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 26.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. 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 |
|---|---|---|---|
| AUG 4 | 25.9°C | 24.5°C | |
| AUG 5 | 25.9°C | 24.5°C | |
| AUG 6 | 26.1°C | 24.5°C | |
| AUG 7 | 26.1°C | 24.5°C | |
| AUG 8 | 26.4°C | 24.5°C | |
| AUG 9 | 26.4°C | 24.5°C | |
| AUG 10 | 26.5°C | 24.5°C | |
| AUG 11 | 26.5°C | 24.5°C | |
| AUG 12 | 24.5°C | 26.4°C | |
| AUG 13 | 24.5°C | 26.3°C | |
| AUG 14 | 24.5°C | 26.2°C | |
| AUG 15 | 24.5°C | 26.1°C | |
| AUG 16 | 24.5°C | 26.0°C | |
| AUG 17 | 24.5°C | 25.9°C | |
| AUG 18 | 24.5°C | 25.8°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 | 23°C |
| July | 20°C | 25°C | 30°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
August 12
August 13
August 14
August 15
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.