Ashokan Reservoir East Basin — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Ashokan Reservoir East Basin, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Ashokan Reservoir East Basin today is 18.6°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 |
|---|---|---|---|
| JUN 2 | 15.1°C | 18.0°C | |
| JUN 3 | 15.2°C | 18.0°C | |
| JUN 4 | 15.5°C | 18.0°C | |
| JUN 5 | 16.4°C | 18.0°C | |
| JUN 6 | 17.0°C | 18.0°C | |
| JUN 7 | 18.1°C | 18.0°C | |
| JUN 8 | 18.3°C | 18.0°C | |
| JUN 10 | 18.0°C | 18.6°C | |
| JUN 11 | 18.0°C | 18.5°C | |
| JUN 12 | 18.0°C | 18.5°C | |
| JUN 13 | 18.0°C | 18.5°C | |
| JUN 14 | 18.0°C | 18.5°C | |
| JUN 15 | 18.0°C | 18.4°C | |
| JUN 16 | 18.0°C | 18.4°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 | 1°C | 4°C |
| March | 0°C | 4°C | 8°C |
| April | 4°C | 8°C | 13°C |
| May | 10°C | 14°C | 18°C |
| June | 14°C | 18°C | 22°C |
| July | 16°C | 23°C | 30°C |
| August | 19°C | 24°C | 29°C |
| September | 17°C | 22°C | 27°C |
| October | 10°C | 14°C | 17°C |
| November | 5°C | 9°C | 12°C |
| December | 1°C | 4°C | 6°C |
Ashokan Reservoir East Basin: Water Temperature by Location
Ashokan Reservoir East Basin: Weather Forecast
June 9
June 10
June 11
June 12
Location & Local Information
The Ashokan Reservoir experiences typical northeasterly reservoir temperatures that vary noticeably by season. In winter the surface can be at or very near freezing, around 32°F (0°C), with deeper water remaining close to 39°F (4°C). During spring surface temperatures commonly climb from roughly 34–55°F (1–13°C) as snowmelt and cool air moderate, while summer brings the warmest conditions with surface readings often in the 60–75°F (16–24°C) range and occasionally reaching the upper 70s to about 80°F (25–27°C) on particularly hot, shallow bays. In autumn the surface cools back toward 50–60°F (10–16°C) and the reservoir typically re-stratifies as air temperatures drop.
Swimming in the East Basin is not permitted because the Ashokan Reservoir is part of New York City’s protected watershed and sources of municipal drinking water are subject to strict access and contamination controls. Restrictions are enforced to safeguard water quality and reservoir infrastructure, and there are limited shoreline facilities and no lifeguards, which would increase risk. In addition to regulatory prohibitions, cold deep water, submerged structures, and strong undercurrents make unsupervised immersion hazardous even in warmer months, so recreational bathing is discouraged and subject to enforcement.