Seattle weather in September
September in Seattle averages 71°F by day and 53°F at night, with 1.7 inches of precipitation. It is the 3rd-warmest and 9th-wettest month of the year here.
- Average high
- 71°F-6° vs August
- Average low
- 53°F0 nights below freezing
- Precipitation
- 1.7 in5 days with 0.1 in. or more
- Snow
- 0.0 in0 days at 90°F+
Is September a good time to visit Seattle?
Yes. September is one of the most comfortable months in Seattle by our rule (highs of 62 to 86°F, lows of 42°F or more and under 4.5 inches of precipitation). The most comfortable months overall are May to September.
Get outside in Seattle in September
September is made for being outside. Try Space Needle, Pike Place Market, Seattle Center, Woodland Park Zoo. All things to do in Seattle.
On September 15 the sun rises at 6:47 am and sets at 7:20 pm, giving 12h 34m of daylight. Daylight all year.
What to pack for Seattle in September
- T-shirts and a light jacket or sweater
Based on 30-year averages, not a forecast. Check the forecast a few days before you go.
September nearby
| City | Distance | High | Low | Precip. |
|---|---|---|---|---|
| Seattle | 71°F | 53°F | 1.7 in | |
| Bellevue, WA | 8 mi | 71°F | 53°F | 1.7 in |
| Kirkland, WA | 8 mi | 71°F | 53°F | 1.7 in |
| Redmond, WA | 11 mi | 71°F | 53°F | 1.7 in |
| Renton, WA | 12 mi | 72°F | 54°F | 1.6 in |
| Kent, WA | 17 mi | 72°F | 54°F | 1.6 in |
| Federal Way, WA | 20 mi | 72°F | 54°F | 1.6 in |
Frequently asked questions
What is the weather like in Seattle in September?
In September, Seattle averages a high of 71°F and a low of 53°F, with 1.7 inches of precipitation (NOAA 1991-2020 normals).
Is September a good time to visit Seattle?
Yes. September is one of Seattle's most comfortable months by our rule: highs between 62°F and 86°F, lows of 42°F or more and modest rain.
Does it snow in Seattle in September?
Rarely. The September snowfall normal is under half an inch.
Before and after: Seattle in August and Seattle in October. All twelve months: Seattle weather by month.
NOAA NCEI 1991-2020 climate normals, station Seattle Sand Pt WSFO, WA, 6.6 miles from the city center.