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Hottest ocean temperature recorded as ‘super’ El Nino forms

Scientists have recorded the highest temperature ever measured in the world’s oceans, as climate change combines with a powerful El Nino in the tropical Pacific.
The…

By Samantha Johnson / August 25, 2026

Scientists have recorded the highest temperature ever measured in the world’s oceans, as climate change combines with a powerful El Nino in the tropical Pacific.

The global average sea-surface temperature hit a record 21.1 degrees Celsius (70 Fahrenheit) on August 22, according to Europe’s Earth observation agency Copernicus, which has been tracking the metric daily since 1979. The previous single-day record of 21.09 degrees was measured in March 2024.

“El Nino is adding heat to the system, but it is doing so on top of decades of human-driven warming,” said Samantha Burgess, strategic lead for climate at Copernicus’ European Centre for Medium-Range Weather Forecasts.

“As ocean temperatures continue to rise, the risks to marine ecosystems and coastal communities also increase,” she said.

Higher ocean temperatures contribute to sea level rise and increase the chance of extreme weather events, as warmer water transfers more heat and moisture to the atmosphere, intensifying storms and heat on land. Warmer oceans also have a reduced capacity to absorb carbon dioxide.

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