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 28.3°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 |
|---|---|---|---|
| JUL 14 | 25.3°C | 26.0°C | |
| JUL 15 | 28.0°C | 26.0°C | |
| JUL 16 | 28.0°C | 26.0°C | |
| JUL 17 | 28.0°C | 26.0°C | |
| JUL 18 | 28.1°C | 26.0°C | |
| JUL 19 | 28.0°C | 26.0°C | |
| JUL 20 | 27.8°C | 26.0°C | |
| JUL 21 | 27.8°C | 26.0°C | |
| JUL 22 | 26.0°C | 28.2°C | |
| JUL 23 | 26.0°C | 28.1°C | |
| JUL 24 | 26.0°C | 28.0°C | |
| JUL 25 | 26.0°C | 27.8°C | |
| JUL 26 | 26.0°C | 27.7°C | |
| JUL 27 | 26.0°C | 27.6°C | |
| JUL 28 | 26.0°C | 27.5°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 | 5°C | 8°C | 11°C |
| February | 5°C | 8°C | 11°C |
| March | 6°C | 11°C | 16°C |
| April | 11°C | 14°C | 17°C |
| May | 15°C | 20°C | 24°C |
| June | 20°C | 25°C | 30°C |
| July | 23°C | 26°C | 29°C |
| August | 24°C | 26°C | 29°C |
| September | 22°C | 25°C | 28°C |
| October | 16°C | 20°C | 23°C |
| November | 11°C | 15°C | 18°C |
| December | 6°C | 10°C | 13°C |
Clear Lake: Water Temperature by Location
Clear Lake: Weather Forecast
July 22
July 23
July 24
July 25
July 26
Location & Local Information
Clear Lake in Northern California experiences noticeable seasonal swings in surface water temperature because it is relatively shallow and responds quickly to air temperature. In winter the surface commonly ranges from about 42–55°F (6–13°C). Spring warming typically produces temperatures near 52–65°F (11–18°C). Peak summer surface temperatures often sit between 68–80°F (20–27°C), with occasional warm spells pushing readings into the low 80s°F (around 28°C). During fall the water usually cools back into the 60–72°F (16–22°C) band as air temperatures drop. Deeper or wind‑cooled areas can be several degrees cooler than surface readings, and local conditions such as recent weather, depth, and inflows will affect exact values.
Swimming at Clear Lake is generally allowed and many people swim from parks and private shorelines, but opportunities are conditioned by safety and water quality. Recreational use is sometimes restricted when harmful algal blooms (cyanobacteria) occur—these blooms can produce toxins that make contact or ingestion unsafe—so authorities issue advisories or close access when necessary. Cold water in shoulder seasons presents hypothermia risk as well. In short, swimming is possible much of the year in warmer months, but checking current local water‑quality advisories and observing conditions before entering is important.