Capitol Hill Weather Forecast

    • 54
    • 69

    Increasing Clouds

    • 53
    • 68

    Mostly Cloudy

    • 52
    • 66

    Mostly Cloudy

    • 52
    • 62

    Rain Likely

    • 49
    • 62

    Chance Rain

    • 49
    • 62

    Mostly Cloudy

Today 21 Sep City of Seattle

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

Tonight 21 Sep City of Seattle

Mostly clear in the evening then becoming mostly cloudy. Lows in the mid to upper 50s. Light wind.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Capitol Hill Temperature Statistics

September Temperature

Boeing Field - King County International Airport (5 miles)

  • Lowest 19 September, 2026

    52 °F

  • Average September

    62.3 °F

  • Highest 9 September, 2026

    78.1 °F

Climate (2021–2026)

Boeing Field - King County International Airport (5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    47.2 °F

  • Average 2021–2026

    54.2 °F

  • Average High 2021–2026

    61.6 °F
Get WillyWeather+ to remove ads