Round Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Round Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Round Lake today is 25.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 75°F (23°C) to 79°F (26°C). This is a very comfortable temperature for swimming, and many people can enjoy prolonged stays in the water without feeling cold. The water is pleasantly warm, making it ideal for relaxation and water sports. This temperature range is particularly popular among tourists, as it combines comfort and safety for health. 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 | 23.0°C | 23.0°C | |
| JUL 15 | 25.2°C | 23.0°C | |
| JUL 16 | 25.5°C | 23.0°C | |
| JUL 17 | 25.6°C | 23.0°C | |
| JUL 18 | 25.7°C | 23.0°C | |
| JUL 19 | 25.7°C | 23.0°C | |
| JUL 20 | 25.5°C | 23.0°C | |
| JUL 21 | 25.5°C | 23.0°C | |
| JUL 22 | 23.0°C | 25.4°C | |
| JUL 23 | 23.0°C | 25.3°C | |
| JUL 24 | 23.0°C | 25.1°C | |
| JUL 25 | 23.0°C | 25.0°C | |
| JUL 26 | 23.0°C | 24.9°C | |
| JUL 27 | 23.0°C | 24.8°C | |
| JUL 28 | 23.0°C | 24.6°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 | 3°C | 5°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 3°C | 7°C |
| April | 1°C | 6°C | 11°C |
| May | 7°C | 13°C | 18°C |
| June | 13°C | 17°C | 21°C |
| July | 19°C | 23°C | 27°C |
| August | 18°C | 24°C | 30°C |
| September | 14°C | 16°C | 19°C |
| October | 9°C | 14°C | 18°C |
| November | 3°C | 9°C | 13°C |
| December | 0°C | 3°C | 7°C |
Round Lake: Water Temperature by Location
Round Lake: Weather Forecast
July 22
July 23
July 24
July 25
July 26
July 27
Location & Local Information
Round Lake in Wisconsin typically follows the seasonal temperature patterns of small inland lakes in the region. After ice-out in spring, surface water commonly ranges from about 40–55°F (4–13°C) as air temperatures warm and runoff cools the lake. In midsummer the surface often rises to roughly 70–80°F (21–27°C) on warm, sunny days, with the warmest water in shallow bays and nearshore areas. By fall the surface cools back into the 50–65°F (10–18°C) band as nights lengthen and mixing increases. In winter the lake is usually at or near freezing at the surface, often covered by ice, while deeper water remains closer to the density-driven temperature near 39°F (4°C).
Swimming is generally permitted at Round Lake where public access points and beaches exist, and people commonly swim during the warmer months when surface temperatures are most comfortable. Whether swimming is advisable depends on conditions: water quality advisories, blue-green algae blooms, currents, weather and ice cover can limit safe access. Lifeguards are not always present, so swimmers should heed local notices, avoid cold-water immersion outside summer, and be mindful that temperatures below the mid‑60s°F (around 18°C) can feel brisk and increase risk of hypothermia.