Lake Terrell — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Terrell, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Terrell today is 18.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 | 19.7°C | 23.5°C | |
| AUG 25 | 19.4°C | 23.5°C | |
| AUG 26 | 19.4°C | 23.5°C | |
| AUG 27 | 19.4°C | 23.5°C | |
| AUG 28 | 19.3°C | 23.5°C | |
| AUG 29 | 19.0°C | 23.5°C | |
| AUG 30 | 19.2°C | 23.5°C | |
| AUG 31 | 19.0°C | 23.5°C | |
| SEP 1 | 20.5°C | 18.6°C | |
| SEP 2 | 20.5°C | 18.7°C | |
| SEP 3 | 20.5°C | 18.8°C | |
| SEP 4 | 20.5°C | 18.9°C | |
| SEP 5 | 20.5°C | 19.0°C | |
| SEP 6 | 20.5°C | 19.1°C | |
| SEP 7 | 20.5°C | 19.2°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 | 4°C | 8°C |
| February | 1°C | 5°C | 8°C |
| March | 5°C | 8°C | 11°C |
| April | 6°C | 11°C | 15°C |
| May | 10°C | 16°C | 21°C |
| June | 13°C | 19°C | 24°C |
| July | 15°C | 23°C | 31°C |
| August | 17°C | 24°C | 30°C |
| September | 15°C | 21°C | 26°C |
| October | 10°C | 15°C | 20°C |
| November | 6°C | 10°C | 14°C |
| December | 4°C | 7°C | 9°C |
Lake Terrell: Water Temperature by Location
Lake Terrell: Weather Forecast
September 1
September 2
September 3
September 4
September 5
September 6
Location & Local Information
Lake Terrell does not have widely published year‑round monitoring data, so the following reflects typical conditions for small inland lakes in Washington. Surface temperatures usually run cool in spring and fall, roughly 40–55°F (4–13°C) in spring and 45–60°F (7–16°C) in fall as the lake mixes and cools. In summer, shallow areas can warm to about 55–75°F (13–24°C) on sunny, low‑elevation sites; deeper water stays considerably colder. Winter temperatures often hover near freezing at the surface in the coldest months, roughly 33–45°F (1–7°C), especially at higher elevations or under icy conditions.
Swimming at Lake Terrell is typically allowed where public access exists, but conditions and safety vary. Recreational swimming is most practical in mid to late summer when surface water reaches the warmer end of the range, yet even 60–65°F (15–18°C) can feel brisk and carry a risk of cold‑water shock or hypothermia. Local rules, beach postings, water‑quality advisories (such as algal blooms), and private property restrictions can prohibit or limit swimming at times, so it’s prudent to check with county parks or landowners and observe posted warnings before entering the water.