Swartswood Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Swartswood Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Swartswood Lake today is 21.2°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 | 18.5°C | 19.4°C | |
| JUN 4 | 19.0°C | 19.4°C | |
| JUN 5 | 19.5°C | 19.4°C | |
| JUN 6 | 19.7°C | 19.4°C | |
| JUN 7 | 20.4°C | 19.4°C | |
| JUN 8 | 20.8°C | 19.4°C | |
| JUN 10 | 21.2°C | 19.4°C | |
| JUN 11 | 19.4°C | 21.1°C | |
| JUN 12 | 19.4°C | 21.0°C | |
| JUN 13 | 19.4°C | 20.9°C | |
| JUN 14 | 19.4°C | 20.8°C | |
| JUN 15 | 19.4°C | 20.8°C | |
| JUN 16 | 19.4°C | 20.7°C | |
| JUN 17 | 19.4°C | 20.6°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 | 3°C | 7°C |
| April | 4°C | 11°C | 18°C |
| May | 10°C | 15°C | 21°C |
| June | 17°C | 19°C | 22°C |
| July | 21°C | 26°C | 30°C |
| August | 22°C | 26°C | 29°C |
| September | 20°C | 24°C | 27°C |
| October | 12°C | 16°C | 20°C |
| November | 6°C | 10°C | 12°C |
| December | 0°C | 4°C | 6°C |
Swartswood Lake: Water Temperature by Location
Swartswood Lake: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Swartswood Lake, within Swartswood State Park in northern New Jersey, experiences typical northeastern seasonal water temperatures. In summer the surface often warms to roughly 68–80°F (20–27°C) on sunny days, though cooler pockets can persist from springs and deeper water. During spring and fall the lake commonly measures about 45–68°F (7–20°C), and in winter temperatures approach freezing, generally around 32–40°F (0–4°C) with ice formation likely during prolonged cold spells. Local conditions such as recent weather, wind, and water depth can shift these numbers noticeably from week to week.
Swimming is permitted at the park’s designated beach area during the warmer months because the state park manages that zone for public bathing and recreation and enforces safety rules. Seasonal supervision or posted regulations may apply, and swimming outside marked areas is discouraged because of boat traffic, variable depths, and the absence of lifeguards. Even in summer, swimmers should be aware of cooler water pockets and the risk of cold shock; in winter, open-water swimming is unsafe due to low temperatures and ice hazards. Visitors should follow park guidance, check current conditions, and use caution when entering the water.