Sam Rayburn Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Sam Rayburn Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Sam Rayburn Reservoir today is 30.8°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 |
|---|---|---|---|
| AUG 4 | 32.3°C | 29.0°C | |
| AUG 5 | 32.3°C | 29.0°C | |
| AUG 6 | 32.3°C | 29.0°C | |
| AUG 7 | 32.4°C | 29.0°C | |
| AUG 8 | 32.4°C | 29.0°C | |
| AUG 9 | 32.4°C | 29.0°C | |
| AUG 10 | 32.3°C | 29.0°C | |
| AUG 11 | 31.0°C | 29.0°C | |
| AUG 12 | 29.0°C | 30.7°C | |
| AUG 13 | 29.0°C | 30.6°C | |
| AUG 14 | 29.0°C | 30.5°C | |
| AUG 15 | 29.0°C | 30.4°C | |
| AUG 16 | 29.0°C | 30.4°C | |
| AUG 17 | 29.0°C | 30.3°C | |
| AUG 18 | 29.0°C | 30.2°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 | 6°C | 12°C | 18°C |
| February | 6°C | 11°C | 17°C |
| March | 9°C | 15°C | 22°C |
| April | 11°C | 17°C | 24°C |
| May | 18°C | 25°C | 32°C |
| June | 24°C | 29°C | 34°C |
| July | 25°C | 29°C | 33°C |
| August | 25°C | 29°C | 33°C |
| September | 23°C | 25°C | 27°C |
| October | 23°C | 27°C | 30°C |
| November | 17°C | 20°C | 23°C |
| December | 10°C | 14°C | 19°C |
Sam Rayburn Reservoir: Water Temperature by Location
Sam Rayburn Reservoir: Weather Forecast
August 12
August 13
August 14
August 15
Location & Local Information
Sam Rayburn Reservoir in southeast Texas experiences noticeable seasonal shifts in water temperature. In winter months surface temperatures commonly drop into the mid-40s to mid-50s °F (about 7–13 °C), while spring brings a warming trend into the mid-50s to mid-70s °F (roughly 13–24 °C). Summer typically produces the warmest surface readings, often ranging from the mid-70s to mid-80s °F and occasionally reaching the upper 80s to around 90 °F (about 24–32 °C). Autumn sees a steady cooling back toward spring values. These figures are for surface water; deeper parts of the reservoir remain cooler and conditions can change quickly with weather, wind and inflow from tributaries.
Swimming at Sam Rayburn is commonly practiced and permitted in many areas, but it is largely informal rather than organized—there are few lifeguarded public beaches, and swimming often happens from boat ramps, parks and private shorelines. Because of boat traffic, submerged structure, variable depths and occasional water-quality advisories (including algae or bacterial concerns), swimmers should exercise caution, choose sheltered spots, wear buoyancy aids if uncertain, and check current conditions before entering the water. Late spring through early fall offers the most comfortable temperatures for swimming.