2024 holds the record for the warmest global ocean temperatures,with, sea surface temperatures (SST) peaking at an average of 20.87°C (extra-polar). This continued a trend of unprecedented warming that started in April 2023. As of April 2026, temperatures remain at near-record levels—specifically the second-highest for April—at 21°C, trailing only April 2024.

2024 holds the record for the warmest global ocean temperatures,with, sea surface temperatures (SST) peaking at an average of 20.87°C (extra-polar). This continued a trend of unprecedented warming that started in April 2023. As of April 2026, temperatures remain at near-record levels—specifically the second-highest for April—at 21°C, trailing only April 2024.
Key Data Points
Warmest Year: 2024.
April 2026 Status: -
Second-highest for the month, with an average of 21degree C.
Long-term Trend: -
Over 90% of excess heat from greenhouse gases is absorbed by oceans.
Current Drivers: -
Intense marine heatwaves in the equatorial Pacific, driven by a potential.
Rapid Heating: -
The 2023–2024 period saw ocean temperatures exceed the previous 2015–2016 record by an average of 
0.25 °C
Why the Oceans are Trending Warmer:-
The persistent, record-breaking ocean temperatures are largely driven by climate change. 
Absorption of Excess Heat: -
Around 90% of the additional heat trapped in the atmosphere by greenhouse gases is absorbed by the ocean.
El Niño Conditions: -
A transition toward, or continuation of, strong El Niño conditions, such as those expected between May and July 2026, often triggers warmer-than-average sea surface temperatures, particularly in the central and eastern Pacific. 
Specific regional sea surface temperatures (e.g., in the North Atlantic, Indian Ocean)
The impact of El Niño on ocean warming
How marine heatwaves are defined and monitored.
   Sea surface temperature * The annual average sea surface temperature (SST) over the extra-polar ocean reached a record high of 20.87°C in 2024. 
MJF Lion ER YK Sharma 

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