Monksville Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Monksville Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Monksville Reservoir today is 20.4°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 | 18.7°C | 20.0°C | |
| JUN 4 | 18.8°C | 20.0°C | |
| JUN 5 | 19.2°C | 20.0°C | |
| JUN 6 | 19.4°C | 20.0°C | |
| JUN 7 | 20.0°C | 20.0°C | |
| JUN 8 | 20.1°C | 20.0°C | |
| JUN 10 | 20.4°C | 20.0°C | |
| JUN 11 | 20.0°C | 20.4°C | |
| JUN 12 | 20.0°C | 20.4°C | |
| JUN 13 | 20.0°C | 20.3°C | |
| JUN 14 | 20.0°C | 20.3°C | |
| JUN 15 | 20.0°C | 20.3°C | |
| JUN 16 | 20.0°C | 20.3°C | |
| JUN 17 | 20.0°C | 20.3°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 | 8°C |
| April | 4°C | 10°C | 16°C |
| May | 11°C | 16°C | 21°C |
| June | 17°C | 20°C | 23°C |
| July | 22°C | 26°C | 30°C |
| August | 22°C | 26°C | 29°C |
| September | 19°C | 23°C | 27°C |
| October | 11°C | 15°C | 19°C |
| November | 6°C | 9°C | 12°C |
| December | 1°C | 4°C | 8°C |
Monksville Reservoir: Water Temperature by Location
Monksville Reservoir: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Monksville Reservoir, a man-made drinking-water impoundment in northern New Jersey, has water temperatures that vary considerably through the year. In winter the surface often ranges from about 32–45°F (0–7°C), with colder near-surface ice possible on still, calm days. Spring brings a thaw and warming to roughly 40–65°F (4–18°C) as sun and runoff raise temperatures. In summer the surface typically warms to about 68–80°F (20–27°C), though shallow bays can heat a few degrees higher on hot days while deeper water remains noticeably cooler. Autumn cooling generally produces temperatures in the 50–65°F (10–18°C) window as air temperatures fall and stratification breaks down.
Swimming at Monksville Reservoir is not permitted because the lake serves primarily as a potable water supply and is managed to protect water quality and public safety. Restrictions on bathers help reduce contamination risks and preserve treatment processes. In addition, variable depths, cold thermoclines and limited lifeguarded areas would present safety concerns even when surface temperatures are warm. Recreational boating and fishing are allowed under specific rules, but direct-contact activities such as swimming are prohibited to maintain the reservoir’s role in regional water supply.