Cannonsville Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Cannonsville Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Cannonsville Reservoir today is 18.2°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 2 | 16.0°C | 18.0°C | |
| JUN 3 | 15.0°C | 18.0°C | |
| JUN 4 | 15.2°C | 18.0°C | |
| JUN 5 | 15.6°C | 18.0°C | |
| JUN 6 | 16.7°C | 18.0°C | |
| JUN 7 | 17.5°C | 18.0°C | |
| JUN 8 | 17.2°C | 18.0°C | |
| JUN 10 | 18.0°C | 18.2°C | |
| JUN 11 | 18.0°C | 18.2°C | |
| JUN 12 | 18.0°C | 18.2°C | |
| JUN 13 | 18.0°C | 18.2°C | |
| JUN 14 | 18.0°C | 18.2°C | |
| JUN 15 | 18.0°C | 18.1°C | |
| JUN 16 | 18.0°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 | 5°C |
| February | 0°C | 1°C | 4°C |
| March | 0°C | 4°C | 7°C |
| April | 4°C | 8°C | 13°C |
| May | 9°C | 13°C | 18°C |
| June | 14°C | 18°C | 22°C |
| July | 18°C | 24°C | 30°C |
| August | 18°C | 24°C | 29°C |
| September | 16°C | 22°C | 27°C |
| October | 10°C | 14°C | 17°C |
| November | 5°C | 9°C | 12°C |
| December | 0°C | 4°C | 6°C |
Cannonsville Reservoir: Water Temperature by Location
Cannonsville Reservoir: Weather Forecast
June 9
June 10
June 11
June 12
Location & Local Information
Cannonsville Reservoir, part of New York City’s Delaware system in upstate New York, has water temperatures that vary widely through the year and with depth. In spring the surface commonly warms from roughly 40–60°F (4–16°C) as air temperatures rise; in summer surface waters typically reach about 60–75°F (16–24°C) on warm, sunny days, though deeper layers often remain much colder (often 40–50°F / 4–10°C) because the reservoir stratifies. By fall the surface cools back toward roughly 40–60°F (4–16°C) and in winter the reservoir approaches freezing at the surface, often near 32–36°F (0–2°C) with ice forming in colder periods. Local weather, inflows, and depth make exact temperatures variable, and hypothermia remains a risk even in summer if swimmers descend into cold layers.
Swimming in Cannonsville Reservoir is not allowed. As a source of municipal drinking water managed by the New York City Department of Environmental Protection, direct-contact recreational activities such as bathing and swimming are prohibited to protect water quality and public safety. There are no public beaches for open swimming around the reservoir; access is regulated, and visitors are expected to observe posted rules. For safe summer lake swimming, nearby public lakes and designated beaches outside the watershed are recommended instead.