Capitol Hill Weather Forecast

    • 56
    • 72

    Increasing Clouds

    • 55
    • 69

    Mostly Cloudy

    • 55
    • 71

    Mostly Sunny

    • 56
    • 75

    Mostly Sunny

    • 56
    • 74

    Partly Sunny

    • 56
    • 71

    Partly Sunny

Today 6 Sep City of Seattle

Mostly sunny. Highs in the upper 60s to mid 70s. Light wind becoming north around 10 Mph in the afternoon.

Tonight 6 Sep City of Seattle

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

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Capitol Hill Temperature Statistics

September Temperature

Boeing Field - King County International Airport (5 miles)

  • Lowest 4 September, 2026

    54 °F

  • Average September

    61.4 °F

  • Highest 2 September, 2026

    71.1 °F

Climate (2021–2026)

Boeing Field - King County International Airport (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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