Piney Run Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Piney Run Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Piney Run Reservoir today is 18.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 |
|---|---|---|---|
| OCT 5 | 21.3°C | 20.5°C | |
| OCT 6 | 20.6°C | 20.5°C | |
| OCT 7 | 20.2°C | 20.5°C | |
| OCT 8 | 20.0°C | 20.5°C | |
| OCT 9 | 19.4°C | 20.5°C | |
| OCT 10 | 19.2°C | 20.5°C | |
| OCT 11 | 19.2°C | 20.5°C | |
| OCT 12 | 19.1°C | 20.5°C | |
| OCT 13 | 20.5°C | 18.6°C | |
| OCT 14 | 20.5°C | 18.7°C | |
| OCT 15 | 20.5°C | 18.8°C | |
| OCT 16 | 20.5°C | 18.9°C | |
| OCT 17 | 20.5°C | 19.0°C | |
| OCT 18 | 20.5°C | 19.1°C | |
| OCT 19 | 20.5°C | 19.2°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 | 2°C | 5°C | 9°C |
| February | 1°C | 4°C | 7°C |
| March | 1°C | 6°C | 12°C |
| April | 9°C | 13°C | 18°C |
| May | 13°C | 19°C | 25°C |
| June | 18°C | 21°C | 25°C |
| July | 24°C | 27°C | 30°C |
| August | 22°C | 25°C | 27°C |
| September | 21°C | 24°C | 26°C |
| October | 17°C | 21°C | 24°C |
| November | 8°C | 13°C | 17°C |
| December | 4°C | 6°C | 9°C |
Piney Run Reservoir: Water Temperature by Location
Piney Run Reservoir: Weather Forecast
October 13
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Piney Run Reservoir in Maryland experiences typical mid‑Atlantic seasonal water temperatures that vary by depth and weather. In winter the surface commonly ranges from about 33–45°F (1–7°C), with near‑freezing temperatures possible during cold spells. Spring brings a warming trend, roughly 45–65°F (7–18°C) as sunlight and runoff raise the surface. In summer the reservoir can reach its warmest values, often about 70–85°F (21–29°C) on hot afternoons, although deeper water remains cooler. Autumn sees a steady decline, with surface temperatures generally falling back into the 50–70°F (10–21°C) range. Because reservoirs stratify, water below the surface can be much colder year‑round, so surface readings don’t reflect subsurface conditions.
Swimming in the reservoir is generally not permitted and is discouraged for several reasons. Piney Run is managed as a waterbody where water quality and public safety are priorities; prohibitions help protect drinking‑water sources, reduce contamination risks, and avoid legal and rescue liabilities. In addition, there are no lifeguarded beaches at the reservoir and underwater hazards, sudden depth changes and cold layers increase the risk of hypothermia and drowning. Visitors often use shore trails, boating (where allowed) and nearby supervised pools for recreational water contact instead.