WMO: Record-Strength El Niño to Peak in December 2026

The El Niño climate pattern building in the Pacific Ocean is on track to become the strongest ever measured, the World Meteorological Organization said Thursday. In its monthly Global Seasonal Climate Update, released October 8, 2026, the WMO warned that El Niño will continue to intensify ahead of a forecast peak in December 2026, with sea surface temperatures reaching levels never before observed. For October, November and December, the seasonal average Niño 3.4 sea surface temperature anomaly is forecast to reach approximately 3.7 degrees Celsius above normal, peaking around December — the highest since observations began.

What the forecast shows

The numbers behind the warning are stark. The Niño 3.4 anomaly — the key measure of El Niño strength — has already climbed from an average of 1.6 degrees Celsius above normal in June 2026 to 2.5 degrees Celsius above normal in August. The previous record, set during November 2015 through January 2016, was 2.6 degrees Celsius above normal, meaning the forecast peak of around 3.7 degrees Celsius above normal would shatter that benchmark. The forecast is a consensus across 13 national and international centres, from Washington to Tokyo to London to Pune, built on real-time ocean buoy, satellite, and radiosonde data coordinated by WMO, according to the agency. All anomalies are measured against the 1993 to 2009 baseline period.

WMO Secretary-General Celeste Saulo did not soften the message. "El Niño is firmly established and strengthening rapidly. WMO forecasts indicate a near-100 per cent likelihood that it will persist through February 2027, potentially being one of the strongest since at least 1950," she said in a statement. Saulo added context on what the pattern actually does: "El Niño doesn't add new heat to the planet. It releases heat the ocean has already been storing beneath the surface," she said. "The ocean it's drawing from is the warmest we've ever measured it. There is simply more heat available to release."

Who gets the rain — and who doesn't

A monster El Niño redraws the global weather map, and the WMO outlook lays out which regions land on which side of the extremes. Wetter-than-normal conditions are forecast for the Greater Horn of Africa, parts of Central and East Asia, the northern Arabian Peninsula, parts of North America, and southeastern South America. Drier-than-normal conditions are expected across the Indian subcontinent, southern Central America, parts of the Caribbean, and northwestern South America. The update also expects a positive Indian Ocean Dipole to peak in October before declining, with the October to December seasonal anomaly forecast at about 0.5 degrees Celsius above normal, while equatorial Atlantic sea surface temperatures are forecast to remain above normal.

Why this matters for you

For a generation already living through climate whiplash, a record El Niño is the kind of event that shows up in everyday life. Heavy rainfall and flooding risks climb across the wetter regions, while drought across the Indian subcontinent, Central America, and the Caribbean can squeeze harvests — and when harvests shrink, food prices climb, from coffee to cooking oil to the produce aisle. In North America, a wetter pattern can mean stronger storms, a disrupted ski season, and travel chaos when atmospheric rivers slam the West Coast or winter systems veer off script in the East. The stakes run highest in the Greater Horn of Africa, where the forecast tilt toward unusually wet conditions threatens flooding in communities still recovering from earlier climate shocks. Flight delays and price swings can follow too, as airlines, hotels, and insurers adjust to a stormier season.

What makes this El Niño especially loaded is the ocean beneath it. Because the world's oceans are the warmest ever measured, the heat the pattern can release into the atmosphere is larger than ever — which is why scientists are watching closely for whether global temperature records could fall again in late 2026 and early 2027. The WMO is expected to refresh its seasonal outlook in November. For now, the message is blunt: this is no ordinary cycle, and the ripple effects on weather, grocery bills, and holiday travel plans are only getting started. Read the WMO's official statement on the strengthening pattern, published October 8, 2026, or see the coverage reported by The Hindu BusinessLine for more detail.