Lake Arthur — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Arthur, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Arthur today is 21.1°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 6 | 19.5°C | 21.5°C | |
| JUN 7 | 20.3°C | 21.5°C | |
| JUN 8 | 20.1°C | 21.5°C | |
| JUN 10 | 20.8°C | 21.5°C | |
| JUN 11 | 21.1°C | 21.5°C | |
| JUN 12 | 21.1°C | 21.5°C | |
| JUN 13 | 21.1°C | 21.5°C | |
| JUN 14 | 21.5°C | 21.1°C | |
| JUN 15 | 21.5°C | 21.1°C | |
| JUN 16 | 21.5°C | 21.2°C | |
| JUN 17 | 21.5°C | 21.2°C | |
| JUN 18 | 21.5°C | 21.2°C | |
| JUN 19 | 21.5°C | 21.2°C | |
| JUN 20 | 21.5°C | 21.2°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 | 0°C | 3°C | 6°C |
| February | 0°C | 4°C | 7°C |
| March | 1°C | 5°C | 9°C |
| April | 7°C | 12°C | 17°C |
| May | 12°C | 17°C | 22°C |
| June | 17°C | 22°C | 26°C |
| July | 23°C | 25°C | 27°C |
| August | 22°C | 26°C | 29°C |
| September | 20°C | 23°C | 25°C |
| October | 13°C | 17°C | 21°C |
| November | 4°C | 10°C | 16°C |
| December | 0°C | 5°C | 8°C |
Lake Arthur: Water Temperature by Location
Lake Arthur: Weather Forecast
June 14
June 15
June 16
June 17
Location & Local Information
Lake Arthur, the reservoir at Moraine State Park in western Pennsylvania, experiences a strong seasonal cycle in water temperature. In winter the surface commonly hovers near freezing, roughly 33–40°F (0.5–4°C). Spring sees a steady rise as inflows and sun warm the shallows to about 40–60°F (4–16°C). Peak summer surface temperatures typically reach the upper 60s to upper 70s Fahrenheit, about 20–26°C, with occasional spots approaching 80°F (27°C) on warm, calm afternoons; deeper water remains noticeably cooler because of stratification. By autumn the surface cools back into the mid-40s to low-60s °F (7–16°C) as the lake mixes.
Swimming is permitted in and around Lake Arthur in many areas, but there are practical and safety considerations that shape where and when people choose to get in. Boat traffic, variable water clarity, sudden drop-offs and the absence of lifeguards in most spots mean that swimmers are often advised to use marked or managed beach areas and to heed any posted advisories for algae blooms or bacterial contamination. The warmest and most comfortable swimming conditions are generally in July and August, while spring and late-season water remain chilly enough to increase the risk of cold-shock and hypothermia.