Cossayuna Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Cossayuna Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Cossayuna Lake today is 18.3°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 |
|---|---|---|---|
| JUN 3 | 14.8°C | 17.7°C | |
| JUN 4 | 15.5°C | 17.7°C | |
| JUN 5 | 16.1°C | 17.7°C | |
| JUN 6 | 16.5°C | 17.7°C | |
| JUN 7 | 17.6°C | 17.7°C | |
| JUN 8 | 17.6°C | 17.7°C | |
| JUN 11 | 17.7°C | 18.3°C | |
| JUN 12 | 17.7°C | 18.2°C | |
| JUN 13 | 17.7°C | 18.2°C | |
| JUN 14 | 17.7°C | 18.2°C | |
| JUN 15 | 17.7°C | 18.2°C | |
| JUN 16 | 17.7°C | 18.1°C | |
| JUN 17 | 17.7°C | 18.1°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 | 1°C | 3°C | 6°C |
| April | 2°C | 8°C | 13°C |
| May | 10°C | 14°C | 17°C |
| June | 14°C | 18°C | 21°C |
| July | 20°C | 25°C | 29°C |
| August | 20°C | 23°C | 25°C |
| September | 18°C | 20°C | 22°C |
| October | 11°C | 15°C | 18°C |
| November | 6°C | 10°C | 13°C |
| December | 1°C | 5°C | 8°C |
Cossayuna Lake: Water Temperature by Location
Cossayuna Lake: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Cossayuna Lake, a modest inland lake in upstate New York, experiences a wide seasonal range in surface water temperatures. In spring the lake typically warms from around 45–65°F (7–18°C) as air temperatures rise and snowmelt runs off into the basin. Summer surface temperatures commonly reach roughly 70–80°F (21–27°C), and on hot, calm afternoons small shallow bays can rise toward the mid‑80s°F (about 29°C). During fall the water cools back into the 50s–60s°F (10–16°C) as cooler nights return, and in winter the lake commonly freezes or hovers near freezing with near‑surface water around 32–36°F (0–2°C) beneath any ice. Deeper water remains colder year‑round, and actual temperatures vary with depth, weather patterns, and year‑to‑year conditions.
Swimming on Cossayuna Lake is generally permitted and is a common recreational use for residents and visitors, because the lake has shore access at private properties and public launch areas; however, there may be no staffed beaches or lifeguards. Users should follow local signage and health advisories because warm weather can bring weeds or harmful algal blooms that make swimming unsafe, and cold or variable temperatures pose risks such as cold‑water shock. For safe swimming, check current local water quality guidance, supervise children, and use flotation devices when appropriate.