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Seattle Weather in September

Averages By Month

September Overview


September marks the transition to fall in Seattle, with mild temperatures. Average temperatures range from 52°F to 70°F (11°C to 21°C). Days begin to shorten, with around 13 hours of daylight, and rain showers become more frequent. September receives an average of 1.5 inches (38 mm) of precipitation. Wind speeds remain moderate, around 7 mph on average. Visitors should pack layers, including a light jacket or sweater, and waterproof clothing. Outdoor activities such as visiting the Museum of History & Industry or exploring the Seattle waterfront are recommended. September also hosts events like Bumbershoot, a music and arts festival featuring local and international artists.


High and Low Temperature in September °F

Water Temperature in September °F

Averages Seattle

  J F M A M J J A S O N D

High °F

45° 50° 54° 57° 64° 70° 73° 73° 68° 61° 52° 46°

Low °F

36° 37° 37° 41° 46° 52° 55° 55° 52° 46° 41° 36°

Sun

2 4 5 7 8 9 10 9 7 5 2 2

Rain days

18 15 16 14 11 9 5 6 9 13 18 19

Water °F

46° 46° 46° 50° 54° 55° 57° 57° 55° 52° 48° 46°


Seattle Weather by Month

Best Time to Visit Seattle

The best time to visit Seattle weather-wise is during the summer months, from June to August, when the temperatures range from 70°F to 80°F (21°C to 27°C). This is the ideal time to enjoy outdoor activities such as hiking, sightseeing, and visiting the city's parks and waterfront. However, summer is also peak tourist season, which means higher prices, crowded attractions, and occasional traffic congestion.

Spring (March to May) and fall (September to November) offer milder temperatures and fewer crowds compared to summer. Spring brings blooming cherry blossoms and the famous Skagit Valley Tulip Festival, while fall offers beautiful foliage and cultural events like the Seattle International Film Festival. However, both seasons also experience more rainfall compared to summer, and there is a possibility of encountering some cloudy days. Winter (December to February) is the coldest and wettest season in Seattle, with temperatures averaging around 40°F (4°C) and frequent rain. While hotel rates are at their lowest and attractions are less crowded, outdoor activities may be limited due to the weather, and there is a chance of encountering storms. However, winter in Seattle also brings festive events like the Seattle Christmas Ship Festival and the Winter Solstice Night Market.

Things to know about Seattle

Seattle, Washington, is a dynamic vacation destination known for its stunning natural beauty, vibrant cultural scene, and thriving culinary scene. With its iconic Space Needle, bustling Pike Place Market, and proximity to both mountains and the sea, Seattle offers something for every type of traveler.

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Seattle Location

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