Hopewell Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Hopewell Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Hopewell Lake today is 17.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 |
|---|---|---|---|
| OCT 5 | 19.9°C | 16.5°C | |
| OCT 6 | 18.9°C | 16.5°C | |
| OCT 7 | 19.7°C | 16.5°C | |
| OCT 8 | 18.8°C | 16.5°C | |
| OCT 9 | 17.8°C | 16.5°C | |
| OCT 10 | 17.7°C | 16.5°C | |
| OCT 11 | 18.0°C | 16.5°C | |
| OCT 12 | 18.2°C | 16.5°C | |
| OCT 13 | 16.5°C | 17.5°C | |
| OCT 14 | 16.5°C | 17.4°C | |
| OCT 15 | 16.5°C | 17.4°C | |
| OCT 16 | 16.5°C | 17.3°C | |
| OCT 17 | 16.5°C | 17.3°C | |
| OCT 18 | 16.5°C | 17.2°C | |
| OCT 19 | 16.5°C | 17.2°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 | 4°C | 7°C |
| February | 0°C | 4°C | 7°C |
| March | 1°C | 6°C | 10°C |
| April | 9°C | 15°C | 20°C |
| May | 14°C | 18°C | 22°C |
| June | 16°C | 23°C | 30°C |
| July | 19°C | 26°C | 33°C |
| August | 23°C | 27°C | 31°C |
| September | 20°C | 23°C | 25°C |
| October | 12°C | 17°C | 21°C |
| November | 5°C | 9°C | 12°C |
| December | 1°C | 4°C | 7°C |
Hopewell Lake: Water Temperature by Location
Hopewell Lake: Weather Forecast
October 13
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Specific, long-term temperature records for Hopewell Lake are not always published, but like many small inland lakes in Pennsylvania its surface water follows a clear seasonal pattern. In winter the surface commonly approaches freezing, roughly 32–40°F (0–4°C). Spring warming lifts surface temperatures into the 40–60°F range (4–16°C) as ice melts and air temperatures rise. In summer the lake’s surface typically warms to about 68–80°F (20–27°C), with the warmest spells pushing the upper end into the mid‑70s to low‑80s °F (24–28°C). Even in summer, deeper layers can remain substantially cooler — often 40–55°F (4–13°C) below the thermocline — so water temperature can change quickly with depth or weather.
Whether swimming is allowed at Hopewell Lake depends on ownership and local management rather than temperature alone. If the lake is managed as part of a park with a designated beach, swimming is generally permitted during warm months because surface temperatures become comfortable; lifeguard presence, posted hours, and seasonal water‑quality checks often dictate when it’s safe. Conversely, lakes used for drinking water, on private property, or lacking approved access frequently prohibit swimming to protect water quality and reduce liability. Always check posted signs or contact local authorities before entering the water, and be mindful of cold, deep water and the absence of lifeguards.