San Antonio — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in San Antonio, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in San Antonio today is 34.2°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 6 | 32.4°C | 25.7°C | |
| AUG 7 | 32.5°C | 25.7°C | |
| AUG 8 | 32.5°C | 25.7°C | |
| AUG 9 | 32.5°C | 25.7°C | |
| AUG 10 | 32.6°C | 25.7°C | |
| AUG 11 | 34.3°C | 25.7°C | |
| AUG 12 | 34.2°C | 25.7°C | |
| AUG 13 | 34.2°C | 25.7°C | |
| AUG 14 | 25.7°C | 33.8°C | |
| AUG 15 | 25.7°C | 33.4°C | |
| AUG 16 | 25.7°C | 32.9°C | |
| AUG 17 | 25.7°C | 32.5°C | |
| AUG 18 | 25.7°C | 32.1°C | |
| AUG 19 | 25.7°C | 31.7°C | |
| AUG 20 | 25.7°C | 31.2°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 | 3°C | 12°C | 21°C |
| February | 3°C | 12°C | 22°C |
| March | 3°C | 15°C | 26°C |
| April | 5°C | 16°C | 27°C |
| May | 8°C | 19°C | 29°C |
| June | 14°C | 21°C | 28°C |
| July | 17°C | 25°C | 32°C |
| August | 17°C | 26°C | 35°C |
| September | 11°C | 20°C | 29°C |
| October | 8°C | 18°C | 28°C |
| November | 3°C | 15°C | 26°C |
| December | 14°C | 18°C | 22°C |
San Antonio: Weather Forecast
August 13
August 14
August 15
August 16
August 17
August 18
Location & Local Information
San Antonio, Texas, is home to a variety of water bodies, with temperatures in rivers, lakes, and other natural features fluctuating based on the season. The San Antonio River, which flows through the heart of the city, typically has warmer water during the summer, ranging from 75°F to 85°F (24°C to 29°C). While the river is popular for leisurely activities like walking along the riverwalk and enjoying the city’s scenic views, swimming in the San Antonio River itself is generally not encouraged. The river is more suited for sightseeing and kayaking rather than swimming due to urban runoff and occasional water quality concerns.
In addition to the river, San Antonio has several notable swimming destinations, such as the natural springs of the San Marcos River, located just outside the city, or the city's many public pools. For those seeking cooler, clearer water, the springs in areas like the Guadalupe River maintain a temperature range of 68°F to 72°F (20°C to 22°C) year-round, providing a refreshing option for swimming, tubing, and canoeing. The area's lakes, including Braunig Lake and Calaveras Lake, also offer more controlled environments for swimming, with water temperatures typically ranging from 80°F to 90°F (27°C to 32°C) in the summer months, making them ideal for a day of swimming or boating in a more serene atmosphere.
Overall, while the San Antonio River is a scenic spot for other activities, the city's lakes, spring-fed rivers, and public pools are the best options for swimming in the area.