Marine heatwave Bulletin Forecasts for October 11, 2025 by Mercator International

Marine Heatwave Category Map 10/11/2025

Key takeaways

  • Mediterranean Sea: decreasing intensity and extent of the marine heatwave in the whole basin.
  • Tropical Atlantic : overall stability and decrease in marine heatwave categories and extent in the region.
  • Indian Ocean : a marine heatwave is developing in the region with strong to severe categories and locally extreme.

North Tropical Atlantic 

The marine heatwave in the Gulf of Mexico and in the Caribbean Sea remains stable with strong category. The marine heatwave extent around 30°W and near the equator decreases, only a few scattered areas remain.

SSTA Week Oct 5-11, 2025
Mediterranean Sea-1°C à 2°C 
Tropical Atlantic-1°C à 1.5°C 
North Pacific -1°C à 2.5°C 
Tropical Pacific-3°C < 3°C 
Indian Ocean-1°C à 1.5°C