Harriman Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Harriman Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Harriman Reservoir today is 14°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 6 | 15.7°C | 14.5°C | |
| OCT 7 | 15.3°C | 14.5°C | |
| OCT 8 | 15.3°C | 14.5°C | |
| OCT 9 | 14.4°C | 14.5°C | |
| OCT 10 | 14.7°C | 14.5°C | |
| OCT 11 | 14.4°C | 14.5°C | |
| OCT 12 | 14.1°C | 14.5°C | |
| OCT 13 | 13.7°C | 14.5°C | |
| OCT 14 | 14.5°C | 14.0°C | |
| OCT 15 | 14.5°C | 14.1°C | |
| OCT 16 | 14.5°C | 14.1°C | |
| OCT 17 | 14.5°C | 14.1°C | |
| OCT 18 | 14.5°C | 14.1°C | |
| OCT 19 | 14.5°C | 14.2°C | |
| OCT 20 | 14.5°C | 14.2°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 | 2°C | 5°C |
| February | 0°C | 3°C | 6°C |
| March | 0°C | 4°C | 8°C |
| April | 2°C | 5°C | 9°C |
| May | 7°C | 10°C | 14°C |
| June | 10°C | 15°C | 19°C |
| July | 17°C | 22°C | 26°C |
| August | 20°C | 22°C | 25°C |
| September | 17°C | 21°C | 24°C |
| October | 10°C | 15°C | 19°C |
| November | 3°C | 7°C | 11°C |
| December | 1°C | 4°C | 6°C |
Harriman Reservoir: Water Temperature by Location
Harriman Reservoir: Weather Forecast
October 14
October 15
October 16
October 17
October 18
Location & Local Information
Harriman Reservoir in Vermont typically follows the seasonal temperature patterns of small New England impoundments. In spring (April–May) surface temperatures often range from about 40–55°F (4–13°C) as runoff and cooler air keep the water brisk. During summer (June–August) the surface commonly warms to roughly 65–75°F (18–24°C), and on hot, shallow flats it can briefly reach the high 70s°F (~25–26°C). In early fall (September–November) temperatures decline again to roughly 45–60°F (7–16°C). Through winter the reservoir’s surface usually drops to near freezing, about 32–39°F (0–4°C), and portions can ice over for extended periods.
Swimming opportunities at Harriman Reservoir depend on local management and conditions. Many Vermont reservoirs are managed for recreation and allow swimming in designated or informal spots, so people do swim there in summer when surface temperatures are most comfortable; however access can be restricted in specific areas for water-quality protection, safety, or wildlife management. Because spring and fall waters are cold and winter ice creates obvious hazards, swimmers should heed signage, check for posted rules, be aware of cold-water shock risk, and follow basic safety measures such as not swimming alone and using life jackets when appropriate.