Big Round Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Big Round Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Big Round Lake today is 21.6°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 | 17.4°C | 21.5°C | |
| JUN 4 | 17.7°C | 21.5°C | |
| JUN 5 | 17.7°C | 21.5°C | |
| JUN 6 | 18.5°C | 21.5°C | |
| JUN 7 | 18.2°C | 21.5°C | |
| JUN 8 | 21.8°C | 21.5°C | |
| JUN 10 | 21.6°C | 21.5°C | |
| JUN 11 | 21.5°C | 21.6°C | |
| JUN 12 | 21.5°C | 21.6°C | |
| JUN 13 | 21.5°C | 21.6°C | |
| JUN 14 | 21.5°C | 21.6°C | |
| JUN 15 | 21.5°C | 21.6°C | |
| JUN 16 | 21.5°C | 21.6°C | |
| JUN 17 | 21.5°C | 21.6°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 | 4°C |
| February | 0°C | 2°C | 4°C |
| March | 0°C | 2°C | 4°C |
| April | 2°C | 7°C | 12°C |
| May | 9°C | 15°C | 20°C |
| June | 16°C | 22°C | 27°C |
| July | 21°C | 24°C | 27°C |
| August | 20°C | 24°C | 28°C |
| September | 18°C | 21°C | 23°C |
| October | 6°C | 13°C | 19°C |
| November | 2°C | 7°C | 12°C |
| December | 1°C | 3°C | 6°C |
Big Round Lake: Water Temperature by Location
Big Round Lake: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Big Round Lake in Wisconsin follows the seasonal patterns typical of northern glacial lakes. In winter the surface freezes and water at the ice interface is close to 32°F (0°C) while deeper water remains near 39°F (4°C). During spring the surface warms from roughly 40–55°F (4–13°C) as ice-out progresses. By summer, surface temperatures commonly reach the mid-60s to upper-70s °F, roughly 18–27°C, with the warmest, swim‑friendly conditions usually occurring in July and August. In autumn the surface cools back into the 50–60°F (10–16°C) range before freeze-up; actual temperatures vary year to year depending on air temperature, depth, and wind.
Swimming at Big Round Lake is generally permitted and popular in summer because of those warm surface temperatures and accessible shoreline. There are no intrinsic legal restrictions on swimming in most parts of Wisconsin inland lakes, but conditions can make swimming unsafe at times: ice cover in winter, cold water in spring and fall that can cause cold‑water shock, and occasional water‑quality advisories for algal blooms or bacterial contamination. Visitors should use designated public access points or beaches where available, heed posted advisories, and recognize that lifeguards are not typically provided on small lakes.