Calaveras Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Calaveras Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Calaveras Lake today is 34.4°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 | 32.6°C | 31.2°C | |
| AUG 5 | 32.6°C | 31.2°C | |
| AUG 6 | 32.6°C | 31.2°C | |
| AUG 7 | 32.6°C | 31.2°C | |
| AUG 8 | 32.6°C | 31.2°C | |
| AUG 9 | 32.6°C | 31.2°C | |
| AUG 10 | 32.6°C | 31.2°C | |
| AUG 11 | 34.4°C | 31.2°C | |
| AUG 12 | 31.2°C | 34.2°C | |
| AUG 13 | 31.2°C | 34.1°C | |
| AUG 14 | 31.2°C | 33.9°C | |
| AUG 15 | 31.2°C | 33.8°C | |
| AUG 16 | 31.2°C | 33.6°C | |
| AUG 17 | 31.2°C | 33.4°C | |
| AUG 18 | 31.2°C | 33.3°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 | 9°C | 15°C | 21°C |
| February | 9°C | 16°C | 22°C |
| March | 15°C | 20°C | 26°C |
| April | 11°C | 19°C | 27°C |
| May | 21°C | 27°C | 32°C |
| June | 23°C | 29°C | 34°C |
| July | 24°C | 29°C | 33°C |
| August | 28°C | 31°C | 35°C |
| September | 23°C | 26°C | 29°C |
| October | 25°C | 27°C | 30°C |
| November | 17°C | 22°C | 26°C |
| December | 14°C | 18°C | 22°C |
Calaveras Lake: Water Temperature by Location
Calaveras Lake: Weather Forecast
August 12
August 13
August 14
August 15
Location & Local Information
Calaveras Lake, a man-made reservoir near San Antonio, is operated primarily as a cooling lake for power generation, so its water temperatures tend to run warmer and fluctuate with plant operations and seasonal weather. Typical surface temperatures in winter commonly sit around 50–60°F (10–15°C), rising through spring into roughly 60–75°F (15–24°C). Summer temperatures are the warmest, often reaching 75–95°F (24–35°C) or higher in localized discharge zones, while fall usually cools back to about 60–80°F (15–27°C). Because the lake functions as part of industrial cooling, temperature can vary across short distances and change quickly depending on generation cycles and ambient conditions.
Swimming at Calaveras Lake is generally not permitted because of its role as a cooling reservoir and the safety and water-quality risks that entails. Warm discharge areas can create strong thermal gradients and currents, submerged infrastructure and intake or outflow structures pose hazards, and variable conditions increase the chance of sudden temperature spikes or algal growth. For those seeking recreational swimming, nearby public pools and designated recreational lakes maintained for bathing are safer and more appropriate choices than a working cooling lake like Calaveras.