Where is Lake Sammamish?

Lake Sammamish is a lake in Washington.

What is the water temperature at Lake Sammamish?

As of August 20, 2026, the water temperature at Lake Sammamish in Washington is 57°F (14°C), measured by NOAA buoy TCNW1, 28.1 miles away.

How is Lake Sammamish rated?

Lake Sammamish in Washington has an average visitor rating of 4.7 out of 5, based on 143 reviews.

Updated August 13, 2025

Photo: Lake Sammamish Trail (7319115434) by Robert Ashworth from Bellingham, WA., USA (CC BY 2.0) License

Lake Sammamish

Lake

4.7(143 reviews)

Read reviews

Hot — visit early

Parkland surrounds this freshwater lake with boating, waterskiing, picnic shelters & hiking trails.

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 (28.1 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 Sammamish

H: 93° L: 57°

Sunny

93°

Feels like 91°

Precipitation

Humidity

30%

Wind

6 mph

UV Index

3.7

Water Conditions:

🏊Perfect for swimming

12 AM

64°

3 AM

60°

6 AM

57°

9 AM

67°

12 PM

86°

3 PM

92°

6 PM

90°

9 PM

74°

Pack smarter for Lake Sammamish

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.

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

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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 Sammamish?: Lake Sammamish is a lake in Washington.
What is the water temperature at Lake Sammamish?: As of August 20, 2026, the water temperature at Lake Sammamish in Washington is 57°F (14°C), measured by NOAA buoy TCNW1, 28.1 miles away.
Can you swim at Lake Sammamish?: There is no fixed answer for Lake Sammamish: whether it is safe to swim there on a given day depends on the water temperature, recent rainfall, and any advisories posted at Lake Sammamish in Washington. Check current water conditions before you go, and follow posted signs and local guidance.
How is Lake Sammamish rated?: Lake Sammamish in Washington has an average visitor rating of 4.7 out of 5, based on 143 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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