According to the State Meteorological Agency (Aemet), the surface temperature of the Mediterranean remained above the average for the reference period 1991-2020 during most of 2024 and 2025.
The Ocean Heat Content (OHC), one of the best long-term indicators of climate change, reached the highest level ever recorded in 2025.
Aemet published on the social network X that values close to normal were only registered sporadically in late July, early August, and mid-October during the two years analyzed.
This trend aligns with global data. The journal Advances in Atmospheric Sciences reported that the Earth's oceans stored more heat in 2025 than in any other year since modern measurements began, reaching a new historic maximum for the tenth consecutive year.
The study, which combines data from international centers such as Copernicus Marine and NOAA/NCEI, confirms that warming is uneven, with the warmest areas being the South Atlantic, the Tropical Ocean, the North Pacific, and the Southern Ocean. Waters around the Canary Islands, in the Atlantic, also showed predominantly above-average temperatures.
