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 24/06/2025

Tropical Atlantic

The marine heatwave in the Gulf of Mexico and South of Cuba is decreasing in extent, but its intensity with strong to sever categories. . 

North Pacific

The marine heatwave in the central basin around 30°N increases in intensity with strong to severe and locally extreme categories. In the Japan Sea a marine heatwave is developing with strong category. Off the coast of Canadian the marine heatwave decreases in extent but the strong category extent increases. 

North Atlantic	-2°C to 3°C
Mediterranean Sea	-1°C to 3°C
Tropical Atlantic	-1°C to 1°C
North Pacific	-0°C à 3°C
Indian Ocean	-3°C to 1°C

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