H. V. Eastman Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in H. V. Eastman Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in H. V. Eastman Lake today is 30.3°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 9 | 30.9°C | 27.3°C | |
| AUG 10 | 31.6°C | 27.3°C | |
| AUG 11 | 31.6°C | 27.3°C | |
| AUG 12 | 31.6°C | 27.3°C | |
| AUG 13 | 31.5°C | 27.3°C | |
| AUG 14 | 31.4°C | 27.3°C | |
| AUG 15 | 31.4°C | 27.3°C | |
| AUG 17 | 27.3°C | 30.2°C | |
| AUG 18 | 27.3°C | 30.0°C | |
| AUG 19 | 27.3°C | 29.9°C | |
| AUG 20 | 27.3°C | 29.7°C | |
| AUG 21 | 27.3°C | 29.6°C | |
| AUG 22 | 27.3°C | 29.4°C | |
| AUG 23 | 27.3°C | 29.3°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 | 8°C | 11°C | 13°C |
| February | 6°C | 10°C | 14°C |
| March | 9°C | 14°C | 20°C |
| April | 11°C | 15°C | 20°C |
| May | 15°C | 20°C | 24°C |
| June | 21°C | 24°C | 27°C |
| July | 23°C | 27°C | 31°C |
| August | 23°C | 27°C | 32°C |
| September | 22°C | 27°C | 31°C |
| October | 19°C | 22°C | 25°C |
| November | 12°C | 17°C | 21°C |
| December | 10°C | 12°C | 15°C |
H. V. Eastman Lake: Water Temperature by Location
H. V. Eastman Lake: Weather Forecast
August 16
August 17
August 18
August 19
August 20
Location & Local Information
H. V. Eastman Lake, like many foothill reservoirs in central California, shows marked seasonal variation in surface water temperature. In winter months surface readings commonly fall roughly between 45 and 55 °F (7–13 °C), while spring brings a gradual rise into the 50–65 °F (10–18 °C) range. By midsummer the shallow, sun-warmed areas can reach about 70–85 °F (21–29 °C), with late-summer lows around 60–75 °F (16–24 °C) as nights cool. These values vary with weather, inflows, and depth: deeper water remains substantially colder than the surface, and cold inflowing streams or releases from reservoirs upstream can depress temperatures even in summer.
Swimming is generally permitted in recreation areas around Eastman Lake, but it is typically confined to designated zones and subject to local rules and posted signage because of hazards such as sudden drop-offs, submerged debris, boat traffic, and water-quality considerations. Cold water, even when surface temperatures feel warm, can increase the risk of cramps or hypothermia, and there are often no lifeguards on duty. For safe swimming, use marked areas during warmer months, avoid swimming near boat ramps or intakes, and heed any current advisories or restrictions issued by park authorities.