Global Ocean Surface Temperature Hits All-Time Record as El Niño Intensifies

Europe's Copernicus Climate Change Service recorded a global average sea-surface temperature of 21.1°C (70°F) on Aug 21-22, 2026 — the highest daily reading in the agency's satellite record since 1979, surpassing the previous mark of 21.09°C set in March 2024. The new record is unusual because global ocean temperatures typically peak in March-April, not August, underscoring how far the rapidly intensifying El Niño is pushing conditions beyond seasonal norms. Copernicus strategic lead for climate Samantha Burgess said El Niño is 'adding heat to the system, but it is doing so on top of decades of human-driven warming.' Scientists warn the elevated temperatures raise the risk of marine heatwaves, coral bleaching, reduced ocean carbon absorption, and amplified extreme weather as the event is forecast to keep intensifying through the Nov 2026-Jan 2027 peak.