Highest-ever ocean temperature measured as powerful El Niño forms

Scientists recorded the highest ocean temperature ever measured at 70 degrees on August 22, 2026, driven by climate change combined with a powerful El Niño in the tropical Pacific. Higher ocean temperatures increase risks to marine ecosystems and coastal communities by contributing to sea level rise, extreme weather events, and reducing the ocean's capacity to absorb carbon dioxide. The August record is particularly concerning because global ocean temperatures typically peak in March and April, suggesting even higher temperatures may be expected.