Lake Lyndon B Johnson — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Lyndon B Johnson, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Lyndon B Johnson today is 29.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature is above 82°F (28°C). This is very warm water, which may feel almost hot to most people. Swimming in such conditions is perfect for those seeking relaxation and comfort in the water. These waters are often preferred for relaxation in hot weather, as the water temperature does not cool the body significantly. However, it is important to remember that in such warm waters, caution is necessary, as prolonged exposure without rest can lead to overheating. 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 | 31.1°C | 29.5°C | |
| JUL 15 | 30.8°C | 29.5°C | |
| JUL 16 | 30.2°C | 29.5°C | |
| JUL 17 | 30.2°C | 29.5°C | |
| JUL 18 | 29.3°C | 29.5°C | |
| JUL 19 | 29.4°C | 29.5°C | |
| JUL 20 | 29.4°C | 29.5°C | |
| JUL 21 | 29.4°C | 29.5°C | |
| JUL 22 | 29.5°C | 29.6°C | |
| JUL 23 | 29.5°C | 29.6°C | |
| JUL 24 | 29.5°C | 29.6°C | |
| JUL 25 | 29.5°C | 29.6°C | |
| JUL 26 | 29.5°C | 29.6°C | |
| JUL 27 | 29.5°C | 29.6°C | |
| JUL 28 | 29.5°C | 29.6°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 | 8°C | 12°C | 17°C |
| February | 9°C | 13°C | 17°C |
| March | 8°C | 15°C | 22°C |
| April | 16°C | 20°C | 25°C |
| May | 20°C | 25°C | 30°C |
| June | 24°C | 27°C | 29°C |
| July | 26°C | 30°C | 33°C |
| August | 25°C | 28°C | 30°C |
| September | 26°C | 29°C | 32°C |
| October | 24°C | 26°C | 29°C |
| November | 14°C | 19°C | 23°C |
| December | 9°C | 13°C | 17°C |
Lake Lyndon B Johnson: Water Temperature by Location
Lake Lyndon B Johnson: Weather Forecast
July 22
July 23
July 24
July 25
July 26
Location & Local Information
Lake Lyndon B. Johnson (Lake LBJ) in the Texas Hill Country is a warm, relatively shallow reservoir whose surface temperatures vary with the seasons. Typical winter surface temperatures commonly run in the 50–60°F range (about 10–16°C), while spring usually warms into the 60s and lower 70s°F (roughly 16–23°C). Summer surface readings often reach the mid- to upper-70s and can climb into the low 80s–90°F on hot days (around 25–32°C). In autumn the lake cools back toward the 60s–70s°F band (about 16–24°C). Local conditions, weather patterns and depth can shift these numbers day to day, and cooler water can persist in shaded coves or where cooler inflows occur.
Swimming in Lake LBJ is generally allowed and common because the lake is managed for multiple recreational uses, including boating and waterfront recreation, and public parks and private properties provide shoreline access. That said, there are areas where swimming is discouraged or restricted — near dams, intake structures, marinas or private property — and local authorities may issue temporary advisories for water quality issues such as algal blooms or contamination. Swimmers should heed posted signs, follow local regulations and be mindful of boat traffic and changing water temperatures for safety.