South Holston Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in South Holston Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in South Holston Lake today is 24.1°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health. 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 |
|---|---|---|---|
| JUN 10 | 22.7°C | 23.2°C | |
| JUN 11 | 22.6°C | 23.2°C | |
| JUN 12 | 22.6°C | 23.2°C | |
| JUN 13 | 23.2°C | 23.2°C | |
| JUN 14 | 23.3°C | 23.2°C | |
| JUN 15 | 23.4°C | 23.2°C | |
| JUN 16 | 23.4°C | 23.2°C | |
| JUN 17 | 24.1°C | 23.2°C | |
| JUN 18 | 23.2°C | 24.1°C | |
| JUN 19 | 23.2°C | 24.0°C | |
| JUN 20 | 23.2°C | 24.0°C | |
| JUN 21 | 23.2°C | 23.9°C | |
| JUN 22 | 23.2°C | 23.9°C | |
| JUN 23 | 23.2°C | 23.8°C | |
| JUN 24 | 23.2°C | 23.8°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 | 4°C | 11°C | 17°C |
| February | 4°C | 12°C | 19°C |
| March | 5°C | 12°C | 19°C |
| April | 11°C | 18°C | 25°C |
| May | 15°C | 21°C | 26°C |
| June | 19°C | 23°C | 27°C |
| July | 24°C | 28°C | 32°C |
| August | 23°C | 27°C | 30°C |
| September | 21°C | 26°C | 30°C |
| October | 16°C | 21°C | 26°C |
| November | 11°C | 17°C | 22°C |
| December | 5°C | 10°C | 15°C |
South Holston Lake: Water Temperature by Location
South Holston Lake: Weather Forecast
June 18
June 19
June 20
June 21
June 22
Location & Local Information
South Holston Lake, in northeast Tennessee, typically follows the seasonal patterns of a deep reservoir. Surface temperatures in winter commonly range from about 35–45°F (2–7°C). In spring the water warms into the mid‑40s to mid‑60s°F (7–18°C) as air temperatures rise and stratification begins. Summer surface temperatures are generally the warmest, often sitting between 70–80°F (21–27°C) and occasionally reaching 80–85°F (27–29°C) in shallow coves on hot weeks. In autumn the lake cools again, with surface readings dropping into the 50s–60s°F (10–18°C). Deeper water remains substantially colder year‑round, and releases from the dam can produce localized cold currents that are much cooler than surface values.
Swimming in South Holston is generally permitted, but facilities and designated swim beaches are limited, and there are no lifeguards at most access points. Because the lake can stratify and cold water can be present suddenly near the dam or in deeper areas, hypothermia is a real risk outside of warm summer months even when air temperatures feel comfortable. Boat traffic, submerged structure, and variable currents mean swimmers should choose sheltered spots, wear personal flotation devices if appropriate, and heed posted warnings or closures. Local authorities and park managers set specific rules and advisories, so checking current notices before entering the water is advisable.