Marsh Creek Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Marsh Creek Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Marsh Creek Reservoir today is 21.5°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 | 18.3°C | 23.0°C | |
| JUN 4 | 19.2°C | 23.0°C | |
| JUN 5 | 19.7°C | 23.0°C | |
| JUN 6 | 20.0°C | 23.0°C | |
| JUN 7 | 21.1°C | 23.0°C | |
| JUN 8 | 21.1°C | 23.0°C | |
| JUN 10 | 21.5°C | 23.0°C | |
| JUN 11 | 23.0°C | 21.6°C | |
| JUN 12 | 23.0°C | 21.7°C | |
| JUN 13 | 23.0°C | 21.7°C | |
| JUN 14 | 23.0°C | 21.8°C | |
| JUN 15 | 23.0°C | 21.9°C | |
| JUN 16 | 23.0°C | 22.0°C | |
| JUN 17 | 23.0°C | 22.0°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 | 6°C | 10°C |
| April | 8°C | 14°C | 20°C |
| May | 13°C | 18°C | 22°C |
| June | 16°C | 23°C | 30°C |
| July | 20°C | 27°C | 33°C |
| August | 21°C | 26°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 | 2°C | 5°C | 7°C |
Marsh Creek Reservoir: Water Temperature by Location
Marsh Creek Reservoir: Weather Forecast
June 9
June 10
June 11
June 12
Location & Local Information
Marsh Creek Reservoir in southeastern Pennsylvania experiences typical temperate-latitude lake temperatures that vary with the seasons. In winter the surface often hovers near freezing, roughly 33–40°F (1–4°C), and ice can form in sustained cold spells. Spring warms from about 40–60°F (4–16°C) as runoff and air temperatures rise. Peak summer surface temperatures commonly reach 70–78°F (21–26°C) on warm afternoons, though deeper water can remain much cooler, often in the 40s–50s°F (4–12°C) because the reservoir thermally stratifies. In autumn the surface cools back to roughly 50–65°F (10–18°C) as air temperatures fall and mixing increases.
Swimming in Marsh Creek Reservoir itself is not permitted as part of park management and public-safety practice. Restrictions are based on concerns about water quality, sudden depth changes and submerged hazards, boat traffic and wakes, and the absence of supervised lifeguarded areas on the open reservoir. These factors raise drowning and pollution risks, so recreational use is generally directed toward boating and fishing in designated areas rather than unsupervised swimming. Visitors seeking swimming opportunities are advised to use staffed swimming facilities or designated beaches where lifeguards, water-quality monitoring, and appropriate safety infrastructure are provided.