Global average sea-surface temperatures outside the polar regions reached the highest level ever recorded for the month of July [1].
This surge in ocean heat signals an intensification of climate-driven warming that threatens marine ecosystems and influences global weather patterns. Because the oceans absorb the vast majority of excess heat from greenhouse gas emissions, these records serve as a critical indicator of planetary warming.
Scientists from the EU's Copernicus Climate Change Service said the findings this week [1], [2]. The data shows that the average temperature for July 2026 surpassed the previous July record set in 2023 [1]. This warming was not uniform across the globe, but specific regions experienced extreme spikes.
Record-breaking temperatures were observed along the Atlantic coast of Europe and within the western Mediterranean Sea [2]. These areas faced severe marine heatwaves, prolonged periods of anomalously high temperatures that can devastate coral reefs and displace fish populations [1], [3].
Researchers said the record-breaking heat was due to the overarching effects of climate change [1]. A strong El Niño event also contributed to the spike, as this natural climate pattern releases vast amounts of heat from the ocean into the atmosphere [1], [4].
While the global average for July was the primary focus, some reports indicate that the broader window of June and July together also represented the hottest such period on record for certain regions [3]. The combination of atmospheric warming and ocean heat creates a feedback loop that can intensify summer heatwaves on land.
“Global average sea-surface temperatures outside the polar regions reached the highest level ever recorded for the month of July”
The breach of the 2023 record suggests that ocean warming is accelerating despite global efforts to curb emissions. The synergy between long-term climate change and short-term events like El Niño creates a 'compounding effect,' where natural variability pushes an already warmed system into unprecedented territory. This increases the risk of mass bleaching events for marine life and provides more energy for the development of more intense tropical storms.
