average High 2020–2025

    61.4 °F
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