Stillwater Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Stillwater Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Stillwater Reservoir today is 18.1°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 |
|---|---|---|---|
| SEP 14 | 18.4°C | 19.5°C | |
| SEP 15 | 19.1°C | 19.5°C | |
| SEP 16 | 18.8°C | 19.5°C | |
| SEP 17 | 18.2°C | 19.5°C | |
| SEP 18 | 17.7°C | 19.5°C | |
| SEP 19 | 18.2°C | 19.5°C | |
| SEP 20 | 18.7°C | 19.5°C | |
| SEP 22 | 19.5°C | 18.2°C | |
| SEP 23 | 19.5°C | 18.2°C | |
| SEP 24 | 19.5°C | 18.3°C | |
| SEP 25 | 19.5°C | 18.4°C | |
| SEP 26 | 19.5°C | 18.5°C | |
| SEP 27 | 19.5°C | 18.5°C | |
| SEP 28 | 19.5°C | 18.6°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 | 4°C |
| February | 0°C | 2°C | 5°C |
| March | 0°C | 3°C | 6°C |
| April | 1°C | 7°C | 12°C |
| May | 7°C | 12°C | 16°C |
| June | 12°C | 17°C | 21°C |
| July | 17°C | 23°C | 29°C |
| August | 19°C | 22°C | 25°C |
| September | 16°C | 20°C | 23°C |
| October | 11°C | 14°C | 17°C |
| November | 4°C | 9°C | 13°C |
| December | 0°C | 4°C | 7°C |
Stillwater Reservoir: Water Temperature by Location
Stillwater Reservoir: Weather Forecast
September 21
September 22
September 23
September 24
September 25
Location & Local Information
Stillwater Reservoir, located in the Adirondacks of northern New York, stays noticeably cooler than many lowland lakes because it is relatively deep, fed by cold streams, and surrounded by forested shorelines. Surface temperatures typically run from near freezing in winter when ice often forms (around 32°F / 0°C) to spring readings in the 34–55°F range (1–13°C) as snowmelt and weather moderate. In midsummer the warmest surface temperatures commonly reach roughly 60–75°F (15–24°C) on sunny, calm days, while autumn sees a steady decline back into the 45–60°F band (7–15°C) as air temperatures fall and turnover begins.
Swimming is commonly practiced at campsites and along accessible shorelines, so in that sense it is allowed, but there are few formal sandy beaches or lifeguarded areas. Because the reservoir is managed for multiple uses (boating, fishing, camping) and because cold, deep water, sudden drop-offs, submerged structure, and boat traffic can create hazards, swimmers should exercise caution, wear a life jacket if appropriate, and heed any posted rules or advisories. In winter the ice makes swimming unsafe except for controlled, well-prepared activities; during summer, short swims are popular but the water remains cooler than many inland recreational lakes.