Lake Murray — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Murray, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Murray today is 30°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 | 27.1°C | 28.9°C | |
| JUL 15 | 30.9°C | 28.9°C | |
| JUL 16 | 30.9°C | 28.9°C | |
| JUL 17 | 30.8°C | 28.9°C | |
| JUL 18 | 30.8°C | 28.9°C | |
| JUL 19 | 30.8°C | 28.9°C | |
| JUL 20 | 30.3°C | 28.9°C | |
| JUL 21 | 29.6°C | 28.9°C | |
| JUL 22 | 28.9°C | 29.9°C | |
| JUL 23 | 28.9°C | 29.9°C | |
| JUL 24 | 28.9°C | 29.8°C | |
| JUL 25 | 28.9°C | 29.8°C | |
| JUL 26 | 28.9°C | 29.7°C | |
| JUL 27 | 28.9°C | 29.7°C | |
| JUL 28 | 28.9°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 | 14°C | 24°C | 32°C |
| February | 14°C | 23°C | 32°C |
| March | 16°C | 24°C | 32°C |
| April | 17°C | 25°C | 32°C |
| May | 20°C | 26°C | 32°C |
| June | 22°C | 27°C | 32°C |
| July | 24°C | 29°C | 33°C |
| August | 27°C | 30°C | 33°C |
| September | 26°C | 29°C | 32°C |
| October | 23°C | 28°C | 33°C |
| November | 17°C | 26°C | 33°C |
| December | 16°C | 20°C | 23°C |
Lake Murray: Water Temperature by Location
Lake Murray: Weather Forecast
July 22
July 23
July 24
July 25
July 26
Location & Local Information
Lake Murray in San Diego, California, experiences noticeable seasonal variation in surface water temperature. In winter months the surface often cools to roughly 50–60°F (10–15°C). Spring brings a gradual rise, with typical surface readings in the neighborhood of 55–68°F (13–20°C) as sunnier days warm the shallows. Peak warmth arrives in summer, when surface temperatures commonly reach about 70–80°F (21–27°C), especially in sheltered, shallow areas; deeper water remains cooler. Autumn sees a gradual decline back toward 60–75°F (16–24°C) as evening temperatures drop and inflows change. Local weather, wind, and reservoir level can shift these ranges, and short-term conditions may vary after heavy rain or prolonged heat.
Swimming at Lake Murray is generally not permitted. The reservoir is part of the regional water supply and managers restrict direct human contact to help protect water quality; safety concerns such as variable depths, submerged hazards, and limited lifeguard coverage are additional reasons for prohibitions. Visitors can still enjoy shoreline trails, picnicking, fishing, and non-motorized boating in designated areas where allowed, but anyone planning to enter the water should consult current signage and local authorities because rules and enforcement are maintained to safeguard public health and the reservoir’s role in supplying potable water.