Prompton Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Prompton Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Prompton 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 |
|---|---|---|---|
| JUN 23 | 23.2°C | 19.7°C | |
| JUN 24 | 23.0°C | 19.7°C | |
| JUN 25 | 22.9°C | 19.7°C | |
| JUN 26 | 22.9°C | 19.7°C | |
| JUN 27 | 22.5°C | 19.7°C | |
| JUN 28 | 20.8°C | 19.7°C | |
| JUN 29 | 21.0°C | 19.7°C | |
| JUN 30 | 21.0°C | 19.7°C | |
| JUL 1 | 25.5°C | 21.6°C | |
| JUL 2 | 25.5°C | 21.8°C | |
| JUL 3 | 25.5°C | 22.0°C | |
| JUL 4 | 25.5°C | 22.2°C | |
| JUL 5 | 25.5°C | 22.4°C | |
| JUL 6 | 25.5°C | 22.6°C | |
| JUL 7 | 25.5°C | 22.8°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 | 2°C | 5°C |
| February | 0°C | 1°C | 4°C |
| March | 0°C | 3°C | 7°C |
| April | 4°C | 10°C | 15°C |
| May | 11°C | 15°C | 19°C |
| June | 16°C | 20°C | 24°C |
| July | 21°C | 26°C | 30°C |
| August | 22°C | 26°C | 29°C |
| September | 18°C | 23°C | 27°C |
| October | 10°C | 14°C | 18°C |
| November | 4°C | 8°C | 12°C |
| December | 0°C | 4°C | 6°C |
Prompton Lake: Water Temperature by Location
Prompton Lake: Weather Forecast
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Location & Local Information
Prompton Lake is a relatively small reservoir in northeastern Pennsylvania whose water temperatures vary strongly with the seasons. In winter the surface is typically at or just above freezing, around 32–39°F (0–4°C) beneath ice cover. Spring brings a steady rise, with surface temperatures commonly in the 40–60°F range (4–16°C) as snowmelt and cool runoff dominate. By summer the lake often warms to roughly 70–80°F (21–27°C) at the surface on warm, sunny days, though cooler thermoclines can persist below a few feet. During autumn the water cools again to roughly 50–65°F (10–18°C) as air temperatures fall and turnover begins.
Swimming at Prompton Lake is not provided as a managed recreational activity; the state park does not maintain an official swimming beach, and swimming is generally discouraged or not permitted under park rules and reservoir management practices. The restrictions are for safety and resource reasons: the reservoir has variable depths, hidden drop-offs, boat traffic, cold-water hazards, and limited lifeguard or emergency coverage. Visitors may find permitted alternatives such as shoreline picnicking, boating and fishing, but anyone considering entering the water should check current park regulations and exercise caution because of temperature-related risks like cold-water shock.