Capitol Hill Weather Forecast

    • 52
    • 66

    Chance Rain Showers

    • 53
    • 68

    Partly Sunny

    • 53
    • 69

    Mostly Cloudy

    • 55
    • 72

    Partly Sunny

    • 56
    • 72

    Partly Sunny

    • 55
    • 70

    Partly Sunny

Today 3 Sep City of Seattle

Mostly cloudy. A chance of Showers in the Morning, then Showers likely late in the morning. A chance of Showers and a slight chance of Thunderstorms in the afternoon. Rainfall Amounts less than a tenth of an inch Likely, except higher Amounts possible in Thunderstorms. Highs in the 60s. Southeast wind to 10 Mph becoming southwest in the afternoon.

Tonight 3 Sep City of Seattle

Mostly cloudy in the evening then becoming partly cloudy. Lows in the lower to mid 50s. Light wind.

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Capitol Hill Temperature Statistics

September Temperature

Boeing Field - King County International Airport (5 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 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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