Fort Patrick Henry Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Fort Patrick Henry Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Fort Patrick Henry Lake today is 24°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 23 | 24.9°C | 23.4°C | |
| JUN 24 | 24.7°C | 23.4°C | |
| JUN 25 | 24.8°C | 23.4°C | |
| JUN 26 | 24.6°C | 23.4°C | |
| JUN 27 | 24.6°C | 23.4°C | |
| JUN 28 | 24.3°C | 23.4°C | |
| JUN 29 | 24.5°C | 23.4°C | |
| JUN 30 | 24.2°C | 23.4°C | |
| JUL 1 | 27.5°C | 24.2°C | |
| JUL 2 | 27.5°C | 24.4°C | |
| JUL 3 | 27.5°C | 24.5°C | |
| JUL 4 | 27.5°C | 24.7°C | |
| JUL 5 | 27.5°C | 24.9°C | |
| JUL 6 | 27.5°C | 25.1°C | |
| JUL 7 | 27.5°C | 25.2°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 | 5°C | 11°C | 17°C |
| February | 4°C | 12°C | 19°C |
| March | 5°C | 12°C | 19°C |
| April | 12°C | 19°C | 25°C |
| May | 16°C | 22°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 | 12°C | 17°C | 22°C |
| December | 5°C | 11°C | 16°C |
Fort Patrick Henry Lake: Water Temperature by Location
Fort Patrick Henry Lake: Weather Forecast
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Location & Local Information
Fort Patrick Henry Lake, a reservoir on the South Fork Holston River in northeast Tennessee, experiences pronounced seasonal swings in surface temperature. In winter the water typically cools to roughly 35–50°F (2–10°C). Spring brings a gradual rise into the mid 40s to mid 60s F (7–18°C) as air temperatures warm and runoff increases. Summer surface temperatures commonly reach about 70–80°F (21–27°C), and on hot, calm days can climb into the low 80s F (27–28°C), while deeper or shaded areas remain noticeably cooler. During autumn the surface generally falls back into the mid 50s to low 70s F (13–22°C). Reservoir releases, inflows and weather can shift these ranges, and thermal stratification means deeper water stays colder than the surface.
Swimming is generally permitted in many public access areas around the lake, but there are important safety and practical limitations. Authorities and the reservoir operator advise avoiding swimming near the dam, intakes, and heavy boat traffic because of strong currents, sudden releases and submerged hazards. There are few if any lifeguarded beaches, and water quality can vary after heavy rains or during algal events, so local advisories should be checked. Because cooler temperatures increase the risk of cold-water shock and fatigue, swimmers should judge conditions carefully and use flotation and common-sense precautions.