Puddingstone Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Puddingstone Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Puddingstone Reservoir today is 30.7°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 24 | 29.1°C | 29.1°C | |
| AUG 25 | 29.3°C | 29.1°C | |
| AUG 26 | 29.3°C | 29.1°C | |
| AUG 27 | 30.3°C | 29.1°C | |
| AUG 28 | 30.2°C | 29.1°C | |
| AUG 29 | 30.4°C | 29.1°C | |
| AUG 30 | 30.4°C | 29.1°C | |
| AUG 31 | 30.7°C | 29.1°C | |
| SEP 1 | 28.3°C | 30.6°C | |
| SEP 2 | 28.3°C | 30.5°C | |
| SEP 3 | 28.3°C | 30.3°C | |
| SEP 4 | 28.3°C | 30.2°C | |
| SEP 5 | 28.3°C | 30.1°C | |
| SEP 6 | 28.3°C | 30.0°C | |
| SEP 7 | 28.3°C | 29.9°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 | 13°C | 18°C |
| February | 10°C | 14°C | 18°C |
| March | 11°C | 16°C | 22°C |
| April | 16°C | 20°C | 23°C |
| May | 20°C | 23°C | 27°C |
| June | 20°C | 24°C | 28°C |
| July | 26°C | 31°C | 35°C |
| August | 26°C | 29°C | 33°C |
| September | 26°C | 28°C | 31°C |
| October | 21°C | 24°C | 27°C |
| November | 16°C | 20°C | 23°C |
| December | 13°C | 16°C | 18°C |
Puddingstone Reservoir: Water Temperature by Location
Puddingstone Reservoir: Weather Forecast
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Location & Local Information
Puddingstone Reservoir, in Bonelli Regional Park near San Dimas, experiences typical Southern California seasonal surface temperatures that influence recreational use. Winter surface temperatures commonly fall into the mid-40s to mid-50s °F (about 7–13 °C), spring warms into the mid-50s to mid-60s °F (13–18 °C), summer surface readings often range from the upper 60s into the upper 70s °F (20–26 °C) and on hot days can approach 80 °F (about 27 °C), while autumn generally cools back into the low 60s to low 70s °F (16–22 °C). These are surface values and can vary from year to year; deeper water remains substantially colder year-round, and wind, inflow, and sunlight affect short-term swings.
Swimming in the main body of Puddingstone Reservoir is generally restricted by park authorities for reasons of safety, boat traffic, and water-quality management, although the park operates designated and supervised swim areas or events at times when conditions and permits allow. When open, those areas are monitored and intended to separate swimmers from motorized craft and to reduce exposure to variable water quality. Even in supervised zones, colder water below the surface and sudden temperature changes can pose risks, so anglers, paddlers, and would-be swimmers should check current park rules and advisories before entering the water.