Capitol Hill Weather Forecast

    • 53
    • 71

    Becoming Sunny

    • 53
    • 71

    Partly Sunny

    • 54
    • 70

    Partly Sunny

    • 53
    • 68

    Mostly Cloudy

    • 53
    • 67

    Mostly Cloudy

    • 52
    • 64

    Slight Chance Rain

Today 19 Sep City of Seattle

Mostly cloudy in the morning then becoming mostly sunny. Areas of fog in the morning. Highs in the mid 60s to lower 70s. Light wind.

Tonight 19 Sep City of Seattle

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

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  • 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

    62.6 °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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