San Pablo Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in San Pablo Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in San Pablo Reservoir today is 20.9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 |
|---|---|---|---|
| JUN 2 | 20.5°C | 21.1°C | |
| JUN 3 | 20.1°C | 21.1°C | |
| JUN 4 | 20.4°C | 21.1°C | |
| JUN 5 | 20.7°C | 21.1°C | |
| JUN 6 | 20.6°C | 21.1°C | |
| JUN 7 | 21.3°C | 21.1°C | |
| JUN 8 | 20.9°C | 21.1°C | |
| JUN 10 | 21.1°C | 20.9°C | |
| JUN 11 | 21.1°C | 20.9°C | |
| JUN 12 | 21.1°C | 20.9°C | |
| JUN 13 | 21.1°C | 20.9°C | |
| JUN 14 | 21.1°C | 21.0°C | |
| JUN 15 | 21.1°C | 21.0°C | |
| JUN 16 | 21.1°C | 21.0°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 | 11°C | 15°C | 19°C |
| February | 11°C | 15°C | 19°C |
| March | 12°C | 16°C | 21°C |
| April | 15°C | 18°C | 21°C |
| May | 17°C | 20°C | 23°C |
| June | 19°C | 21°C | 24°C |
| July | 19°C | 22°C | 24°C |
| August | 20°C | 22°C | 25°C |
| September | 19°C | 21°C | 24°C |
| October | 19°C | 21°C | 24°C |
| November | 13°C | 18°C | 22°C |
| December | 10°C | 16°C | 20°C |
San Pablo Reservoir: Water Temperature by Location
San Pablo Reservoir: Weather Forecast
June 9
June 10
June 11
June 12
Location & Local Information
San Pablo Reservoir, located in Contra Costa County, typically has cool water year-round with noticeable seasonal variation and stratification. Surface temperatures in winter usually sit around 45–55°F (7–13°C), warming through spring to roughly 50–60°F (10–16°C). In the warmest months the surface can reach about 60–75°F (15–24°C), while deeper water remains substantially colder. Fall temperatures commonly span 55–70°F (13–21°C) as the surface gradually cools. Because the reservoir is relatively deep and shaded in places, thermal layering can create markedly colder conditions below the surface, and releases from lower depths at the dam may be cooler than surface readings.
Swimming is not permitted at San Pablo Reservoir. The East Bay Municipal Utility District manages the site as part of the regional water supply, and prohibitions on swimming are intended to protect water quality and public safety. In addition to safeguarding the drinking water source, restrictions address hazards such as cold water shock, steep drop-offs, submerged obstacles, and boat traffic. Recreational uses that are allowed under EBMUD rules include fishing, non-motorized and limited motorized boating in designated areas, and shore-based activities, but there are no official swim beaches or lifeguarded swim zones at the reservoir.