Global ocean temperatures reached unprecedented levels earlier this month, according to data released by the European Union’s Copernicus Climate Change Service. The average surface temperature across oceans outside polar regions climbed to 21.1 degrees Celsius, surpassing all previous records in the satellite era, which began in 1979.
Scientists attribute the surge to a combination of long-term climate trends and natural climate variations. The vast majority of heat trapped by carbon dioxide emissions from fossil fuels is absorbed by the oceans, and this human-driven warming has accumulated over decades. An emerging El Niño event is compounding these effects by raising global temperatures and altering weather patterns. Officials noted that the timing of this record is particularly significant, as ocean temperatures typically peak later in the year following the austral summer, when the southern hemisphere—which contains considerably more ocean area than the northern hemisphere—experiences its warmest period.
The consequences of elevated ocean temperatures are already manifesting across multiple systems. Warmer seas contribute to thermal expansion of water, raising sea levels and increasing flood risks for coastal regions and island nations. Higher ocean temperatures also intensify extreme weather by transferring additional energy and moisture to the atmosphere, amplifying rainfall and storm strength. Marine heatwaves have proliferated dramatically, with the number of global marine heatwave days more than tripling since the early 1990s, devastating marine ecosystems and threatening livelihoods dependent on fishing and coastal industries.
Additionally, warming oceans reduce the efficiency of a critical natural carbon buffer. As seawater temperatures rise, the ocean’s capacity to absorb atmospheric carbon dioxide diminishes, potentially weakening planetary defenses against continued warming. Scientists and environmental advocates have emphasized that addressing this crisis requires dual approaches: rapidly reducing fossil fuel emissions and protecting marine and coastal ecosystems such as kelp beds, mangroves, coral reefs, and marshes, which absorb carbon and provide storm protection. More than 190 governments have committed to protecting and conserving at least 30 percent of the planet by 2030.
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