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 19.5°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 |
|---|---|---|---|
| JUN 3 | 16.3°C | 19.0°C | |
| JUN 4 | 16.4°C | 19.0°C | |
| JUN 5 | 17.3°C | 19.0°C | |
| JUN 6 | 17.9°C | 19.0°C | |
| JUN 7 | 18.2°C | 19.0°C | |
| JUN 8 | 18.9°C | 19.0°C | |
| JUN 10 | 19.5°C | 19.0°C | |
| JUN 11 | 19.0°C | 19.5°C | |
| JUN 12 | 19.0°C | 19.5°C | |
| JUN 13 | 19.0°C | 19.4°C | |
| JUN 14 | 19.0°C | 19.4°C | |
| JUN 15 | 19.0°C | 19.4°C | |
| JUN 16 | 19.0°C | 19.4°C | |
| JUN 17 | 19.0°C | 19.3°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 | 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 | 19°C | 22°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
June 9
June 10
June 11
June 12
June 13
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.