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 14.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 |
|---|---|---|---|
| OCT 22 | 15.3°C | 15.0°C | |
| OCT 23 | 15.0°C | 15.0°C | |
| OCT 24 | 14.0°C | 15.0°C | |
| OCT 25 | 13.8°C | 15.0°C | |
| OCT 26 | 14.0°C | 15.0°C | |
| OCT 27 | 13.3°C | 15.0°C | |
| OCT 28 | 14.3°C | 15.0°C | |
| OCT 29 | 14.3°C | 15.0°C | |
| OCT 30 | 15.0°C | 14.1°C | |
| OCT 31 | 15.0°C | 13.8°C | |
| NOV 1 | 9.3°C | 13.6°C | |
| NOV 2 | 9.3°C | 13.3°C | |
| NOV 3 | 9.3°C | 13.1°C | |
| NOV 4 | 9.3°C | 12.8°C | |
| NOV 5 | 9.3°C | 12.6°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 | 21°C | 25°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
October 30
October 31
November 1
November 2
November 3
November 4
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.