Seattle Weather Forecast

    • 53
    • 66

    Becoming Sunny

    • 54
    • 72

    Mostly Sunny

    • 55
    • 73

    Mostly Sunny

    • 55
    • 73

    Partly Sunny

    • 55
    • 71

    Partly Sunny

    • 55
    • 71

    Partly Sunny

Today 15 Sep City of Seattle

Mostly cloudy with a slight chance of Showers in the Morning, then mostly sunny in the afternoon. Highs in the mid to upper 60s. Light wind becoming north around 10 Mph in the afternoon.

Tonight 15 Sep City of Seattle

Mostly clear. Lows in the lower to mid 50s. North wind around 10 Mph becoming northeast to 10 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Seattle Temperature Statistics

September Temperature

Boeing Field - King County International Airport (3.7 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 (3.7 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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