Lake Entiat — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Entiat, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Entiat today is 20.3°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 23 | 20.9°C | 16.7°C | |
| JUN 24 | 20.4°C | 16.7°C | |
| JUN 25 | 20.3°C | 16.7°C | |
| JUN 26 | 20.9°C | 16.7°C | |
| JUN 27 | 20.9°C | 16.7°C | |
| JUN 28 | 20.7°C | 16.7°C | |
| JUN 29 | 20.3°C | 16.7°C | |
| JUN 30 | 20.2°C | 16.7°C | |
| JUL 1 | 20.0°C | 20.3°C | |
| JUL 2 | 20.0°C | 20.3°C | |
| JUL 3 | 20.0°C | 20.3°C | |
| JUL 4 | 20.0°C | 20.2°C | |
| JUL 5 | 20.0°C | 20.2°C | |
| JUL 6 | 20.0°C | 20.2°C | |
| JUL 7 | 20.0°C | 20.2°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 | 0°C | 1°C | 4°C |
| February | 0°C | 2°C | 5°C |
| March | 1°C | 4°C | 8°C |
| April | 3°C | 8°C | 13°C |
| May | 7°C | 12°C | 18°C |
| June | 12°C | 17°C | 22°C |
| July | 16°C | 20°C | 24°C |
| August | 20°C | 23°C | 26°C |
| September | 16°C | 19°C | 22°C |
| October | 10°C | 14°C | 18°C |
| November | 5°C | 9°C | 12°C |
| December | 1°C | 4°C | 7°C |
Lake Entiat: Water Temperature by Location
Lake Entiat: Weather Forecast
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Location & Local Information
Lake Entiat, the reservoir on the Columbia River behind Rocky Reach Dam in Washington, experiences a wide range of water temperatures through the year. In winter the surface often sits around 39–45°F (4–7°C), spring typically warms to about 45–59°F (7–15°C), summer surface temperatures in shallow, sun-exposed areas can reach roughly 60–75°F (16–24°C), and fall generally drops back into the 50–60°F (10–16°C) range. These are broad seasonal averages; deeper water and shaded or fast-moving channels remain substantially colder than surface readings, and temperatures can vary with local weather, inflows and reservoir operations.
Recreational swimming is generally allowed at public access sites and parks along Lake Entiat, and the lake is used for swimming, boating and other water recreation. However, swimmers should heed posted rules and avoid restricted zones near the dam, boat ramps and navigation channels. Main concerns are cold-water shock even on warm days, boat traffic, sudden drop-offs and typically limited lifeguard coverage, so using designated swim areas, wearing a life jacket when appropriate and checking local notices before entering the water are important for safety.