Events in Seattle in September 2027
Seattle event dates for September 2027 are still being announced. Start with the planning leads and the city guide below — the lineup firms up closer to September.
Seattle's September 2027 lineup is still being announced — planning leads below.
By TripSapien · Updated September 24, 2026
Sourced events
Dates for this month are still being announced. Start with the planning leads below, or build the rest of your visit from the city guide.
Open the Seattle guideGoing to Seattle in September?
Add your dates and we'll build the rest of your trip around these events — every place checked for closures and booking needs.
Planning leads
Early leads on events still lining up. Exact dates and details firm up closer to your trip.
- Sep 3 - Sep 5
Night Market & Autumn Moon Festival 2027
A vibrant Chinese festival celebrating the Mid-Autumn Moon with food vendors, cultural performances, and an outdoor night market in Seattle's Chinatown-International District.
Planning lead · details firm up closer in · Source: festival research
- Sep 4 - Sep 5
Seattle. Now in its fourth decade, Bumbershoot (a oldie time word for umbrella) is more of an institution than a music festival.
Planning lead · projected date · Source: festival calendar
- Sep 4 - Sep 6
Bumbershoot Music and Arts Festival 2027
Seattle's largest music and arts festival featuring dozens of local and world-class musical acts, along with visual arts, comedy, and performance events over Labor Day weekend.
Planning lead · details firm up closer in · Source: festival research
Holidays, observances & long weekends
Holiday and observance schedules can affect services and venue hours; confirm each place directly.
- Labour Day · publicSep 6
- Long weekendSep 4–Sep 6
Holiday data: date-holidays (ISC/CC-BY-3.0).
Ready to plan Seattle?
Turn these September events into a full Seattle plan, every place checked for closures, limited hours, and booking needs on your dates.