Lake Eau Claire — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Eau Claire, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Eau Claire today is 18.6°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 | 19.3°C | 18.6°C | |
| SEP 15 | 18.3°C | 18.6°C | |
| SEP 16 | 18.3°C | 18.6°C | |
| SEP 17 | 18.5°C | 18.6°C | |
| SEP 18 | 17.8°C | 18.6°C | |
| SEP 19 | 18.3°C | 18.6°C | |
| SEP 20 | 18.1°C | 18.6°C | |
| SEP 22 | 18.6°C | 18.6°C | |
| SEP 23 | 18.6°C | 18.6°C | |
| SEP 24 | 18.6°C | 18.6°C | |
| SEP 25 | 18.6°C | 18.6°C | |
| SEP 26 | 18.6°C | 18.6°C | |
| SEP 27 | 18.6°C | 18.6°C | |
| SEP 28 | 18.6°C | 18.6°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 | 3°C |
| February | 0°C | 1°C | 3°C |
| March | 0°C | 2°C | 5°C |
| April | 1°C | 8°C | 15°C |
| May | 8°C | 15°C | 22°C |
| June | 15°C | 19°C | 23°C |
| July | 20°C | 24°C | 28°C |
| August | 20°C | 25°C | 30°C |
| September | 14°C | 19°C | 24°C |
| October | 9°C | 14°C | 18°C |
| November | 2°C | 8°C | 12°C |
| December | 0°C | 2°C | 4°C |
Lake Eau Claire: Water Temperature by Location
Lake Eau Claire: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Lake Eau Claire, a reservoir in western Wisconsin, experiences pronounced seasonal shifts in water temperature. In spring the surface typically warms from roughly 40–60°F (4–16°C) as ice melts and runoff cools the upper layers. By summer the surface commonly reaches about 68–78°F (20–26°C) on warm days, though shallow bays can warm more and deeper water stays noticeably cooler. In early fall temperatures usually fall back into the 45–65°F (7–18°C) range as air temperatures drop and stratification breaks down. In winter the lake is often at or near freezing at the surface, roughly 32–40°F (0–4°C), with ice cover common across colder months; subsurface water remains somewhat warmer but still cold compared with summer.
Swimming at Lake Eau Claire is generally allowed in designated recreation areas because the lake is managed for public use and provides shoreline access and picnic and beach facilities at some county-managed sites. However, conditions vary: there may be no lifeguards, water quality advisories such as algal blooms can temporarily restrict swimming, and colder temperatures or ice make swimming unsafe outside the summer season. Always use marked swimming zones, heed posted advisories, and remember that surface readings do not reflect colder deeper water or rapid changes near inlets and drop-offs.