Ocean surface temperatures hit a record high for June
Global ocean surface temperatures reached a record high for June, continuing a trend of unprecedented warmth in the world's seas. Scientists warn that the elevated temperatures pose serious risks to marine ecosystems and could intensify extreme weather events.
Background
Ocean surface temperatures measure the heat of the top few meters of seawater — distinct from overall ocean heat content (which also measures deeper layers). Even small increases in sea surface temperature have major effects: they fuel stronger hurricanes/cyclones, stress and kill marine life (e.g., coral bleaching), and reduce the ocean's ability to absorb CO₂, accelerating global warming. The Atlantic hurricane season runs June–November, so a record-hot ocean at the *start* of the season primes the atmosphere for more intense storms. These readings come from NOAA and other global monitoring agencies, which track sea surface temperatures as a core climate indicator. The long-term driver is the buildup of greenhouse gases from human activity, though short-term natural patterns like El Niño can temporarily boost temperatures. This specific June record follows a string of monthly records set in 2023 and 2024, extending a trend that scientists say is unprecedented in modern观测 (modern record-keeping).