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 27.1°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 79°F (26°C) to 82°F (28°C). This is very warm water, allowing for extended stays without any discomfort. Swimming in these conditions will be particularly enjoyable, making it the ideal temperature range for those who want to relax in the sea. Additionally, water in this temperature range is suitable for children and elderly people, as it is comfortable for prolonged stays. 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 |
|---|---|---|---|
| AUG 4 | 27.0°C | 26.0°C | |
| AUG 5 | 27.1°C | 26.0°C | |
| AUG 6 | 26.7°C | 26.0°C | |
| AUG 7 | 26.6°C | 26.0°C | |
| AUG 8 | 26.9°C | 26.0°C | |
| AUG 9 | 26.9°C | 26.0°C | |
| AUG 10 | 27.0°C | 26.0°C | |
| AUG 11 | 27.0°C | 26.0°C | |
| AUG 12 | 26.0°C | 27.0°C | |
| AUG 13 | 26.0°C | 27.0°C | |
| AUG 14 | 26.0°C | 26.9°C | |
| AUG 15 | 26.0°C | 26.9°C | |
| AUG 16 | 26.0°C | 26.8°C | |
| AUG 17 | 26.0°C | 26.8°C | |
| AUG 18 | 26.0°C | 26.7°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
August 12
August 13
August 14
August 15
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.