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 24.2°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health. 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 | 24.6°C | 23.0°C | |
| AUG 5 | 24.6°C | 23.0°C | |
| AUG 6 | 24.6°C | 23.0°C | |
| AUG 7 | 24.2°C | 23.0°C | |
| AUG 8 | 24.0°C | 23.0°C | |
| AUG 9 | 25.8°C | 23.0°C | |
| AUG 10 | 24.2°C | 23.0°C | |
| AUG 11 | 24.1°C | 23.0°C | |
| AUG 12 | 23.0°C | 24.1°C | |
| AUG 13 | 23.0°C | 24.1°C | |
| AUG 14 | 23.0°C | 24.0°C | |
| AUG 15 | 23.0°C | 24.0°C | |
| AUG 16 | 23.0°C | 23.9°C | |
| AUG 17 | 23.0°C | 23.8°C | |
| AUG 18 | 23.0°C | 23.8°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 | 21°C | 26°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
August 12
August 13
August 14
August 15
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.