The Pacific Is About to Unleash One of the Strongest El Niños in 75 Years

GENEVA — THURSDAY, OCTOBER 8, 2026 — The world’s weather machine is shifting into a gear it hasn’t hit in three-quarters of a century. On Thursday, the World Meteorological Organization warned that a rapidly strengthening El Niño could become one of the strongest since at least 1950 — with a near-100% likelihood it persists through February 2027, pushing Pacific temperatures to record levels and raising the risk of drought, flooding and wider climate disruption around the globe.

“El Niño is firmly established and strengthening rapidly,” WMO Secretary-General Celeste Saulo said in the agency’s monthly Global Seasonal Climate Update. “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.” That near-certainty isn’t one model talking — it’s a consensus across 13 national and international centers, from Washington to Tokyo to London to Pune, built on ocean buoys, satellites and radiosonde data coordinated by the WMO, as the agency’s own bulletin explains.

02 The Numbers Behind the Warning

The figures are what turn a routine seasonal update into a headline. The Niño 3.4 index — the sea-surface temperature anomaly over the central-eastern equatorial Pacific, the number climatologists watch — jumped from +1.6°C above normal in June to +2.5°C in August, The Hindu BusinessLine reported. The WMO now forecasts the October–November–December seasonal average to peak at about +3.7°C around December — the highest since observations began, and well above the previous record of +2.6°C set from November 2015 to January 2016.

The US Climate Prediction Center’s own October 8 assessment found anomalies exceeding +4°C in parts of the eastern equatorial Pacific, with the Niño 3.4 index at +2.1°C in its latest observation, the Dainik Jagran English service reported. That’s why researchers are already calling this a “super El Niño” — a term reserved for the monsters of 1982–83, 1997–98 and 2015–16. The US center separately puts the odds of a strong-to-very-strong El Niño continuing into January–March 2027 at more than 83%.

03 What El Niño Actually Is

Strip away the jargon and El Niño is straightforward: it’s the warm phase of the El Niño–Southern Oscillation, a naturally occurring climate pattern that flips every two to seven years and typically lasts nine to twelve months, Reuters explained. Trade winds that normally push warm surface water west across the Pacific weaken; the warm water sloshes back east; and the atmosphere rearranges itself around it — shifting winds, pressure systems and rainfall patterns across the planet. The result: higher global temperatures, drought in some regions, drenching rains in others.

The “since 1950” benchmark matters because that’s roughly when reliable, standardized global ocean observations began — the WMO isn’t saying nothing bigger happened before, just that this could top everything in the modern observational record. And there’s a kicker, as Saulo said at the Global Heat Forum in Bangkok: “El Niño doesn’t add new heat to the planet. It releases heat the ocean has already been storing beneath the surface — which is why a strong event so often becomes one of the hottest years measured (as with 2024). The ocean it’s drawing from is the warmest we’ve ever measured it. There is simply more heat available to release.”

04 What This Could Mean for Winter

So what does a super El Niño actually do to your winter? The WMO’s bulletin is careful: it said the event will likely bring above-average temperatures to much of the globe and shift rainfall patterns, “increasing the risk of drought and floods in different regions.” The specific regional call in this month’s update: drier-than-average conditions are forecast over the Indian subcontinent, southern Central America, parts of the Caribbean and northwestern South America, per The Hindu BusinessLine.

Beyond that, the classic El Niño winter playbook is well documented from past events: the southern tier of the United States — California, the Gulf Coast, the Southeast — tends to run wetter while the northern tier runs warmer and drier, as the jet stream shifts south. But every El Niño writes its own version, and the WMO hasn’t pinned US-specific impacts in this bulletin — so treat the pattern as the starting forecast, not the finished one. One sobering data point from Reuters’ coverage: researchers at the University of Chicago’s Climate Impact Lab predicted last month that this year’s event could result in as many as 451,000 excess deaths worldwide from June through February 2027, driven by heat and its knock-on effects.

Context for the scale: mean global temperatures in August reached 16.96°C, tying July 2023 as the hottest month on record, according to the EU’s Copernicus Climate Change Service, Reuters reported. A super El Niño stacked on top of that baseline is the scenario climate scientists lose sleep over.

05 The Bigger Picture

El Niño will peak around December and then, eventually, fade — the 13-center consensus has it persisting through February 2027 at near-certainty. What comes after — a swing toward La Niña, a neutral pause — is the next forecast to watch. For now, the message from Geneva is blunt: the strongest El Niño of the modern era may be arriving at the exact moment the planet is hottest. Our news desk will keep tracking the seasonal updates as the December peak approaches — and if you want the storm-by-storm view, Hurricane Isaias is already giving the Atlantic a preview of what an energized season looks like.