Aixolako Urtegia Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Aixolako Urtegia Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Aixolako Urtegia Lake today is 20.5°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 |
|---|---|---|---|
| SEP 13 | 21.3°C | 20.0°C | |
| SEP 14 | 21.2°C | 20.0°C | |
| SEP 15 | 20.6°C | 20.0°C | |
| SEP 16 | 20.9°C | 20.0°C | |
| SEP 17 | 22.3°C | 20.0°C | |
| SEP 18 | 21.3°C | 20.0°C | |
| SEP 19 | 21.2°C | 20.0°C | |
| SEP 20 | 21.0°C | 20.0°C | |
| SEP 21 | 20.0°C | 20.5°C | |
| SEP 22 | 20.0°C | 20.5°C | |
| SEP 23 | 20.0°C | 20.4°C | |
| SEP 24 | 20.0°C | 20.4°C | |
| SEP 25 | 20.0°C | 20.4°C | |
| SEP 26 | 20.0°C | 20.4°C | |
| SEP 27 | 20.0°C | 20.3°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 | 4°C | 8°C | 12°C |
| March | 7°C | 11°C | 14°C |
| April | 10°C | 14°C | 18°C |
| May | 10°C | 16°C | 22°C |
| June | 14°C | 20°C | 25°C |
| July | 16°C | 21°C | 26°C |
| August | 17°C | 22°C | 27°C |
| September | 14°C | 20°C | 25°C |
| October | 11°C | 15°C | 19°C |
| November | 6°C | 10°C | 15°C |
| December | 4°C | 8°C | 12°C |
Aixolako Urtegia Lake: Water Temperature by Location
Aixolako Urtegia Lake: Weather Forecast
September 21
September 22
September 23
September 24
September 25
September 26
Location & Local Information
Aixolako Urtegia is a managed reservoir in the Basque Country whose surface water temperatures follow the region’s Atlantic-influenced seasonal pattern. Typical winter temperatures range from about 6–10 °C (43–50 °F), spring values commonly rise to 8–16 °C (46–61 °F), summer surface temperatures usually peak around 18–24 °C (64–75 °F), and autumn cools back toward 10–16 °C (50–61 °F). These figures are approximate and can vary with annual weather, depth, and local inflows; deeper or shaded areas will remain colder year-round.
Swimming in Aixolako Urtegia is generally not encouraged and is often officially prohibited because it is a working reservoir (urtegia) where water quality must be protected and where submerged infrastructure, sudden releases, and steep banks create safety risks. Authorities typically restrict bathing to preserve drinking-water standards and to avoid accidents in areas without lifeguards or safety facilities. While some people may enter the water at their own risk during warm months, anyone considering swimming should consult local signage or municipal rules and be mindful of variable temperatures and hidden hazards.