The marine heatwave bulletin provides forecasts and analysis of marine heatwave events across the globe and throughout the year. Used datasets include observations (satellite sea surface temperature maps) and numerical model analyses (assimilating satellite and in situ observations) to derive marine heatwave forecasts for a 10-day period. This week’s forecasts were produced using as a comparison the marine heatwave situation on 08/07/2025.

North Atlantic

The marine heatwave stretching from eastern Florida to the central basin continues to persist in size, with an expansion of areas classified as strong and, in some places, severe and extreme.

Tropical Atlantic

The marine heatwave in the Gulf of Mexico and south of Cuba persists in extent and is increasing in intensity, with the emergence of strong and locally severe and extreme categories. 

North Atlantic	-2°C to >3°C
Mediterranean Sea	-1°C to >3°C
Tropical Atlantic	-2°C to 2°C
North Pacific	-3°C < à >3°C
Indian Ocean	-3°C to 2°C

Access the Daily Global Physical Bulletin for a 9-day forecast here.