Capitol Hill Weather Forecast

    • 54
    • 69

    Rain

    • 55
    • 65

    Rain

    • 54
    • 69

    Mostly Cloudy

    • 53
    • 69

    Mostly Sunny

    • 54
    • 73

    Mostly Sunny

    • 55
    • 75

    Mostly Sunny

    • 56
    • 77

    Mostly Sunny

Today 12 Sep City of Seattle

Mostly cloudy. Highs in the mid 60s to lower 70s. Light wind becoming northwest around 10 Mph in the afternoon.

Tonight 12 Sep City of Seattle

A slight chance of rain in the Evening, then rain likely in the late evening and early morning. Rain late in the night. Rainfall Amounts a quarter to a half inch possible. Lows in the mid 50s. Light wind becoming south around 10 Mph after midnight.

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Capitol Hill Temperature Statistics

September Temperature

Boeing Field - King County International Airport (5 miles)

  • Lowest 5 September, 2026

    53.1 °F

  • Average September

    63.1 °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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