Highest-ever ocean temperature measured as powerful El Niño forms

Scientists have reported the highest-ever global ocean temperature, a result of climate change intensifying with a powerful El Niño in the Pacific. On August 22, the Copernicus Earth observation agency recorded an average sea-surface temperature of 70 degrees, surpassing the previous record set in March 2024. Samantha Burgess, Copernicus' strategic lead for climate, explained that El Niño is exacerbating the situation by adding heat to an already warmed system.

As ocean temperatures rise, marine ecosystems and coastal communities face heightened risks. The situation amplifies sea level rise and the likelihood of extreme weather events, as warmer water contributes more heat and moisture to the atmosphere. Copernicus predicts the trend will persist, with El Niño currently supercharging ocean temperatures. The August record is particularly alarming as ocean temperatures usually peak in March and April.