Speedwell Forge Dam — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Speedwell Forge Dam, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Speedwell Forge Dam today is 21.8°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 | 21.6°C | 19.6°C | |
| JUN 24 | 21.8°C | 19.6°C | |
| JUN 25 | 21.5°C | 19.6°C | |
| JUN 26 | 21.5°C | 19.6°C | |
| JUN 27 | 20.9°C | 19.6°C | |
| JUN 28 | 21.0°C | 19.6°C | |
| JUN 29 | 21.5°C | 19.6°C | |
| JUN 30 | 21.8°C | 19.6°C | |
| JUL 1 | 25.0°C | 22.0°C | |
| JUL 2 | 25.0°C | 22.1°C | |
| JUL 3 | 25.0°C | 22.3°C | |
| JUL 4 | 25.0°C | 22.4°C | |
| JUL 5 | 25.0°C | 22.6°C | |
| JUL 6 | 25.0°C | 22.8°C | |
| JUL 7 | 25.0°C | 22.9°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 | 2°C | 7°C | 12°C |
| April | 9°C | 13°C | 17°C |
| May | 12°C | 17°C | 23°C |
| June | 16°C | 20°C | 24°C |
| July | 21°C | 25°C | 29°C |
| August | 20°C | 23°C | 26°C |
| September | 19°C | 23°C | 26°C |
| October | 10°C | 17°C | 24°C |
| November | 6°C | 11°C | 16°C |
| December | 2°C | 7°C | 10°C |
Speedwell Forge Dam: Water Temperature by Location
Speedwell Forge Dam: Weather Forecast
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Location & Local Information
Speedwell Forge Lake is a small impoundment whose surface temperatures follow the typical seasonal pattern of inland Pennsylvania waters. In winter the lake can hover around freezing, often ranging roughly 32–40°F (0–4°C) and occasionally developing partial ice cover. Spring temperatures climb from the 40s into the 60s°F (about 4–18°C) as air warms and runoff mixes through the basin. Peak summer surface waters commonly sit in the mid-60s to upper-70s°F, roughly 18–26°C, with the warmest pockets on calm, sunny days. By autumn the surface usually cools back toward the 40s–60s°F range (approximately 5–16°C) as nights lengthen and stratification breaks down. Deeper water remains noticeably colder year-round, so overall thermal profiles can change quickly with weather and depth.
Swimming in Speedwell Forge Lake is not generally permitted under park regulations, primarily for safety and water-quality reasons. There are no lifeguards or supervised swim areas, and the presence of submerged structures, steep drop-offs around the dam, fluctuating currents near the spillway, and the potential for sudden cold-water layers raise drowning and cold-shock risks. In addition, routine monitoring and treatment for recreational bathing are typically not provided in such reservoir settings, so authorities restrict swimming to minimize hazards. Visitors are instead encouraged to enjoy the shoreline, fishing, and sanctioned boating opportunities while observing posted rules.