Lake HartwellWater Level & Temperature
Lake Hartwell water level & water temperature
Lake Hartwell water level is updated continuously from USGS gauge 02187010 (NGVD29). Full pool elevation is 660 ft. Live reading, 7-day trend, and multi-year history appear below as the data loads.
Lake Hartwell water temperature by month
Lake Hartwell surface water temperature averages from about 48°F in January to 87°F in July over the year, based on a 40-year USGS model (1980–2020). Cold-water caution applies in January, February, March and December, when the typical temperature is below 60°F.
Jan
48°
Feb
49°
Mar
56°
Apr
66°
May
77°
Jun
84°
Jul
87°
Aug
86°
Sep
82°
Oct
73°
Nov
62°
Dec
52°
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.