The world’s oceans have reached their highest average surface temperature in the modern observational record, providing another measure of how much heat has accumulated in Earth’s climate system — just as an unusually powerful El Niño intensifies across the Pacific.
Earth’s oceans have set another climate record, with the daily global average sea surface temperature reaching 21.1 C (70 F) on Aug. 22, according to the European Union’s Copernicus Climate Change Service. The measurement, averaged across the extra-polar oceans between 60 degrees north and 60 degrees south, narrowly surpassed the previous record of 21.09 C set in March 2024.
The number is more than another entry in a growing list of temperature records. The ocean is Earth’s primary heat reservoir. The World Meteorological Organization reports that about 90% of the energy accumulated in the climate system since 1971 has been stored in the ocean. As that energy accumulates, warming seawater expands and contributes to rising sea levels, while elevated temperatures place additional stress on marine ecosystems.
The new record also comes as El Niño strengthens across the tropical Pacific. NOAA’s Climate Prediction Center said Aug. 13 that there is a greater than 90% chance the event will become “very strong” during the Northern Hemisphere fall and winter of 2026-27. NOAA calculates a 69% chance that the October-December period could exceed the strength of previous El Niño events in its record dating to 1950.
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That distinction matters. The record ocean warmth is an observation; El Niño’s eventual peak remains a forecast.
El Niño is a natural climate cycle characterized by unusually warm waters in the central and eastern equatorial Pacific, but this event is occurring against a much warmer planetary background. Reuters reported that forecasters expect the current event to rank among the strongest on record, potentially increasing the likelihood of disruptive weather patterns around the world.
Warm oceans can affect the climate system in several ways. Thermal expansion raises sea levels, while warmer surface waters increase evaporation and can provide additional moisture and energy to storms. Marine heat waves also threaten coral reefs and other ecosystems.
Futurism reported that University of Ottawa environmental studies professor Ryan Katz-Rosene suggested the current ocean temperatures could be unprecedented during the Holocene and possibly since the last interglacial period roughly 125,000 years ago. That assertion has not been verified as an observational finding by Copernicus or NOAA and should be regarded as an interpretation rather than an established record.
What is established is striking enough: the ocean surface has reached a new measured high while one of the planet’s most powerful natural climate cycles is still strengthening.
The heat stored beneath the waves may be becoming one of the clearest measures of how much the climate system has already changed.
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