Marine heatwave Bulletin
Forecasts for 1 August 2026​

Europe Zone

Marine heatwave category forecasts for 1 August, 2026 around Europe. Data: GLO12 forecast. Source: Mercator Ocean International.

Mediterranean Sea

The marine heatwave located in the basin is decreasing in area and intensity, only a few areas of moderate to strong intensities remain west.

North Atlantic

The marine heatwave affecting the area north of the British Isles to the West of Morocco remains stable is intensity but is decreasing in extent. 

Global Ocean

Marine heatwave category forecasts for 1 August, 2026 for the Global Ocean. Data: GLO12 forecast. Source: Mercator Ocean International.

North Atlantic

The marine heatwave extending from center of the Atlantic all the way to Cuba is decreasing in extent but is increasing in intensity north of the Caribbeans. 

Pacific

• The marine heatwave in the southern Bering Sea (around 50°N) is expanding in extent but remains stable in intensity, with conditions still ranging from moderate to strong. 
• The marine heatwave in the Sea of Japan is decreasing in intensity north of the island to reach moderate intensities, and is increasing in intensity in the South to reach strong intensities. 
• The marine heatwave extending across nearly the entire equatorial axis from 30°S to 30°N is receding between 150°E and 180°E where only a few areas of moderate intensity remain, and is increasing in intensity between 90°W and 120°W to reach extreme intensities in a few areas. 
• The marine heatwave south of New Zealand remains stable in extent and intensity. 

Indian Ocean

Marine heatwaves in the basin (west of Madagascar, in the Arabian Sea, and in the central part of the basin) remain generally stable in terms of intensity, with conditions still ranging from moderate to strong, and are decreasing in extent on the eastern side of the basin. 

Southern Ocean

The marine heatwave, extending from 50°E to 80°E in longitude and 45°S to 60°S in latitude, remains stable in both area and intensity, with conditions still ranging from moderate to strong.