Updated
Lake Union
Lake · Seattle, Washington
Picturesque freshwater lake providing a popular boating spot & an annual wooden boat festival.
Things to Do Near Lake Union
Top-rated tours and experiences around Seattle, powered by Viator — free cancellation on most.
Seattle Lake Union Private Boat Cruise To Lake Washington BYOB
Seattle Locks Cruise
Beneath The Streets Underground History Tour
One-Way Transfer: SeaTac Airport to Seattle Piers 66 & 91
We earn a commission on bookings — at no extra cost to you. Helps keep this site free.
Stay near Lake Union
Find hotels near Lake Union
Compare prices on Expedia — free cancellation on most rooms.
We earn a commission on bookings — at no extra cost to you. Helps keep this site free.
Current water conditions
Live data from NOAA buoy TCNW1 (26 mi away), as of Aug 20, 8:54 PM UTC. Conditions are for general information only and can change quickly — always judge the water in person and follow posted advisories before swimming.
Weather at Lake Union
Sponsored gear checklist
Pack smarter for Lake Union
Useful gear categories for this kind of water spot. These links open Amazon search results so you can compare current options.
As an Amazon Associate we earn from qualifying purchases.
Frequently asked questions
- Where is Lake Union?
- Lake Union is a lake in Seattle, Washington.
- What is the water temperature at Lake Union?
- As of August 20, 2026, the water temperature at Lake Union in Seattle, Washington is 57°F (14°C), measured by NOAA buoy TCNW1, 26 miles away.
- Can you swim at Lake Union?
- There is no fixed answer for Lake Union: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at Lake Union in Seattle, Washington. Check current water conditions before you go, and follow posted signs and local guidance.
- How is Lake Union rated?
- Lake Union in Seattle, Washington has an average visitor rating of 4.8 out of 5, based on 189 reviews.
- What amenities does Lake Union have?
- Visitor-listed amenities at Lake Union include pet-friendly.
Visitor Reviews
Be the first to share your experience here
Join our community to share your water adventures
Earn badges as you share your experiences!
No reviews yet — share what you know
Been here? A quick note helps the next visitor plan their day. Handy things to mention:
Best Times to Visit
- ›Check for boat launch facilities and fees
- ›Obtain required fishing licenses before arrival
- ›Be aware of lake-specific regulations and restrictions
- ›Monitor water quality reports before swimming
</> Embed this location on your site
Paste this snippet into your website to show a live badge for Lake Union — free to use with the included credit link.