EU’s Copernicus: Above-average sea surface temperatures across European seas at the end of June 2026

After the marine heatwave of the end of May 2026, the intense temperatures which affected western and central Europe during the ten-day period of June caused further warming of the surrounding seas, the EU’s Copernicus Marine Service said.

This data visualisation, based on data from the Copernicus Marine Service, shows sea surface temperature anomalies on June 29 2026.

(Credit: European Union, Copernicus Marine Service Data)

The red and dark red tones show areas where  sea surface temperatures above the long-term average were recorded.

The largest anomalies reached approximately 6°C in the western Mediterranean Sea, particularly in the Gulf of Lion off the coast of southern France, and in the Ligurian and Tyrrhenian seas along the western coast of Italy.

Sea surface temperature anomalies also increased markedly in the southern North Sea and the Baltic Sea compared with late May.

(Main photo: Clive Leviev-Sawyer)