Rio Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Rio Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Rio Reservoir today is 20.8°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 | 21.7°C | 18.9°C | |
| JUN 24 | 21.6°C | 18.9°C | |
| JUN 25 | 21.5°C | 18.9°C | |
| JUN 26 | 21.6°C | 18.9°C | |
| JUN 27 | 21.3°C | 18.9°C | |
| JUN 28 | 20.3°C | 18.9°C | |
| JUN 29 | 20.3°C | 18.9°C | |
| JUN 30 | 20.4°C | 18.9°C | |
| JUL 1 | 24.0°C | 21.0°C | |
| JUL 2 | 24.0°C | 21.1°C | |
| JUL 3 | 24.0°C | 21.3°C | |
| JUL 4 | 24.0°C | 21.4°C | |
| JUL 5 | 24.0°C | 21.6°C | |
| JUL 6 | 24.0°C | 21.8°C | |
| JUL 7 | 24.0°C | 21.9°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 | 2°C | 5°C |
| February | 0°C | 1°C | 4°C |
| March | 0°C | 3°C | 7°C |
| April | 4°C | 9°C | 15°C |
| May | 11°C | 15°C | 19°C |
| June | 15°C | 19°C | 22°C |
| July | 18°C | 24°C | 30°C |
| August | 20°C | 25°C | 29°C |
| September | 18°C | 23°C | 27°C |
| October | 10°C | 15°C | 19°C |
| November | 4°C | 8°C | 12°C |
| December | 0°C | 4°C | 6°C |
Rio Reservoir: Water Temperature by Location
Rio Reservoir: Weather Forecast
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July 6
Location & Local Information
Rio Reservoir in New York typically behaves like many small northeastern reservoirs: surface water temperatures vary a lot through the year and stratification can keep deeper water substantially colder than the surface. Typical seasonal surface ranges are roughly 32–39°F (0–4°C) in winter when ice forms, 40–60°F (4–16°C) in spring as the lake mixes and warms, 68–77°F (20–25°C) in summer at the warmest surface layers on sunny, calm days, and 50–65°F (10–18°C) in autumn as the water cools and turnover begins. Even in summer, thermoclines and colder deep water mean sudden temperature changes can occur a short distance from shore; this is important for swimmer comfort and safety.
Swimming access at many New York reservoirs is often restricted or discouraged, and the same caution typically applies to Rio Reservoir. Restrictions arise because some reservoirs are part of municipal water supplies and must be protected from contamination, while others lack lifeguards, beaches, and hazard mitigation; safety concerns include cold-water shock, underwater debris, drop-offs, and occasional harmful algal blooms. Where permitted, swimming is usually unguarded and carries these risks, so checking local regulations and posted signs before entering the water is essential.