Capitol Hill Weather Forecast

    • 53
    • 72

    Increasing Clouds

    • 53
    • 71

    Partly Sunny

    • 53
    • 71

    Partly Sunny

    • 55
    • 69

    Mostly Cloudy

    • 53
    • 66

    Slight Chance Rain

    • 52
    • 65

    Mostly Cloudy

Today 18 Sep City of Seattle

Sunny. Highs in the upper 60s to mid 70s. South wind to 10 Mph.

Tonight 18 Sep City of Seattle

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

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Capitol Hill Temperature Statistics

September Temperature

Boeing Field - King County International Airport (5 miles)

  • Lowest 5 September, 2026

    53.1 °F

  • Average September

    62.3 °F

  • Highest 9 September, 2026

    78.1 °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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