Where is Lake Washington?

Lake Washington is a lake in Washington.

What is the water temperature at Lake Washington?

As of August 20, 2026, the water temperature at Lake Washington in Washington is 57°F (14°C), measured by NOAA buoy TCNW1, 25.6 miles away.

How is Lake Washington rated?

Lake Washington in Washington has an average visitor rating of 4.7 out of 5, based on 270 reviews.

Updated August 13, 2025

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Photo: Lake Washington region by Jeffmeyer (CC BY-SA 3.0) License

Lake Washington

Lake

4.7(270 reviews)

Read reviews

Hot — visit early

The 2nd largest natural lake in Washington, this lake provides sport fishing opportunities.

Current water conditions

Water temp

57°F

14°C

Cold water — serious cold-shock risk today. At this temperature, sudden immersion can trigger involuntary gasping and sap a strong swimmer's strength within minutes. Enter slowly, never alone, and consider a wetsuit — or sit this one out.

Live data from NOAA buoy TCNW1 (25.6 mi away), as of Aug 20, 10:30 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 Washington

H: 91° L: 58°

Sunny

91°

Feels like 89°

Precipitation

Humidity

29%

Wind

7 mph

UV Index

3.7

Water Conditions:

🏊Perfect for swimming

12 AM

65°

3 AM

61°

6 AM

58°

9 AM

66°

12 PM

84°

3 PM

90°

6 PM

87°

9 PM

73°

Pack smarter for Lake Washington

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.

Inflatable PaddleboardA popular way to explore calm coves and shorelines.

Compare on Amazon →

Life JacketImportant around boats, paddling, and deeper swimming areas.

Compare on Amazon →

Floating CoolerKeeps drinks nearby for swim areas, docks, and boats.

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Waterproof Phone PouchProtects phones around docks, boats, and splashy shorelines.

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Frequently asked questions

Where is Lake Washington?: Lake Washington is a lake in Washington.
What is the water temperature at Lake Washington?: As of August 20, 2026, the water temperature at Lake Washington in Washington is 57°F (14°C), measured by NOAA buoy TCNW1, 25.6 miles away.
Can you swim at Lake Washington?: There is no fixed answer for Lake Washington: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at Lake Washington in Washington. Check current water conditions before you go, and follow posted signs and local guidance.
How is Lake Washington rated?: Lake Washington in Washington has an average visitor rating of 4.7 out of 5, based on 270 reviews.

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Been here? A quick note helps the next visitor plan their day. Handy things to mention:

Water temperatureCrowds & parkingBest time to goSafety & access

Best Times to Visit

☀️

Right Now

Very warm - visit early morning or evening

🏞️ Lakes Tips:

›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

Best Seasons:

☀️ Summer (Jun-Aug)🍂 Fall (Sep-Nov)🌸 Spring (Mar-May)

Location & Contact

Washington

Washington None

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