Watts Bar Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Watts Bar Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Watts Bar Lake today is 27.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. 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 |
|---|---|---|---|
| JUL 14 | 26.7°C | 26.0°C | |
| JUL 15 | 29.0°C | 26.0°C | |
| JUL 16 | 29.0°C | 26.0°C | |
| JUL 17 | 29.0°C | 26.0°C | |
| JUL 18 | 26.3°C | 26.0°C | |
| JUL 19 | 26.4°C | 26.0°C | |
| JUL 20 | 27.0°C | 26.0°C | |
| JUL 21 | 27.4°C | 26.0°C | |
| JUL 22 | 26.0°C | 27.4°C | |
| JUL 23 | 26.0°C | 27.4°C | |
| JUL 24 | 26.0°C | 27.3°C | |
| JUL 25 | 26.0°C | 27.2°C | |
| JUL 26 | 26.0°C | 27.1°C | |
| JUL 27 | 26.0°C | 27.1°C | |
| JUL 28 | 26.0°C | 27.0°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 | 10°C |
| March | 4°C | 10°C | 16°C |
| April | 12°C | 17°C | 22°C |
| May | 17°C | 21°C | 25°C |
| June | 20°C | 24°C | 26°C |
| July | 23°C | 26°C | 29°C |
| August | 21°C | 24°C | 27°C |
| September | 21°C | 25°C | 28°C |
| October | 18°C | 22°C | 25°C |
| November | 12°C | 16°C | 20°C |
| December | 6°C | 10°C | 13°C |
Watts Bar Lake: Water Temperature by Location
Watts Bar Lake: Weather Forecast
July 22
July 23
July 24
July 25
Location & Local Information
Watts Bar Lake, a reservoir on the Tennessee River, experiences clear seasonal swings in surface water temperature. In winter, surface temperatures commonly fall into the mid-30s to around 50°F (about 2–10°C). Spring brings a steady rise, typically 50–70°F (10–21°C) as the lake warms, while summer is when surface readings usually peak in the mid-70s to mid-80s°F (roughly 24–29°C), occasionally higher during heat waves. In autumn the water cools back into the 55–70°F range (13–21°C). These figures refer mainly to surface conditions; deeper water remains substantially colder year-round because of stratification and inflows near the dam, so thermal gradients and cold pockets can exist even in warm months.
Swimming at Watts Bar is allowed in many locations and the lake is widely used for recreational bathing, but it is subject to local rules, posted restrictions, and safety considerations. Designated public access points and marinas tend to permit swimming, yet some shorelines are private or marked no-swimming, and boat traffic, submerged structures, sudden drop-offs and occasional water-quality advisories can make certain areas hazardous. Visitors should follow shoreline signage, check for any health advisories from local authorities, use flotation devices where appropriate, and be mindful of changing temperatures that can increase risk of cold-water shock or hypothermia.