Westlake Weather Forecast

    • 53
    • 69

    Mostly Cloudy

    • 53
    • 70

    Mostly Cloudy

    • 55
    • 71

    Slight Chance Rain

    • 56
    • 71

    Slight Chance Rain

    • 55
    • 70

    Partly Sunny

    • 56
    • 73

    Partly Sunny

Today 4 Sep City of Seattle

Partly sunny. A slight chance of rain late in the afternoon. Highs in the mid 60s to lower 70s. Light wind.

Tonight 4 Sep City of Seattle

Mostly cloudy. Lows in the lower to mid 50s. Light wind.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Westlake Temperature Statistics

September Temperature

Boeing Field - King County International Airport (5.6 miles)

  • Lowest 1 September, 2026

    57.9 °F

  • Average September

    63.2 °F

  • Highest 1 September, 2026

    69.1 °F

Climate (2021–2026)

Boeing Field - King County International Airport (5.6 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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