New data from the European Copernicus climate change service indicates that the world’s oceans have reached their highest recorded surface temperature at 21.1 degrees Celsius (70 degrees Fahrenheit) outside polar regions. This measurement, taken on a day in late August, surpasses the previous record of 21.09 degrees Celsius established in March 2024 and represents a significant departure from typical temperatures for the season.
Scientists note that the timing of this record is particularly concerning because it occurs well before the expected peak of the El Niño weather phenomenon, which typically strengthens ocean temperatures significantly. El Niño is anticipated to continue intensifying until Christmas time and is forecast to become the strongest in centuries. The phenomenon brings unusually warm waters to the surface of the eastern and central tropical Pacific Ocean, and researchers warn that ocean temperature records may be broken again by early 2027 when El Niño reaches full strength.
The widespread ocean warming extends beyond El Niño’s typical influence zones. Waters around the United Kingdom and Europe have experienced extreme conditions, with the western English Channel maintaining nearly continuous marine heatwave conditions for more than three years, reaching temperatures 7 degrees Celsius above normal in July. Scientists attribute the global pattern of ocean warming to decades of human-caused climate change, with the oceans absorbing more than 90 percent of excess heat trapped by greenhouse gas emissions from fossil fuel burning.
The consequences of elevated ocean temperatures are substantial and multifaceted. Warmer seas can intensify extreme weather events by providing storms with additional moisture and energy, while also raising sea levels and increasing coastal flooding risks. Marine ecosystems face mounting pressure from increased frequency of ocean heatwaves, with coral reefs and other habitats suffering from intense heat exposure. Coastal communities dependent on marine resources face growing challenges as warming waters disrupt marine ecosystems and their biological productivity.
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