North Atlantic (Europe region): The heatwave along the British Isles and south of the Brittany coast is increasing in both extent and intensity, with locally strong and severe categories observed.
Tropical Atlantic: The marine heatwave in the Gulf of Mexico and south of Cuba is increasing with the emergence of strong and locally severe categories.
Indian Ocean: The marine heatwave in the Bay of Bengal is reducing in both extent and intensity.
The marine heatwave along the British Isles and south of the Brittany coast is increasing in both extent and intensity, with locally strong and severe categories observed. The marine heatwave in the Norwegian Sea is decreasing in extent, and its intensity is shifting to the moderate category.
The marine heatwave in the Gulf of Mexico and south of Cuba persists in extent but decreases in intensity, with moderate and locally strong categories observed. The marine heatwave east of Florida is decreasing in extent but increasing in intensity, with the emergence of strong and locally severe categories.
The marine heatwave in the Gulf of Mexico and south of Cuba is increasing in extent and intensity, with the emergence of the strong and locally severe categories. The marine heatwave east of Florida is decreasing in extent and remains at moderate, strong, and locally severe categories.
The marine heatwave in the central basin around 30°N is increasing in both extent and intensity, with most of the area falling within the strong categories. The one in the Sea of Okhotsk is persisting in extent, with its intensity shifting to the moderate category. The marine heatwave in the Sea of Japan is decreasing in extent, with its intensity shifting to the moderate category.
The marine heatwave in the Bay of Bengal is decreasing in both extent and intensity, with the presence of the moderate category.
Mean sea surface temperature for the week 16 – 23 August 2025
| North Atlantic | -2°C to 3°C |
| Tropical Atlantic | -2°C to 2°C |
| Tropical Pacific | 0°C to 2°C |
| North Pacific | -3°C to 2°C |
| Indian | -3°C à >3°C |
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Datasets and products: Global Ocean Physics Analysis and Forecast (sea surface temperature) E.U. Copernicus Marine Service/ Mercator Ocean International. https://doi.org/10.48670/moi-00016
