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 16°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 |
|---|---|---|---|
| SEP 14 | 17.7°C | 19.5°C | |
| SEP 15 | 16.7°C | 19.5°C | |
| SEP 16 | 16.7°C | 19.5°C | |
| SEP 17 | 15.3°C | 19.5°C | |
| SEP 18 | 15.4°C | 19.5°C | |
| SEP 19 | 16.1°C | 19.5°C | |
| SEP 20 | 15.6°C | 19.5°C | |
| SEP 21 | 16.0°C | 19.5°C | |
| SEP 22 | 19.5°C | 16.2°C | |
| SEP 23 | 19.5°C | 16.4°C | |
| SEP 24 | 19.5°C | 16.5°C | |
| SEP 25 | 19.5°C | 16.7°C | |
| SEP 26 | 19.5°C | 16.9°C | |
| SEP 27 | 19.5°C | 17.1°C | |
| SEP 28 | 19.5°C | 17.2°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 | 3°C | 5°C |
| March | 0°C | 2°C | 4°C |
| April | 1°C | 6°C | 10°C |
| May | 3°C | 11°C | 19°C |
| June | 14°C | 21°C | 27°C |
| July | 19°C | 23°C | 27°C |
| August | 20°C | 24°C | 28°C |
| September | 16°C | 20°C | 23°C |
| October | 6°C | 12°C | 18°C |
| November | 3°C | 7°C | 11°C |
| December | 0°C | 5°C | 9°C |
Round Lake: Water Temperature by Location
Round Lake: Weather Forecast
September 22
September 23
September 24
September 25
Location & Local Information
Round Lake in Minnesota follows the seasonal pattern typical of small inland lakes in the region. During winter the surface is usually at or very near freezing, around 32°F (0°C) under ice; spring thaw brings temperatures up into the 40s to low 60s °F (about 4–16°C) as the water stratifies. By midsummer surface temperatures commonly range from the mid‑60s to high‑70s °F (18–26°C), with sheltered shallows warming fastest and occasional hot spells pushing temperatures into the low 80s °F (around 27–28°C). In autumn the lake cools again, generally settling into the mid‑40s to low‑60s °F (7–16°C) before refreezing. Actual readings vary with depth, weather, and wind; deeper water remains colder even in summer.
Swimming is typically possible and popular during the ice‑free months because temperatures warm enough for recreational use and public access points are often available. Local rules, posted signage and beach closures for water‑quality reasons can affect whether swimming is permitted at specific spots, so checking current advisories is important. Cold water below roughly 70°F (21°C) can feel brisk to many swimmers and increases hypothermia risk after extended exposure, and winter ice cover makes swimming hazardous except in organized, supervised events with safety measures in place.