Lake Wausau — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Wausau, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Wausau today is 18.1°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 | 19.0°C | 18.0°C | |
| SEP 15 | 18.9°C | 18.0°C | |
| SEP 16 | 18.9°C | 18.0°C | |
| SEP 17 | 18.8°C | 18.0°C | |
| SEP 18 | 18.5°C | 18.0°C | |
| SEP 19 | 18.7°C | 18.0°C | |
| SEP 20 | 18.8°C | 18.0°C | |
| SEP 21 | 18.1°C | 18.0°C | |
| SEP 22 | 18.0°C | 18.1°C | |
| SEP 23 | 18.0°C | 18.1°C | |
| SEP 24 | 18.0°C | 18.1°C | |
| SEP 25 | 18.0°C | 18.1°C | |
| SEP 26 | 18.0°C | 18.1°C | |
| SEP 27 | 18.0°C | 18.1°C | |
| SEP 28 | 18.0°C | 18.1°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 | 2°C | 4°C |
| March | 0°C | 2°C | 5°C |
| April | 1°C | 8°C | 15°C |
| May | 7°C | 13°C | 20°C |
| June | 16°C | 19°C | 22°C |
| July | 18°C | 23°C | 28°C |
| August | 18°C | 25°C | 30°C |
| September | 14°C | 18°C | 22°C |
| October | 9°C | 14°C | 18°C |
| November | 4°C | 9°C | 14°C |
| December | 0°C | 3°C | 6°C |
Lake Wausau: Water Temperature by Location
Lake Wausau: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Lake Wausau, a reservoir on the Wisconsin River in Wausau, experiences noticeable seasonal swings in surface water temperature. In spring the surface typically warms from roughly 40–60°F (4–15°C) as ice melts and runoff continues. Summer brings the warmest conditions, with near-shore temperatures commonly reaching about 68–78°F (20–26°C) on sunny days, though deeper or faster-moving sections remain cooler. During autumn the surface cools again, often ranging from about 45–65°F (7–18°C) as air temperatures drop and stratification breaks down. In winter the lake is frequently at or just above freezing beneath any ice cover, roughly 32–39°F (0–4°C) at the surface in iced conditions, while unfrozen flowing areas can be a few degrees warmer. Local factors such as depth, shading, wind, and river current cause site-to-site variation.
Swimming is generally permitted at public access points and recreational areas around Lake Wausau because the lake is used for boating, fishing and other shoreline recreation, but conditions and rules can vary by site. Water temperature and currents are important safety considerations: summer temperatures are comfortable for most swimmers, while cold spring, fall, or icy winter waters increase the risk of cold shock and hypothermia. Visitors should heed posted advisories, be aware that many accesses are unguarded, and check local water-quality information and seasonal restrictions before entering the water.