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  1. www.accuweather.com › en › usSeattle, WA Monthly Weather | AccuWeather

    Get the monthly weather forecast for Seattle, WA, including daily high/low, historical averages, to help you plan ahead.

    • August

      Get the monthly weather forecast for Seattle, WA, including...

  2. www.thefamilyvacationguide.com › washington › seattle-weatherSeattle Weather in September: What To Expect on Your Vacation

    Jul 18, 2022 · The weather in Seattle in September is beautiful. Temperatures stay in the 50s, and high 60s throughout the month, sometimes pushing into the low 70s. You’ll be able to wander downtown without getting poured on, experience warmth from the sunshine, and enjoy all the outdoor activities you want.

  3. weatherspark.com › m › 913September Weather in Seattle Washington, United States

    In Seattle during September average daily high temperatures decrease from 75°F to 67°F and the fraction of time spent overcast or mostly cloudy increases from 35% to 45%.

  4. www.weather-atlas.com › seattle-weather-septemberSeptember weather - Autumn 2024 - Seattle, WA

    Jul 31, 2024 · Seattle experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a warm 76.3°F (24.6°C) in August to a pleasant 69.6°F (20.9°C). During September, Seattle records an average temperature of 50.5°F (10.3°C) at night.

  5. www.currentresults.com › seattle-weather-in-septemberSeattle WA Weather in September - Current Results

    This page gives detailed information on Seattle's usual September temperature, precipitation, sun, humidity, wind and storms for Seattle. The weather measurements are averages based on climate data gathered at Seattle — Tacoma International Airport, located south of the city center.

  6. weather.com › weather › monthlyMonthly Weather Forecast for Seattle, WA - weather.com

    Weather.com brings you the most accurate monthly weather forecast for Seattle, WA with average/record and high/low temperatures, precipitation and more.

  7. weather-and-climate.com › seattle-September-averagesSeattle (WA) Weather in September: Temperature, Rainfall, & More

    Experience perfect weather in Seattle in September, characterized by pleasant temperatures and moderate rainfall. The month of September belongs to the summer season. Anticipate daytime temperatures around 22°C, while night temperatures can drop to 12°C.