Colebrook River Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Colebrook River Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Colebrook River Lake 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 |
|---|---|---|---|
| JUN 23 | 16.8°C | 16.0°C | |
| JUN 24 | 16.9°C | 16.0°C | |
| JUN 25 | 16.9°C | 16.0°C | |
| JUN 26 | 16.9°C | 16.0°C | |
| JUN 27 | 17.1°C | 16.0°C | |
| JUN 28 | 17.2°C | 16.0°C | |
| JUN 29 | 17.4°C | 16.0°C | |
| JUN 30 | 17.4°C | 16.0°C | |
| JUL 1 | 24.0°C | 18.4°C | |
| JUL 2 | 24.0°C | 18.7°C | |
| JUL 3 | 24.0°C | 19.0°C | |
| JUL 4 | 24.0°C | 19.3°C | |
| JUL 5 | 24.0°C | 19.6°C | |
| JUL 6 | 24.0°C | 19.9°C | |
| JUL 7 | 24.0°C | 20.2°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 | 2°C | 5°C |
| March | 0°C | 4°C | 9°C |
| April | 2°C | 6°C | 11°C |
| May | 9°C | 12°C | 16°C |
| June | 13°C | 16°C | 19°C |
| July | 18°C | 24°C | 30°C |
| August | 20°C | 22°C | 25°C |
| September | 19°C | 22°C | 25°C |
| October | 14°C | 17°C | 19°C |
| November | 8°C | 12°C | 15°C |
| December | 4°C | 7°C | 10°C |
Colebrook River Lake: Water Temperature by Location
Colebrook River Lake: Weather Forecast
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Location & Local Information
Colebrook River Lake, a reservoir in northwestern Connecticut, experiences pronounced seasonal variation in surface water temperature. In spring the lake is cool, typically around 40–60°F (4–15°C) as melting and runoff dominate. Summer brings the warmest conditions, with surface readings commonly in the 70–80°F range (21–27°C) on warm, sunny days—though deeper water remains cooler. Early fall sees a gradual decline to roughly 50–65°F (10–18°C) as air temperatures drop and the lake begins to thermally mix. In winter the surface can approach freezing, about 32–40°F (0–4°C), and parts of the lake may develop ice cover depending on weather, making open-water swimming unsafe.
Swimming at Colebrook River Lake is not generally set up as a staffed municipal beach and access is governed by rules from the land manager; recreational swimming may be allowed in certain areas when posted, but it is often limited or discouraged because the reservoir’s primary function is flood control. Fluctuating water levels, steep drop-offs, underwater hazards, and the absence of lifeguards make unsupervised swimming risky. Visitors should follow on-site signage and local regulations, exercise caution around cold or rapidly changing water, and treat swimming as a self-responsibility activity rather than a supported amenity.