Fort Loudoun Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Fort Loudoun Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Fort Loudoun Lake today is 21°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| OCT 6 | 23.0°C | 20.5°C | |
| OCT 7 | 23.0°C | 20.5°C | |
| OCT 8 | 22.0°C | 20.5°C | |
| OCT 9 | 22.3°C | 20.5°C | |
| OCT 10 | 21.8°C | 20.5°C | |
| OCT 11 | 22.5°C | 20.5°C | |
| OCT 12 | 21.1°C | 20.5°C | |
| OCT 13 | 21.0°C | 20.5°C | |
| OCT 14 | 20.5°C | 21.0°C | |
| OCT 15 | 20.5°C | 21.0°C | |
| OCT 16 | 20.5°C | 20.9°C | |
| OCT 17 | 20.5°C | 20.9°C | |
| OCT 18 | 20.5°C | 20.9°C | |
| OCT 19 | 20.5°C | 20.9°C | |
| OCT 20 | 20.5°C | 20.8°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 2°C | 7°C | 11°C |
| February | 3°C | 7°C | 11°C |
| March | 4°C | 10°C | 16°C |
| April | 12°C | 17°C | 22°C |
| May | 17°C | 23°C | 27°C |
| June | 18°C | 24°C | 30°C |
| July | 21°C | 25°C | 29°C |
| August | 22°C | 26°C | 30°C |
| September | 21°C | 27°C | 33°C |
| October | 17°C | 21°C | 24°C |
| November | 11°C | 14°C | 17°C |
| December | 7°C | 10°C | 13°C |
Fort Loudoun Lake: Water Temperature by Location
Fort Loudoun Lake: Weather Forecast
October 14
October 15
October 16
October 17
Location & Local Information
Fort Loudoun Lake, a TVA reservoir on the Tennessee River near Knoxville, experiences a wide seasonal swing in surface water temperature. In winter the surface typically cools to roughly 35–50°F (2–10°C), while spring months commonly see warming into the 50–70°F range (10–21°C). Summer brings the warmest conditions, with surface readings often between 75–85°F (24–29°C) and occasional highs a bit above that on hot, stagnant days. By fall temperatures usually fall back toward 60–75°F (15–24°C). These numbers vary with weather, wind, depth and inflows; deeper water stays colder year‑round and daily changes can be substantial after storms or cold fronts.
Swimming in Fort Loudoun Lake is generally permitted in many shoreline areas but there are no widespread lifeguarded public beaches and local rules differ by park or marina. Recreational swimming is allowed primarily because the reservoir is used for boating and fishing, but swimmers should be cautious: boat traffic, submerged structures, steep drop-offs and cold thermoclines pose risks, and access is restricted near the dam and some TVA facilities. Water quality is usually acceptable for recreation, though occasional advisories for algae or bacteria can occur, so checking local health and park notices before entering is advised. Swimmers should also respect signage and use personal flotation devices when appropriate.