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 24.6°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 |
|---|---|---|---|
| AUG 5 | 27.9°C | 24.2°C | |
| AUG 6 | 27.8°C | 24.2°C | |
| AUG 7 | 27.8°C | 24.2°C | |
| AUG 8 | 27.8°C | 24.2°C | |
| AUG 9 | 27.8°C | 24.2°C | |
| AUG 10 | 26.7°C | 24.2°C | |
| AUG 11 | 24.6°C | 24.2°C | |
| AUG 13 | 24.2°C | 24.6°C | |
| AUG 14 | 24.2°C | 24.6°C | |
| AUG 15 | 24.2°C | 24.5°C | |
| AUG 16 | 24.2°C | 24.5°C | |
| AUG 17 | 24.2°C | 24.5°C | |
| AUG 18 | 24.2°C | 24.5°C | |
| AUG 19 | 24.2°C | 24.5°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 | 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 | 29°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
August 12
August 13
August 14
August 15
August 16
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.