Global Ocean Temperatures Hit Record 21.1°C, Copernicus Warns of Growing Risk
- Copernicus recorded a new global ocean temperature high of 21.1°C on 22 August, surpassing the previous daily record
- The record was set months earlier than expected in the seasonal cycle, raising concern ahead of the Southern Hemisphere's warmest period
- A Copernicus climate expert warned that El Niño is compounding decades of human-driven warming, threatening marine ecosystems and coastal communities
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Global ocean temperatures climbed to a record 21.1°C on 22 August, according to the European Earth observation agency Copernicus, surpassing the previous daily record of 21.09°C logged in March 2024.
According to News24, Copernicus attributed the milestone to a combination of human-caused climate change and a developing El Niño weather pattern in the tropical Pacific. The timing of the record is particularly notable. Ocean surface temperatures in the Southern Hemisphere typically peak between March and April, at the close of the Austral summer.
What the record means for southern hemisphere nations
A new high recorded in late August suggests an unusual build-up of heat before the region's warmest months have even begun, a development with direct implications for countries like South Africa, which is bordered by both the Atlantic and Indian oceans.
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Samantha Burgess, strategic lead for climate at Copernicus' European Centre for Medium-Range Weather Forecasts, said El Niño was layering additional heat on top of decades of human-driven warming. She noted that elevated ocean temperatures heighten risks for marine ecosystems and the coastal communities that depend on them.
Warming oceans fuel a chain of consequences
Higher sea-surface temperatures set off a broader chain of environmental consequences. Warmer water accelerates sea level rise and draws greater volumes of moisture into the atmosphere, a process that intensifies storms and amplifies heat on land. At the same time, the ocean's ability to absorb carbon dioxide weakens, reducing one of the planet's primary mechanisms for moderating atmospheric warming.
Isolated but significant temperature records have also been observed in specific regions, including the western Mediterranean Sea and around the Earth's poles. Copernicus projects that this warming trajectory will continue as El Niño sustains its influence on global ocean metrics.
View a post from the South African Weather Service about El Niño on Facebook:
Mzansi reacts to El Niño update
In a related article, Briefly News reported on the brewing El Niño pattern in South Africa, as outlined by The Weather Girls in a TikTok video posted on July 6, 2026. Forecasters suggest there is a 63% chance this pattern could develop into a very strong Super El Niño by late 2026, leading to extreme weather conditions including intense heat and severe storms.
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Source: Briefly News
