Ongoing marine heatwave in the Atlantic Ocean and Mediterranean Sea
In late May 2026, several countries in Western Europe faced above-average temperatures. During the same period, large areas of the Atlantic Ocean and the Mediterranean Sea also recorded above-average sea surface temperatures.
This data visualisation, based on data from the Copernicus Marine Service, shows sea surface temperature anomalies on 30 May 2026. Areas in red and dark red indicate warmer than average waters, which extend along the northern and western coasts of France and across parts of the western Mediterranean Sea, and anomalies in excess of 5°C above the usual temperatures for this time of year.
Copernicus Marine Service data provide timely information for monitoring ocean conditions, including marine heatwaves, and support environmental assessment, maritime safety, and climate-related decision-making.
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