Marine heatwave Bulletin Forecasts for October 25, 2025 by Mercator International

Marine heatwave categories forecast for 25 October, 2025. Global Ocean. Credit: Mercator Ocean International

Key takeaways

  • European zone – stable conditions.
  • South Pacific – marine heatwave developing off the coast of Chile around 30°S.
  • Tropical Pacific – Philippine Sea and Indonesia regions are seeing an increase in intensity of the local marine heatwave, which remains stable in surface area.
  • Indian Ocean – decreasing intensity and extent of the marine heatwave.
Marin heatwave categories forecast for 25 October, 2025. Global Ocean. Credit: Mercator Ocean International

Tropical Atlantic

The marine heatwave in the Gulf of Mexico and the Caribbean Sea is decreasing in intensity and is now mostly in the moderate category. The marine heatwave around 30°W is increasing in extent but remains moderate overall.