Lake WashingtonWater Level & Temperature
Lake Washington water level & water temperature
Lake Washington water level is updated continuously from the operating agency. Typical level elevation is 22 ft. Live reading, 7-day trend, and multi-year history appear below as the data loads.
Lake Washington water temperature by month
Lake Washington surface water temperature averages from about 44°F in February to 68°F in August over the year, based on a 40-year USGS model (1980–2020). Cold-water caution applies in roughly half the year, when the typical temperature is below 60°F.
Jan
44°
Feb
44°
Mar
47°
Apr
51°
May
58°
Jun
62°
Jul
66°
Aug
68°
Sep
66°
Oct
59°
Nov
50°
Dec
45°
Typical surface temperatures (°F), modeled historical averages (USGS 185k-lake dataset, 1980–2020). Colors flag cold-water risk: blue/amber/red = cool, caution, danger. Live and recent readings appear above where a sensor is available.