United States
Seattle in September
🍂 AutumnPleasant and some showers.
Why September scores 9.0What goes into the score
How it works- Weather comfort9.5
- ✓Comfortable temperatures (22°C highs / 12°C lows)
- ✓Comfortable humidity (dew point 11.5°C)
- ✓Mostly dry (~58 mm rain)
- Air quality7.5
- ✓Moderate (PM2.5 ~21 µg/m³)
- Seasonal hazards10.0
- ·No notable seasonal hazards
- Safety baseline7.5
- ·Increased caution
| Sep | Jul | |
|---|---|---|
| Score | 9.0 Excellent | 9.6 Excellent |
| Season | 🍂 Autumn | ☀️ Summer |
| High / low | 22° / 12° | 25° / 14° |
| Rain | 58 mm | 14 mm |
| Humidity | dew pt 12° | dew pt 14° |
| PM2.5 | 21 µg/m³ | 7 µg/m³ |
Typical-month data: NASA POWER (MERRA-2 reanalysis) 2015–2024 (modelled, not a forecast). Temperatures: Seattle weather-station normals.
Holidays & crowdsSeptember 2027
Long weekendThere's at least one long weekend. Domestic travel picks up and popular spots get busier over those days.
- Labor Day 4–6 Sep · 3 days off in a row
National holidays only; regional holidays and school breaks aren't included. Source: holidays (open-source public-holiday calendar).
Explore SeattleEvents, sights, food & souvenirs
Check event dates locallyPacific Northwest city on Puget Sound, known for Pike Place Market, the Space Needle, coffee culture and views of Mount Rainier.
BumbershootDate variesUsually Labor Day weekend
A long-running music and arts festival.
Why go: Tickets are required.
Where: Seattle Center
Coming up later
Northwest Folklife FestivalDate variesUsually Memorial Day weekend (late May)
A large community festival of folk music, dance and crafts.
Why go: Free to attend, with donations encouraged.
Where: Seattle Center
Seattle PrideDate variesUsually the last weekend of June
A Pride parade through downtown and events across the city.
Why go: Downtown streets close for the parade.
Where: Downtown and Capitol Hill
SeafairDate variesUsually July to early August
A summer festival season ending with hydroplane boat races and Blue Angels air shows.
Why go: The race weekend draws big crowds to the lake shore.
Where: Lake Washington and neighbourhoods
Pike Place Market
A historic public market with fish stalls, produce and crafts.
Space Needle and Chihuly Garden and Glass
An observation tower next to a museum of glass art.
Museum of Pop Culture
A museum of music and pop culture.
Bainbridge Island ferry
A ferry ride across Puget Sound with city views.
Mount Rainier National Parkgreat in Sep
A glaciated volcano with wildflower meadows.
💡 Wildflowers peak in midsummer; some roads close in winter.
Ballard Locksgreat in Sep
Locks with a fish ladder where salmon can be seen.
Salmon
Pacific salmon, often grilled or smoked.
💡 Seafood restaurants and Pike Place Market
Oysters
Local oysters.
💡 Oyster bars
Dungeness crab
Sweet Pacific crab.
💡 Seafood restaurants
Coffee
Seattle has a strong coffee culture.
💡 Independent cafes
Seattle-style teriyaki
Grilled chicken with a sweet sauce.
💡 Teriyaki shops
Coffee
Beans from local roasters.
💡 Cafes
Smoked salmon
Vacuum-packed smoked salmon.
💡 Pike Place Market
Northwest Coast art
Indigenous art.
💡 Galleries