Wanaque Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Wanaque Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Wanaque Reservoir today is 23.7°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 |
|---|---|---|---|
| JUN 23 | 24.3°C | 20.7°C | |
| JUN 24 | 24.4°C | 20.7°C | |
| JUN 25 | 24.4°C | 20.7°C | |
| JUN 26 | 24.4°C | 20.7°C | |
| JUN 27 | 24.3°C | 20.7°C | |
| JUN 28 | 22.5°C | 20.7°C | |
| JUN 29 | 23.0°C | 20.7°C | |
| JUN 30 | 23.0°C | 20.7°C | |
| JUL 1 | 26.5°C | 23.8°C | |
| JUL 2 | 26.5°C | 24.0°C | |
| JUL 3 | 26.5°C | 24.1°C | |
| JUL 4 | 26.5°C | 24.3°C | |
| JUL 5 | 26.5°C | 24.4°C | |
| JUL 6 | 26.5°C | 24.5°C | |
| JUL 7 | 26.5°C | 24.7°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 | 9°C |
| April | 4°C | 10°C | 16°C |
| May | 11°C | 15°C | 20°C |
| June | 17°C | 21°C | 25°C |
| July | 23°C | 27°C | 30°C |
| August | 23°C | 26°C | 29°C |
| September | 18°C | 23°C | 27°C |
| October | 12°C | 16°C | 20°C |
| November | 6°C | 9°C | 12°C |
| December | 1°C | 4°C | 7°C |
Wanaque Reservoir: Water Temperature by Location
Wanaque Reservoir: Weather Forecast
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Location & Local Information
Wanaque Reservoir, a man-made impoundment in northern New Jersey that supplies drinking water to the region, typically shows seasonal surface temperatures that reflect local weather and depth. In spring, surface water commonly ranges from about 45–65°F (7–18°C) as the lake warms; summer surface temperatures most often sit between roughly 70–80°F (21–27°C), with occasional pockets reaching the low 80s°F (around 28°C) on hot, calm afternoons. By autumn the surface cools into the 50–65°F (10–18°C) band before dropping further in winter when surface readings often fall to near freezing, roughly 32–40°F (0–4°C), and portions of the reservoir can ice over. Deeper water remains noticeably colder year-round because of stratification, sometimes 10–15°F (6–8°C) below surface values, and exact temperatures vary with inflow, weather and time of day.
Swimming in Wanaque Reservoir is generally not permitted because the impoundment functions as a public drinking-water supply and is subject to restrictions for public health, safety and legal reasons. There are no formal swim beaches or lifeguarded areas, and managers cite contamination risk, cold-water and underwater hazards, and liability concerns as reasons for prohibitions and enforcement. Even in summer, sudden cold depths and boat traffic can present hazards, so recreational activities are limited or regulated rather than allowing open swimming.