Prettyboy Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Prettyboy Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Prettyboy Reservoir today is 22.2°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 | 19.5°C | 19.7°C | |
| JUN 4 | 19.7°C | 19.7°C | |
| JUN 5 | 20.0°C | 19.7°C | |
| JUN 6 | 20.7°C | 19.7°C | |
| JUN 7 | 21.8°C | 19.7°C | |
| JUN 8 | 21.9°C | 19.7°C | |
| JUN 11 | 19.7°C | 22.1°C | |
| JUN 12 | 19.7°C | 22.0°C | |
| JUN 13 | 19.7°C | 21.8°C | |
| JUN 14 | 19.7°C | 21.7°C | |
| JUN 15 | 19.7°C | 21.6°C | |
| JUN 16 | 19.7°C | 21.5°C | |
| JUN 17 | 19.7°C | 21.3°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 | 1°C | 4°C | 7°C |
| February | 1°C | 4°C | 7°C |
| March | 1°C | 5°C | 10°C |
| April | 7°C | 12°C | 17°C |
| May | 13°C | 18°C | 24°C |
| June | 17°C | 20°C | 23°C |
| July | 19°C | 24°C | 29°C |
| August | 21°C | 23°C | 26°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 | 7°C | 10°C |
Prettyboy Reservoir: Water Temperature by Location
Prettyboy Reservoir: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Prettyboy Reservoir, a drinking-water impoundment in Maryland, tends to run cooler than many shallow recreational lakes. Seasonal surface temperatures typically range from roughly 34–40°F (1–4°C) in winter, rise to about 45–65°F (7–18°C) through spring, peak in midsummer near 70–82°F (21–28°C) depending on air temperatures and depth, and then cool back to roughly 50–70°F (10–21°C) in autumn. Local conditions, recent weather, and depth can change these numbers day to day; deeper, shaded areas will remain colder than shallow, sunlit spots. Even in summer months the reservoir can have sudden cold layers or thermoclines that affect how warm the surface feels.
Public swimming is not permitted at Prettyboy Reservoir. The prohibition reflects its role as a municipal water supply and the need to protect source-water quality, as well as safety concerns—cold water, steep banks, submerged hazards, and limited shoreline access increase drowning risk. Recreation is generally limited to authorized boating or fishing under the management rules for the watershed, but entering the water for swimming is restricted to prevent contamination and to comply with reservoir regulations designed to keep the supply safe for downstream users.