Manasquan Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Manasquan Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Manasquan Reservoir today is 21.4°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 | 18.3°C | 24.2°C | |
| JUN 4 | 20.1°C | 24.2°C | |
| JUN 5 | 20.5°C | 24.2°C | |
| JUN 6 | 20.7°C | 24.2°C | |
| JUN 7 | 21.0°C | 24.2°C | |
| JUN 8 | 21.1°C | 24.2°C | |
| JUN 10 | 21.4°C | 24.2°C | |
| JUN 11 | 24.2°C | 21.5°C | |
| JUN 12 | 24.2°C | 21.7°C | |
| JUN 13 | 24.2°C | 21.8°C | |
| JUN 14 | 24.2°C | 22.0°C | |
| JUN 15 | 24.2°C | 22.1°C | |
| JUN 16 | 24.2°C | 22.2°C | |
| JUN 17 | 24.2°C | 22.4°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 | 4°C | 7°C |
| February | 0°C | 4°C | 7°C |
| March | 1°C | 6°C | 11°C |
| April | 8°C | 14°C | 20°C |
| May | 15°C | 19°C | 23°C |
| June | 18°C | 24°C | 30°C |
| July | 23°C | 28°C | 33°C |
| August | 23°C | 27°C | 31°C |
| September | 19°C | 22°C | 25°C |
| October | 12°C | 16°C | 19°C |
| November | 5°C | 9°C | 13°C |
| December | 1°C | 5°C | 7°C |
Manasquan Reservoir: Water Temperature by Location
Manasquan Reservoir: Weather Forecast
June 9
June 10
June 11
June 12
Location & Local Information
The Manasquan Reservoir in Howell, New Jersey, typically shows pronounced seasonal changes in water temperature. Surface readings in winter commonly hover near freezing up to about 32–45°F (0–7°C), while spring warming moves temperatures into roughly 45–60°F (7–16°C). In summer the surface can warm to roughly 68–82°F (20–28°C) on sunny days, though deeper layers remain much cooler because the reservoir stratifies. By fall temperatures usually fall back into the 50–65°F (10–18°C) range as cooling and turnover begin. These figures are approximate and vary with weather, air temperature, wind, and the time of day; deeper water remains several degrees colder than surface values throughout most of the year.
Swimming in the Manasquan Reservoir is not permitted. The restriction exists both to protect public safety—there are no lifeguards and the reservoir has steep banks, varying depths, and boat traffic—and to safeguard the water supply and ecology managed by local park authorities. Recreational use is focused on permitted boating, fishing, and trail activities rather than open-water swimming, so visitors seeking a swim should look for designated beaches or municipal pools that provide lifeguards and water-quality monitoring.