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 27.7°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. 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 | 26.0°C | 23.8°C | |
| AUG 5 | 26.1°C | 23.8°C | |
| AUG 6 | 26.2°C | 23.8°C | |
| AUG 7 | 26.1°C | 23.8°C | |
| AUG 8 | 26.1°C | 23.8°C | |
| AUG 9 | 26.2°C | 23.8°C | |
| AUG 10 | 27.5°C | 23.8°C | |
| AUG 11 | 27.7°C | 23.8°C | |
| AUG 12 | 23.8°C | 27.5°C | |
| AUG 13 | 23.8°C | 27.3°C | |
| AUG 14 | 23.8°C | 27.1°C | |
| AUG 15 | 23.8°C | 26.9°C | |
| AUG 16 | 23.8°C | 26.7°C | |
| AUG 17 | 23.8°C | 26.5°C | |
| AUG 18 | 23.8°C | 26.3°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 | 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 | 23°C | 27°C |
| August | 20°C | 24°C | 28°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
August 12
August 13
August 14
August 15
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.