Ulldecona Dam — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Ulldecona Dam, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Ulldecona Dam today is 19.9°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 3 | 19.4°C | 26.7°C | |
| JUN 4 | 19.4°C | 26.7°C | |
| JUN 5 | 19.4°C | 26.7°C | |
| JUN 6 | 19.4°C | 26.7°C | |
| JUN 7 | 19.9°C | 26.7°C | |
| JUN 8 | 19.9°C | 26.7°C | |
| JUN 10 | 19.9°C | 26.7°C | |
| JUN 11 | 26.7°C | 20.2°C | |
| JUN 12 | 26.7°C | 20.6°C | |
| JUN 13 | 26.7°C | 20.9°C | |
| JUN 14 | 26.7°C | 21.3°C | |
| JUN 15 | 26.7°C | 21.6°C | |
| JUN 16 | 26.7°C | 21.9°C | |
| JUN 17 | 26.7°C | 22.3°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 | 11°C |
| February | 6°C | 10°C | 13°C |
| March | 7°C | 11°C | 14°C |
| April | 9°C | 13°C | 18°C |
| May | 13°C | 19°C | 24°C |
| June | 19°C | 27°C | 34°C |
| July | 21°C | 26°C | 32°C |
| August | 22°C | 27°C | 33°C |
| September | 20°C | 25°C | 30°C |
| October | 13°C | 18°C | 21°C |
| November | 9°C | 13°C | 17°C |
| December | 7°C | 11°C | 14°C |
Ulldecona Dam: Water Temperature by Location
Ulldecona Dam: Weather Forecast
June 9
June 10
June 11
June 12
June 13
June 14
Location & Local Information
The reservoir known locally as Embalse de Ulldecona typically shows a clear Mediterranean seasonal pattern in surface water temperature. In winter the surface usually falls to roughly 8–12 °C (46–54 °F), spring brings gradual warming to about 12–18 °C (54–64 °F), and summer months—especially July and August—can see surface temperatures rise into the range of 20–28 °C (68–82 °F). In autumn temperatures decline again to roughly 14–22 °C (57–72 °F). These values vary year to year depending on rainfall, inflow, and weather; deeper layers remain cooler than surface readings and can create strong thermal stratification during hot, dry summers.
Swimming in reservoirs such as the Embalse de Ulldecona is subject to local rules and practical concerns. Many reservoirs are managed for water supply, irrigation, or flood control, so official bathing may be restricted to protect water quality and infrastructure; safety issues — steep banks, sudden depth changes, submerged obstacles and boat traffic — also lead authorities to limit or regulate access. Where swimming is permitted, it is most comfortable in the warmest summer weeks when surface temperatures reach the mid-20s °C (mid-70s °F). Visitors should check on-site signage or local regulations before entering the water and take standard open-water safety precautions.