April 2026 records second-highest sea surface temperatures ever observed for the world’s oceans outside the polar regions, according to the latest update from the Copernicus Climate Change Service, implemented by the European Center for Medium-Range Weather Forecasts. The month also ranked as the joint third-warmest April globally, showing that ocean and atmospheric warming remain at unusually high levels.

The global average sea surface temperature across extra-polar oceans, between 60°S and 60°N, reached 21.00°C in April 2026. This was the second-highest April value on record, behind April 2024, when the last El Niño event helped push ocean temperatures to record levels.

What Drove the Ocean Heat?

• Marine heatwaves intensified: Large parts of the tropical Pacific recorded unusually high sea surface temperatures, with strong marine heatwave conditions developing during the month.
• El Niño conditions emerged: Copernicus experts noted that daily sea surface temperatures moved closer to 2024 record levels, reflecting a transition from ENSO-neutral conditions toward El Niño.
• Pacific warming stood out: Record-high temperatures were observed across a broad region from the central equatorial Pacific to the western coast of the United States and Mexico.
• Atmospheric heat remained high: April 2026 was also the joint third-warmest April globally, showing that high ocean temperatures were matched by unusually warm air temperatures.
• Arctic sea ice declined sharply: Arctic sea ice extent was around 5% below average, making it the second-lowest April extent in the satellite record.

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Europe Saw Sharp Regional Contrasts

Europe experienced a mixed climate picture in April 2026. Southwestern Europe recorded above-average temperatures, while much of eastern Europe was colder than usual. Western and central Europe were also much drier than normal because of a persistent anticyclone, a high-pressure system that often brings dry, settled, and warmer conditions.

In contrast, wetter-than-normal conditions were reported in several parts of eastern and southeastern Europe, along with the United Kingdom, Ireland, Iceland, parts of Spain and Italy, and the Caucasus. Outside Europe, above-average precipitation affected parts of the northeastern and central United States, Canada, northern Mexico, the Arabian Peninsula, Afghanistan, southern China, Brazil, Japan, southern Africa, and New Zealand.

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Why This Matters

Rising sea surface temperatures can intensify marine heatwaves, disrupt fisheries, damage coral ecosystems, and influence global weather patterns. Warmer oceans also provide more energy for extreme weather events and can affect rainfall, drought, and storm behavior across regions.

Key April 2026 Climate Statistics

Final Takeaway

April 2026 records second-highest sea surface temperatures, adding another warning sign to the global climate record. With extra-polar ocean temperatures reaching 21.00°C, Arctic sea ice falling to its second-lowest April extent, and El Niño conditions emerging, the latest data shows that ocean heat remains a major driver of global climate extremes.

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