Seattle-Tacoma International Airport Weather Forecast

    • 53
    • 64

    Rain Showers Likely

    • 55
    • 69

    Becoming Sunny

    • 58
    • 83

    Sunny

    • 53
    • 74

    Partly Sunny

    • 54
    • 70

    Mostly Sunny

    • 55
    • 74

    Mostly Sunny

    • 56
    • 73

    Chance Rain

Today 14 Sep Lowlands of Pierce and Southern King Counties

Patchy fog in the morning. Showers likely in the Morning, then mostly cloudy with a chance of Showers in the afternoon. Rainfall Amounts a tenth to a quarter of an inch possible. Highs in the upper 50s to mid 60s. South wind to 10 Mph becoming southwest with Gusts to 25 Mph in the afternoon.

Tonight 14 Sep Lowlands of Pierce and Southern King Counties

Partly cloudy with a chance of rain in the Evening, then partly cloudy with a slight chance of rain late in the evening. Mostly cloudy after midnight. Lows in the upper 40s to mid 50s. Southwest wind 10 to 15 Mph becoming south after midnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Seattle-Tacoma International Airport Temperature Statistics

September Temperature

Seattle, Seattle-Tacoma International Airport (0 miles)

  • Lowest 10 September, 2025

    55.9 °F

  • Average September

    64.7 °F

  • Highest 3 September, 2025

    82 °F

Climate (2020–Present)

Seattle, Seattle-Tacoma International Airport (0 miles)

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

  • Average Low 2020–2025

    46.6 °F

  • Average 2020–2025

    53.3 °F

  • Average High 2020–2025

    61.1 °F
Get WillyWeather+ to remove ads