Lake SunapeeWater Level & Temperature
Lake Sunapee water level & water temperature
Lake Sunapee water level is updated continuously from the operating agency. Typical level elevation is 1093 ft. Live reading, 7-day trend, and multi-year history appear below as the data loads.
Lake Sunapee water temperature by month
Lake Sunapee surface water temperature averages from about 35°F in February to 75°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
35°
Feb
35°
Mar
36°
Apr
41°
May
53°
Jun
67°
Jul
74°
Aug
75°
Sep
68°
Oct
57°
Nov
46°
Dec
38°
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.