Mongabay · Climate & nature

Global Ocean Breaks Records with 100 Days of Heat

The global ocean experienced 100 consecutive days of record heat between June 2 and Sept. 10, a trend experts link to climate change amplified by the current El Niño.

Data shows sea surface temperatures exceeded all previous records for 100 days. Peak temperatures reached 21.18° C (70.12° F). Climate scientist Zachary Labe attributes this to human-induced climate change, noting over 90% of excess heat enters the ocean.

This record heat impacts marine ecosystems, global weather, and ocean-dependent economies. Warming affects surface and deeper ocean layers, altering food chains and impacting fisheries and tourism.

High sea temperatures also exacerbate land-based heatwaves and increase wet bulb temperatures, negatively affecting human health by hindering the body's ability to cool.

The current "very strong" El Niño is amplifying the warming trend caused by climate change. El Niño is a natural phenomenon that raises global temperatures.

Scientists expect El Niño to peak in late 2026. However, the underlying warming trend from climate change remains the primary concern.

Experts stress the need to reduce greenhouse gas emissions. Global temperatures are projected to surpass the 1.5° C threshold soon, leading to more dangerous climate impacts.

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