Global sea surface temperatures have reached a record high, raising serious concerns for global Earth systems, according to new data released by the European Union’s Copernicus Climate Change Service (C3S). On Aug. 22, the daily global average sea surface temperature, outside polar regions, reached 21.1° Celsius (69.98° Fahrenheit), exceeding the previous record set in March 2024 of 21.09° C (69.96° F). Even small temperature increases represent a huge gain in heat energy in the ocean because of its vast volume, noted the 2025 European state of the climate report. In 2025, too, the global ocean heat content — that is, the total amount of heat stored in the ocean — reached a new record high, passing the previous record set in 2024. The increase in ocean warming is having far-reaching consequences. “Our [latest] report highlights how sea surface temperatures contribute to sea-level rise, increase the likelihood and intensity of marine heatwaves, put critical ecosystems such as coral reefs and seagrass under greater stress, and threaten fisheries and food security,” Samantha Burgess told Mongabay in an email. Burgess is the strategic lead for climate with the C3S at the European Centre for Medium-Range Weather Forecasts, which produced the report. She added that increased sea surface temperatures “can also increase the potential for some extreme weather events, putting coastal communities at risk, all the while reducing the ocean’s ability to act as a carbon sink for the planet.” The world’s oceans have absorbed more than 90% of the excess heat produced by…This article was originally published on Mongabay

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