Beltzville Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Beltzville Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Beltzville Lake today is 21.4°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 | 21.9°C | 22.0°C | |
| SEP 15 | 22.0°C | 22.0°C | |
| SEP 16 | 21.6°C | 22.0°C | |
| SEP 17 | 21.5°C | 22.0°C | |
| SEP 18 | 20.3°C | 22.0°C | |
| SEP 19 | 21.1°C | 22.0°C | |
| SEP 20 | 21.8°C | 22.0°C | |
| SEP 21 | 21.4°C | 22.0°C | |
| SEP 22 | 22.0°C | 21.4°C | |
| SEP 23 | 22.0°C | 21.5°C | |
| SEP 24 | 22.0°C | 21.5°C | |
| SEP 25 | 22.0°C | 21.5°C | |
| SEP 26 | 22.0°C | 21.6°C | |
| SEP 27 | 22.0°C | 21.6°C | |
| SEP 28 | 22.0°C | 21.6°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 | 8°C |
| April | 6°C | 13°C | 20°C |
| May | 13°C | 18°C | 22°C |
| June | 16°C | 23°C | 30°C |
| July | 22°C | 28°C | 33°C |
| August | 22°C | 27°C | 31°C |
| September | 19°C | 22°C | 25°C |
| October | 12°C | 16°C | 20°C |
| November | 5°C | 9°C | 12°C |
| December | 1°C | 4°C | 7°C |
Beltzville Lake: Water Temperature by Location
Beltzville Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Beltzville Lake in eastern Pennsylvania experiences a wide seasonal swing in surface water temperatures. In winter the surface typically approaches near-freezing conditions, roughly 33–40°F (1–4°C). Spring sees a steady rise, often ranging from about 40–60°F (4–16°C) as the upper layers warm. During summer, surface temperatures are most comfortable for recreation, frequently between about 68–82°F (20–28°C) on warm afternoons, with shallow bays occasionally reaching the mid-80s°F (around 29°C). In fall the lake cools again to roughly 50–65°F (10–18°C). Deeper waters remain substantially cooler year-round; during summer the hypolimnion can stay in the 50s°F (10–15°C), so temperature varies with depth and location.
Swimming is allowed at Beltzville Lake in designated recreational areas because the reservoir is managed for multiple uses, including boating, fishing and beach swimming. Authorities limit swimming to marked zones to reduce conflicts with boat traffic, protect water quality and provide a safer environment for bathers. Open-water swimming outside those areas can be colder and riskier because of boat wakes, sudden depth changes, and colder deep water, so following posted rules and seasonal advisories improves safety.