From the Cantabrian Sea to the Balearics, Spanish waters ended May with temperatures never before seen at this time of year. Measurements taken by Puertos del Estado show record highs for this month along much of the coastline, after an episode of exceptional heat that also sent temperatures soaring on land.

According to the public body (source in Spanish), sea-water temperatures have reached "new records" in May, surpassing the previous maximum values recorded for this month. In total, 18 of the 29 buoys in its network registered exceptionally high temperatures.

Specifically, 12 of the 15 buoys in the Offshore Network and 6 of the 14 in the Coastal Network recorded their highest values since their respective data series began. The records were spread across much of Spain’s coastline. All the buoys located off Galicia and in the Cantabrian Sea reached all-time highs, as did numerous stations in the Mediterranean.

Record highs in the Balearics

The highest value across the whole network was recorded at the Mahón buoy, off Menorca, which reached 26.58 ºC on 27 May. It was followed by the Dragonera buoy, also in the Balearics, with 26.2 ºC on the 30th.