Pewaukee Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Pewaukee Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Pewaukee Lake today is 21.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 |
|---|---|---|---|
| JUN 3 | 19.8°C | 19.0°C | |
| JUN 4 | 19.9°C | 19.0°C | |
| JUN 5 | 20.1°C | 19.0°C | |
| JUN 6 | 20.2°C | 19.0°C | |
| JUN 7 | 20.7°C | 19.0°C | |
| JUN 8 | 21.0°C | 19.0°C | |
| JUN 10 | 21.3°C | 19.0°C | |
| JUN 11 | 19.0°C | 21.2°C | |
| JUN 12 | 19.0°C | 21.1°C | |
| JUN 13 | 19.0°C | 21.0°C | |
| JUN 14 | 19.0°C | 20.8°C | |
| JUN 15 | 19.0°C | 20.7°C | |
| JUN 16 | 19.0°C | 20.6°C | |
| JUN 17 | 19.0°C | 20.5°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 | 1°C | 4°C | 7°C |
| February | 1°C | 5°C | 8°C |
| March | 0°C | 3°C | 7°C |
| April | 4°C | 8°C | 13°C |
| May | 7°C | 15°C | 23°C |
| June | 16°C | 19°C | 22°C |
| July | 20°C | 22°C | 25°C |
| August | 22°C | 25°C | 27°C |
| September | 12°C | 17°C | 22°C |
| October | 13°C | 17°C | 20°C |
| November | 0°C | 6°C | 12°C |
| December | 0°C | 3°C | 6°C |
Pewaukee Lake: Water Temperature by Location
Pewaukee Lake: Weather Forecast
June 9
June 10
June 11
June 12
Location & Local Information
Pewaukee Lake experiences a wide annual swing in surface water temperatures reflective of Wisconsin’s continental climate. During winter months the lake commonly approaches freezing, roughly 32–40°F (0–4°C), and often develops ice cover. Spring brings a steady rise, with surface temperatures typically moving from about 35–60°F (2–16°C) as the water mixes and warms. In summer the lake is most comfortable for swimmers, with surface temperatures generally in the 70–80°F range (21–27°C) on warm days, though heat waves can push parts of the littoral zone slightly higher. By fall the water cools again, usually falling to roughly 50–65°F (10–18°C) as air temperatures drop and stratification breaks down.
Swimming in Pewaukee Lake is commonly permitted and practiced, particularly at public beaches and designated swim areas during the warmer months when surface temperatures are suitable and lifeguards or beach management are present. Local authorities may close or issue advisories for swimming for public-health reasons, such as elevated bacteria or harmful algal blooms, so conditions are monitored. In colder seasons open-water swimming is uncommon because of low temperatures and ice cover; some people do cold-water or winter swims with appropriate safety measures, but routine swimming is seasonal and depends on water temperature, safety infrastructure, and water-quality advisories.