Bay of Biscay Water Temperature Today & Regional Overview
We find every place where you can swim and show you the water temperature there today and throughout the year.
Current Water Temperature
The water temperature in the Bay of Biscay today ranges from 14.1°C (Ouessant, France) to 21.4°C (Biscarrosse, France).
As of today, the minimum water temperature in the Bay of Biscay ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear.
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.
Sea Temperature Trends
Over the past month, the water temperature in the Bay of Biscay has remained almost unchanged. In general, the sea water temperature remains within the statistical range for this time of year.
Water Temperature and Swimming Conditions Throughout the Year
| Month | Min | Max |
|---|---|---|
| January | 6°C | 16°C |
| February | 7°C | 14°C |
| March | 7°C | 15°C |
| April | 8°C | 17°C |
| May | 9°C | 21°C |
| June | 12°C | 23°C |
| July | 13°C | 25°C |
| August | 14°C | 25°C |
| September | 13°C | 24°C |
| October | 12°C | 23°C |
| November | 10°C | 20°C |
| December | 8°C | 17°C |
The Bay of Biscay experiences a marked seasonal cycle in sea surface temperature that varies along its coasts. Winter temperatures typically sit between 10 °C and 14 °C, with the coldest readings along the northern French coast and slightly milder values nearer to the Spanish shore. Spring sees a gradual rise, roughly 12 °C to 16 °C, while summer brings the warmest conditions, commonly from about 16 °C to 22 °C and in sheltered southern bays occasionally approaching the low twenties. Autumn cools the waters back toward the mid teens, generally in the range of 13 °C to 18 °C. Local factors such as coastal upwelling, tidal mixing and prevailing winds create notable variation over short distances: exposed Atlantic-facing stretches tend to be cooler and more changeable than protected estuaries or lagoons.
Swimming Conditions
Swimming is allowed and widely practised in the Bay of Biscay, particularly during the warmer months when temperatures are most comfortable for recreational bathing. Many beaches are equipped with lifeguard services and clearly signposted bathing areas, so public swimming is encouraged where conditions permit. However, the bay is also known for strong swell, currents and sudden weather changes, which can make open-water swimming hazardous in places even when temperatures are inviting. In cooler seasons or on exposed coasts the water temperature may be uncomfortably low for prolonged immersion without thermal protection. Swimmers are therefore advised to use designated beaches, heed local warnings and choose sheltered spots if seeking to enjoy the bay’s waters safely.