Spruce Run Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Spruce Run Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Spruce Run Reservoir today is 26.8°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 | 26.9°C | 25.5°C | |
| AUG 5 | 27.0°C | 25.5°C | |
| AUG 6 | 26.6°C | 25.5°C | |
| AUG 7 | 26.2°C | 25.5°C | |
| AUG 8 | 26.3°C | 25.5°C | |
| AUG 9 | 26.3°C | 25.5°C | |
| AUG 10 | 26.5°C | 25.5°C | |
| AUG 11 | 26.6°C | 25.5°C | |
| AUG 12 | 25.5°C | 26.7°C | |
| AUG 13 | 25.5°C | 26.7°C | |
| AUG 14 | 25.5°C | 26.6°C | |
| AUG 15 | 25.5°C | 26.5°C | |
| AUG 16 | 25.5°C | 26.5°C | |
| AUG 17 | 25.5°C | 26.4°C | |
| AUG 18 | 25.5°C | 26.3°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 | 4°C | 7°C |
| April | 7°C | 14°C | 20°C |
| May | 14°C | 18°C | 22°C |
| June | 15°C | 23°C | 30°C |
| July | 15°C | 24°C | 33°C |
| August | 20°C | 26°C | 31°C |
| September | 19°C | 22°C | 25°C |
| October | 11°C | 15°C | 19°C |
| November | 5°C | 8°C | 11°C |
| December | 2°C | 5°C | 7°C |
Spruce Run Reservoir: Water Temperature by Location
Spruce Run Reservoir: Weather Forecast
August 12
August 13
August 14
August 15
Location & Local Information
Spruce Run Reservoir, in Hunterdon County, experiences typical northeastern reservoir temperature patterns. Surface water in winter often hovers around freezing to roughly 32–40°F (0–4°C). In spring it warms through approximately 40–60°F (4–16°C) as runoff and air temperatures rise. By summer, surface temperatures commonly reach about 68–80°F (20–27°C) on warm days, though sheltered coves and deeper water remain cooler. In autumn the lake cools back to roughly 50–65°F (10–18°C). Because the reservoir is relatively deep in places, a thermocline can develop in summer and beneath that layer temperatures stay markedly colder, increasing the risk of cold shock if entering deeper water.
Swimming at Spruce Run is generally not permitted as a primary activity; the reservoir is managed principally for water supply and multiuse recreation such as boating and fishing, and there are no lifeguarded beaches operated by the managing agencies. Restrictions exist to protect drinking-water quality and public safety, including heavy boat traffic, changeable currents and the presence of cold, deep water that can cause hypothermia even on warm days. Visitors seeking to cool off should use approved shore areas for wading where allowed and follow posted regulations and seasonal advisories.