Downtown Seattle Weather Forecast

    • 55
    • 70

    Rain

    • 56
    • 67

    Rain

    • 54
    • 69

    Mostly Cloudy

    • 54
    • 70

    Mostly Sunny

    • 56
    • 74

    Mostly Sunny

    • 56
    • 76

    Mostly Sunny

Today 12 Sep City of Seattle

Cloudy. A slight chance of rain late in the afternoon. Highs near 70. Light wind becoming northwest to 10 Mph in the afternoon.

Tonight 12 Sep City of Seattle

Cloudy with a chance of rain until early Morning, then cloudy with rain in the morning. Rainfall Amounts a quarter to a half inch possible. Lows in the mid to upper 50s. Southwest wind to 10 Mph becoming south after midnight.

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Downtown Seattle Temperature Statistics

September Temperature

Boeing Field - King County International Airport (4.3 miles)

  • Lowest 5 September, 2026

    53.1 °F

  • Average September

    62.8 °F

  • Highest 9 September, 2026

    78.1 °F

Climate (2021–2026)

Boeing Field - King County International Airport (4.3 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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