Alto Tâmega Dam — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Alto Tâmega Dam, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Alto Tâmega Dam today is 18.8°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 | 18.5°C | 18.0°C | |
| JUN 24 | 19.7°C | 18.0°C | |
| JUN 25 | 19.7°C | 18.0°C | |
| JUN 26 | 19.7°C | 18.0°C | |
| JUN 27 | 19.7°C | 18.0°C | |
| JUN 28 | 18.4°C | 18.0°C | |
| JUN 29 | 18.4°C | 18.0°C | |
| JUN 30 | 18.4°C | 18.0°C | |
| JUL 1 | 20.0°C | 18.9°C | |
| JUL 2 | 20.0°C | 18.9°C | |
| JUL 3 | 20.0°C | 19.0°C | |
| JUL 4 | 20.0°C | 19.0°C | |
| JUL 5 | 20.0°C | 19.1°C | |
| JUL 6 | 20.0°C | 19.2°C | |
| JUL 7 | 20.0°C | 19.2°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 | 4°C | 8°C | 10°C |
| February | 4°C | 7°C | 11°C |
| March | 7°C | 10°C | 13°C |
| April | 9°C | 13°C | 17°C |
| May | 12°C | 17°C | 21°C |
| June | 14°C | 18°C | 23°C |
| July | 16°C | 20°C | 25°C |
| August | 17°C | 21°C | 26°C |
| September | 14°C | 18°C | 23°C |
| October | 11°C | 15°C | 18°C |
| November | 8°C | 12°C | 15°C |
| December | 4°C | 8°C | 11°C |
Alto Tâmega Dam: Weather Forecast
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July 4
Location & Local Information
The Alto Tâmega Dam reservoir, located in Vila Real District in northern Portugal, tends to have cool to moderately warm surface temperatures that reflect its mountain-fed inflows and relatively deep waters. Typical seasonal surface-temperature ranges are roughly 6–10 °C (43–50 °F) in winter, 8–15 °C (46–59 °F) in spring, 18–24 °C (64–75 °F) in summer, and 10–18 °C (50–64 °F) in autumn. These values can vary with air temperature, solar exposure, reservoir depth and water release patterns; deeper or newly filled zones remain colder, while sheltered shallows warm more in summer. Rapid weather changes and inflows can produce significant short-term variability.
Swimming in the Alto Tâmega reservoir is generally not promoted as an official bathing activity. The site is part of a hydroelectric scheme, so water levels and flows can change quickly for operational reasons, creating strong currents, sudden drawdowns and hidden underwater hazards that pose safety risks. In addition, many reservoirs are not monitored or classified as regulated bathing waters for water quality, which means authorities often discourage recreational swimming. Some people do swim informally in calmer areas during warm months, but official guidance typically advises against it because of safety and regulatory concerns.