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 28°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 | 26.0°C | 27.5°C | |
| JUL 15 | 28.0°C | 27.5°C | |
| JUL 16 | 28.1°C | 27.5°C | |
| JUL 17 | 28.2°C | 27.5°C | |
| JUL 18 | 28.0°C | 27.5°C | |
| JUL 19 | 28.2°C | 27.5°C | |
| JUL 20 | 28.2°C | 27.5°C | |
| JUL 21 | 28.5°C | 27.5°C | |
| JUL 22 | 27.5°C | 28.0°C | |
| JUL 23 | 27.5°C | 28.0°C | |
| JUL 24 | 27.5°C | 27.9°C | |
| JUL 25 | 27.5°C | 27.9°C | |
| JUL 26 | 27.5°C | 27.9°C | |
| JUL 27 | 27.5°C | 27.9°C | |
| JUL 28 | 27.5°C | 27.8°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 | 23°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
July 22
July 23
July 24
July 25
July 26
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.