Clear Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Clear Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Clear Lake today is 19.3°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 |
|---|---|---|---|
| SEP 14 | 19.9°C | 19.5°C | |
| SEP 15 | 19.9°C | 19.5°C | |
| SEP 16 | 20.1°C | 19.5°C | |
| SEP 17 | 19.5°C | 19.5°C | |
| SEP 18 | 19.5°C | 19.5°C | |
| SEP 19 | 18.9°C | 19.5°C | |
| SEP 20 | 19.4°C | 19.5°C | |
| SEP 21 | 19.3°C | 19.5°C | |
| SEP 22 | 19.5°C | 19.3°C | |
| SEP 23 | 19.5°C | 19.3°C | |
| SEP 24 | 19.5°C | 19.3°C | |
| SEP 25 | 19.5°C | 19.3°C | |
| SEP 26 | 19.5°C | 19.4°C | |
| SEP 27 | 19.5°C | 19.4°C | |
| SEP 28 | 19.5°C | 19.4°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 | 2°C | 4°C |
| February | 0°C | 3°C | 6°C |
| March | 1°C | 4°C | 7°C |
| April | 2°C | 7°C | 13°C |
| May | 11°C | 15°C | 20°C |
| June | 15°C | 20°C | 24°C |
| July | 14°C | 20°C | 26°C |
| August | 21°C | 24°C | 27°C |
| September | 15°C | 20°C | 24°C |
| October | 10°C | 15°C | 19°C |
| November | 3°C | 7°C | 11°C |
| December | 1°C | 4°C | 6°C |
Clear Lake: Water Temperature by Location
Clear Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Clear Lake in Washington typically has cool water through most of the year, with surface temperatures varying by season and by bay or depth. In late spring and early fall, surface temperatures are commonly in the 40–60°F range (4–15°C). At the height of summer, especially in shallow areas and during prolonged warm spells, surface readings can climb into the 60–75°F range (15–24°C), though deep or shaded spots remain appreciably colder. In winter the lake surface frequently approaches near-freezing conditions, often around 33–40°F (1–4°C) and may develop ice in especially cold years. Thermal stratification means deeper water stays colder than the surface even in summer.
Swimming is generally permitted and is a popular seasonal activity when surface temperatures are highest, but swimmers should expect brisk water and plan accordingly. Cold-water shock and rapid loss of body heat are real hazards once water is below roughly 70°F (21°C), so limiting immersion time, wearing a wetsuit, and supervising weaker swimmers are sensible precautions. Local health advisories or temporary closures can occur for algal blooms, bacterial contamination, or unsafe conditions, and many lake access points lack lifeguards, so checking current conditions and exercising standard water-safety practices is recommended before entering the water.