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 19.9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 | 20.0°C | 20.6°C | |
| SEP 15 | 20.3°C | 20.6°C | |
| SEP 16 | 20.8°C | 20.6°C | |
| SEP 17 | 18.5°C | 20.6°C | |
| SEP 18 | 18.9°C | 20.6°C | |
| SEP 19 | 19.7°C | 20.6°C | |
| SEP 20 | 19.8°C | 20.6°C | |
| SEP 21 | 19.9°C | 20.6°C | |
| SEP 22 | 20.6°C | 19.9°C | |
| SEP 23 | 20.6°C | 20.0°C | |
| SEP 24 | 20.6°C | 20.0°C | |
| SEP 25 | 20.6°C | 20.0°C | |
| SEP 26 | 20.6°C | 20.1°C | |
| SEP 27 | 20.6°C | 20.1°C | |
| SEP 28 | 20.6°C | 20.1°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 | 2°C | 4°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 3°C | 6°C |
| April | 3°C | 9°C | 14°C |
| May | 11°C | 14°C | 18°C |
| June | 14°C | 18°C | 23°C |
| July | 21°C | 25°C | 29°C |
| August | 20°C | 23°C | 27°C |
| September | 17°C | 21°C | 25°C |
| October | 12°C | 15°C | 18°C |
| November | 7°C | 11°C | 13°C |
| December | 1°C | 6°C | 9°C |
Round Lake: Water Temperature by Location
Round Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Round Lake in upstate New York typically follows the seasonal pattern of small temperate lakes. Surface water temperatures in summer commonly range from about 68–78°F (20–26°C), with the warmest readings late July through August; shallow areas can warm a few degrees above that. In spring and early summer the lake often sits between roughly 40–65°F (4–18°C) as the water stratifies, while autumn sees a similar 45–60°F (7–15°C) decline as cooling begins. During winter the surface approaches freezing, around 32°F (0°C), and subsurface layers generally remain just above freezing, roughly 33–39°F (1–4°C) beneath any ice.
Swimming is typically possible in the warmer months when local authorities or property managers permit access, primarily because water temperatures become comfortable and water quality is monitored. Access and rules vary by shoreline ownership, so some areas may be private or restricted; public spots that allow swimming may not have lifeguards. Cold spring or late-fall water poses hypothermia and cold-shock risks even though it may be allowed, and winter ice makes swimming unsafe and generally prohibited. Visitors should follow posted regulations and recent water-quality advisories before entering.