ACC News Brief
Climate Science Global and western Europe
July ocean heat set a record as western Europe had its hottest early summer seas
What happened
Copernicus reports that July 2026 tied July 2024 as the second-warmest July globally in the ERA5 record. Sea-surface temperatures outside the polar regions averaged 20.96 degrees Celsius, the highest July value recorded, while western Europe had its warmest combined June-July sea-surface temperature at 21.62 degrees Celsius.
Why it matters
Warm oceans can intensify marine heat stress, raise coastal temperatures, and influence weather and fisheries. The monthly global air-temperature estimate was about 1.47 degrees Celsius above the 1850-1900 level, but a single month near 1.5 degrees does not mean the Paris Agreement's long-term temperature threshold has been crossed.
What to watch
- How long the western European and Mediterranean marine heat persists into late summer.
- Impacts on marine ecosystems, fisheries, coastal heat, and storm development.
- How later datasets compare with ERA5, which blends observations with model-based reanalysis.
Sources & evidence
- Surface air temperature for July 2026Copernicus Climate Change Service monthly climate bulletin released August 10, 2026, with global air- and sea-surface-temperature indicators based on ERA5 reanalysis.
- Global seas hit hottest July temperature on record, scientists sayGuardian reporting published August 10, 2026, summarizing the Copernicus findings and expert context.
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