Marine heatwave Bulletin
Forecasts for 8 November 2025 ​

Key takeaways

  • North Pacific – Region will experience a decrease in overall marine heatwave activity.
  • Tropical Pacific – The marine heatwave off the Australian coast increasesin intensity with moderate and mostly strong categories. In the Philippine Sea marine heatwave activity is decreasing.
  • Tropical Atlantic – Off the African coast, around 8°N, the marine heatwave is increasing with mostly strong and locally severe categories.
Waves

Marine heatwave categories

European Zone

 

Marin heatwave categories forecast for 8 November, 2025. European Zone. Credit: Mercator Ocean International

Mediterranean Sea

The marine heatwave in the western basin remains stable with the moderate category.

 

Global Ocean

Marin heatwave categories forecast for 8 November, 2025. Global Ocean. Credit: Mercator Ocean International

Tropical Atlantic

The extent and intensity of the marine heatwave in the Gulf of Mexico and in the Caribbean Sea decreasing with moderate category. The marine heatwave around 30°W is decreasing in area and intensity, shifting overall to a moderate category. The marine heatwave off the African coast around 8°N is increasing with mostly strong and locally sever categories.

North Pacific

The marine heatwave in the center of the basin is decreasing in extent and in intensity, with moderate and strong categories. The marine heatwave in the East China Sea is decreasing in extent and intensity with moderate to strong categories.

Tropical Pacific

The marine heatwave in the Philippine Sea decreasing in intensity and in extent. The marine heatwave off the Australian coast increase in intensity with moderate and mostly strong categories.

Indian Ocean

The marine heatwave west of Sumatra is decreasing in intensity with moderate to strong categories. The marine heatwave in the Bay of Bengal is decreasing in intensity and only a few scattered areas remain.

Weekly temperature anomalies

 

 

Mediterranean Sea 0°C to 1.5°C
Tropical Atlantic -0.5°C to 2°C
North Pacific  – 2°C to > 3°C
Tropical Pacific < -3°C to 2.5°C
Indian Ocean -1°C to 2°C

Forecasts for 8 November 2025

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NOTES

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