Oceans Hit Record 21.1°C Daily High
- Global ocean surface temperatures reached 21.1°C on 22 August, setting the highest daily average since records began.
- The new figure surpasses the previous record of 21.09°C, which was set in March 2024, by a margin of 0.01°C.
- The Copernicus Climate Change Service confirmed the record, which excludes polar regions from its global measurement.
The world's oceans registered their highest ever recorded daily surface temperature on 22 August, with the global mean sea surface temperature — excluding polar regions — reaching 21.1°C, according to the Copernicus Climate Change Service. The new figure narrowly surpasses the previous record of 21.09°C, which was set in March 2024.
A Record Broken by the Slimmest of Margins
The announcement, made on Monday, places the latest peak just 0.01°C above its predecessor — a margin that, while narrow, is nonetheless a statistically meaningful threshold in climate science. The measurement is taken across global ocean surfaces and excludes the Arctic and Antarctic poles, providing a standardised basis for comparison with historical data.
The new record is part of a broader pattern of sustained ocean warming that has produced successive highs in recent years. The Copernicus programme, which has been tracking global sea surface temperatures as part of its wider climate monitoring mandate, confirmed the 22 August figure as the highest single-day average in the observational record.
What the Data Does Not Yet Tell Us
The source material does not address the causes behind the new record or its implications for weather systems, marine ecosystems, or the broader climate. Those questions remain, for now, outside the scope of what has been confirmed. What is established is that the planet's oceans have, once again, reached a new thermal threshold — and that the distance between successive records continues to narrow.
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