Seattle weather in September
Mild and comfortable, with some rainy days. Average highs of 21°C and lows of 13°C, with around 10 rainy days expected throughout the month.
While September isn't our top-rated month for Seattle, it has its own appeal — typically lower prices, fewer crowds, and a more local feel.
Average high
21°C
Average low
13°C
Rainy days
10 days
Best months to visit
July, August
What to do in Seattle in September
Whatever the weather, Seattle rewards curious visitors. Here are some of the best ways to spend your time:
Explore
Dine
Culture
Nature
Shopping
Day trips
What to pack for September
Light layers work well — T-shirts and shorts for the day, a light jacket for evenings. Comfortable walking shoes are a must. Bring a compact umbrella just in case.
Browse other months
January
8C
Cold, with regular rainfall.
February
8C
Cold, with regular rainfall.
March
11C
Cool, with regular rainfall.
April
14C
Cool, with some rainy days.
May
18C
Mild and comfortable, with some rainy days.
June
21C
Mild and comfortable, with occasional showers.
Recommended
July
25C
Warm and pleasant, and mostly sunny skies.
Recommended
August
25C
Warm and pleasant, with occasional showers.
September (you are here)
21C
Mild and comfortable, with some rainy days.
October
15C
Cool, with some rainy days.
November
10C
Cool, with regular rainfall.
December
7C
Cold, with regular rainfall.
Book your September trip to Seattle
Find hotels, tours and experiences for the perfect escape.
