What changed
El Niño has strengthened into record territory weeks before its expected peak in December 2026. Weekly sea-surface temperatures in the central Pacific have exceeded the available record, while daily temperatures in the central-eastern Pacific have surpassed the previous mark set during the powerful 2015 event.
Parts of the tropical Pacific have topped 30C for the first time. Record temperature anomalies, exceptional warmth below the surface and unusually broad ocean heating have also been observed.
Why it matters
This is more than a hot patch in one ocean. El Niño releases heat from the Pacific into the atmosphere, raising global temperatures during an already warming period. That combination is expected to help make 2026 one of the warmest years on record, with unusually high temperatures potentially continuing into 2027.
The warmth is also spreading beyond the traditional El Niño monitoring zone, across the Pacific and into the Gulf of Mexico. That makes this event harder to compare neatly with earlier major episodes in 1972-73, 1982-83, 1997-98 and 2015-16.
Scientists are still cautious about the bigger question. It is not established that climate change is making El Niño events stronger or more frequent. But the current event is unfolding in a warmer ocean, and its eventual effects will depend on where that heat moves and how the pattern develops after its expected December peak.
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