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 26.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. 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 |
|---|---|---|---|
| AUG 4 | 26.2°C | 25.5°C | |
| AUG 5 | 26.4°C | 25.5°C | |
| AUG 6 | 26.0°C | 25.5°C | |
| AUG 7 | 26.3°C | 25.5°C | |
| AUG 8 | 26.2°C | 25.5°C | |
| AUG 9 | 26.2°C | 25.5°C | |
| AUG 10 | 26.4°C | 25.5°C | |
| AUG 11 | 26.4°C | 25.5°C | |
| AUG 12 | 25.5°C | 26.5°C | |
| AUG 13 | 25.5°C | 26.4°C | |
| AUG 14 | 25.5°C | 26.4°C | |
| AUG 15 | 25.5°C | 26.3°C | |
| AUG 16 | 25.5°C | 26.3°C | |
| AUG 17 | 25.5°C | 26.2°C | |
| AUG 18 | 25.5°C | 26.2°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 | 21°C | 26°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
August 12
August 13
August 14
August 15
August 16
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.