A rapidly strengthening El Niño is barreling toward its peak this winter, and forecasters say it could rival — or even surpass — the historic events of 1997-98 and 2015-16. According to the latest NOAA Climate Prediction Center update, El Niño conditions are already observed in the tropical Pacific, not merely forecast, and are expected to persist through Northern Hemisphere spring 2027. The odds keep climbing too: a very strong “Super” El Niño is now the most likely outcome for the 2026-2027 winter, with NOAA’s Climate Prediction Center putting the probability above 90% for fall and winter, up sharply from just 63% in June and 81% in July. Even more striking, forecasters give the October–December 2026 season a 69% chance of producing a historic event — a three-month index reading that would exceed every El Niño on record dating back to 1950.
What’s Driving the Surge
The numbers behind this event are dramatic. The traditional Niño 3.4 index, the benchmark scientists use to track the phenomenon, has shown a clear and sustained increase, with the seasonal mean reaching roughly +1.5°C during May–July 2026 and the July monthly value climbing past +2°C. By mid-August, the latest weekly reading had pushed even higher, to around +2.7°C — a pace that has forecasters describing this as one of the most rapidly intensifying El Niño events in the modern record. Ocean heat content in the tropical Pacific has also exceeded levels not recorded since the legendary 1997-98 super El Niño, underscoring just how much warm water is currently fueling the system.
The event’s origins trace back to earlier in the year, when downwelling Kelvin waves pushed warm subsurface water toward the surface of the central Pacific. By May 2026, weekly readings had crossed the key +0.5°C warming threshold and kept climbing. The following month, with the ocean clearly warm and the atmosphere visibly responding — trade winds slackening, rainfall patterns shifting eastward, and the Southern Oscillation Index turning negative — NOAA made it official, upgrading its ENSO alert from a Watch to a full Advisory.
A Record-Warm Planet
The warming ocean is already reshaping the broader global climate picture. The developing El Niño is boosting expectations for global temperatures both this year and next, and one closely watched projection now estimates that 2026 will finish around 1.51°C above pre-industrial levels — enough to make it the second-warmest year in the historical record, trailing only 2024. Notably, the first six months of 2026 were already the third-warmest start to any year on record, and the odds of 2026 setting an outright global temperature record have nearly doubled in just four months, almost entirely because of the strengthening El Niño. Tropical Atlantic sea surface temperatures are also expected to stay warmer than average, compounding the overall warmth building across the planet’s oceans.
Who Will Feel It Most
On the ground, the effects are expected to be far-reaching and uneven across the globe. Forecasters note that wetter-than-normal conditions are expected across the Greater Horn of Africa, parts of Central Asia, Southern Europe, western North America south of 45°N, and southeastern South America, while an overwhelming majority of land areas worldwide are expected to see above-average temperatures — with the strongest signals stretching across Africa, southern Europe, the Arabian Peninsula, the Indian subcontinent, eastern Asia, Central America, the Caribbean, southern Africa, much of South America, and New Zealand. One WMO official summed up the shift bluntly, describing El Niño as no longer just approaching but already firmly established and actively intensifying global heat.
For regions prone to El Niño-driven drought, including parts of Southeast Asia, Australia, and southern Africa, agricultural and water-resource planners are watching closely, since past strong events have triggered significant crop losses and water shortages in these areas. Meanwhile, regions expecting heavier rainfall face their own risks, from flooding to landslides, particularly in areas where infrastructure isn’t built to handle sudden, intense precipitation.
How This Compares to Past Events
El Niño is the warm phase of a recurring climate pattern in the tropical Pacific, and it’s formally declared when the three-month running average sea surface temperature in the Niño-3.4 region reaches or exceeds +0.5°C for a sustained period. Only three events since 1950 have reached “very strong” status by this measure: 1982-83, 1997-98, and 2015-16, each of which produced a peak of at least +2.0°C and left a lasting mark on global weather, agriculture, and disaster response. As of the most recent outlooks, this year’s event is tracking in a similar range to where those historic episodes stood at the same point in their development — which is precisely why scientists are watching so closely heading into fall.
What Comes Next
Model consensus currently favors the event peaking somewhere between the September–November and November–January seasons, following the classic seasonal calendar El Niño events tend to follow. History suggests these episodes typically weaken through the following spring, and current forecasts do point toward a gradual decline by spring 2027 — though forecasters caution that predictions beyond the peak still carry real uncertainty, and outlooks will continue to be updated monthly as new data comes in. For now, the message from climate agencies is clear: this El Niño is strengthening fast, its impacts are already being felt around the world, and communities everywhere should use the coming months to prepare for the disruptive weather it’s expected to bring.