Assunpink Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Assunpink Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Assunpink Lake today is 23°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 |
|---|---|---|---|
| SEP 14 | 23.5°C | 22.8°C | |
| SEP 15 | 23.6°C | 22.8°C | |
| SEP 16 | 23.6°C | 22.8°C | |
| SEP 17 | 23.5°C | 22.8°C | |
| SEP 18 | 22.1°C | 22.8°C | |
| SEP 19 | 22.9°C | 22.8°C | |
| SEP 20 | 23.8°C | 22.8°C | |
| SEP 21 | 23.0°C | 22.8°C | |
| SEP 22 | 22.8°C | 23.0°C | |
| SEP 23 | 22.8°C | 23.0°C | |
| SEP 24 | 22.8°C | 23.0°C | |
| SEP 25 | 22.8°C | 23.0°C | |
| SEP 26 | 22.8°C | 23.0°C | |
| SEP 27 | 22.8°C | 22.9°C | |
| SEP 28 | 22.8°C | 22.9°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 | 9°C | 15°C | 20°C |
| May | 14°C | 19°C | 24°C |
| June | 18°C | 24°C | 30°C |
| July | 21°C | 27°C | 33°C |
| August | 22°C | 27°C | 31°C |
| September | 20°C | 23°C | 26°C |
| October | 12°C | 16°C | 20°C |
| November | 5°C | 9°C | 13°C |
| December | 1°C | 5°C | 7°C |
Assunpink Lake: Water Temperature by Location
Assunpink Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Assunpink Lake, the reservoir in Mercer County Park formed by the Assunpink Creek, experiences the same seasonal shifts typical of small to mid-size northeastern lakes. Surface temperatures in winter commonly hover near freezing, roughly 32–40°F (0–4°C). Spring brings steady warming, with surface values often ranging from about 40–65°F (4–18°C) as air temperatures rise and ice melts. In summer the lake can reach its warmest—typical surface readings are in the 70s to low 80s°F (21–28°C) on warm, calm days—while deeper water remains cooler. Fall sees a progressive decline, with surface temperatures commonly falling into the 50–68°F (10–20°C) range. Exact temperatures vary by year, recent weather, wind, and depth; thermal stratification can produce noticeably cooler conditions below the surface even when the top layer is warm.
Swimming at Assunpink Lake is generally not permitted for reasons of public safety and resource management. Park regulations and posted signs commonly prohibit open-water swimming because there are no lifeguards, boat and angling activities create hazards, and underwater hazards and variable depths increase risk. Water quality and habitat protection are also considerations. Visitors seeking swimming opportunities are usually directed to designated beaches or managed waterfront facilities nearby where supervision, permitted water-contact activities, and regular water-quality monitoring are provided.