Forecasters Warn of a Possible Super El Nino in 2026, With Half of European Models Projecting Record-Breaking Intensity
Climate models increasingly project a super El Nino emerging by late summer 2026, with roughly half of ECMWF ensemble members forecasting sea surface temperature anomalies exceeding 2.5 degrees Celsius, which could make it the strongest event in recorded history.
Overview
Climate forecasters are tracking what could become the most powerful El Nino event in modern history. Multiple modeling systems now project that a super El Nino, defined by sea surface temperature anomalies exceeding 2.0 degrees Celsius above the long-term average in the central and eastern equatorial Pacific, will develop by late summer or early fall 2026 and persist through the following winter. If the more aggressive model runs prove accurate, the event could push global temperatures to unprecedented highs in 2026 or 2027 and redraw weather patterns across every inhabited continent.
What We Know
The Models Are Converging
The European Centre for Medium-Range Weather Forecasts, widely regarded as the most skillful seasonal prediction system, shows all 20-plus ensemble members predicting moderate to strong El Nino conditions by mid-June 2026, according to Time. Roughly half of those members project anomalies surpassing the 2.5-degree Celsius threshold by October, a level reached only once before, during the 2015-16 event. The North American Multi-Model Ensemble corroborates this trajectory, with nearly all of its members from March forecasts showing El Nino development by June and several pushing anomalies past 2.0 degrees Celsius by autumn.
NOAA has placed the probability of El Nino emerging between June and August at 62 percent, with a one-in-three chance it will reach strong intensity by the October-December window, according to Live Science. AccuWeather estimates a 15 percent probability of a full super El Nino by November.
The Ocean Is Already Primed
Subsurface conditions are unusually favorable for rapid intensification. Water temperatures in the top 300 meters below the equatorial Pacific were at or above average as of late March, with only thin surface cool-water layers remaining from the fading La Nina, CNN reported. Three tropical cyclones flanking the equator simultaneously, a rare configuration, have amplified westerly wind bursts that push warm water eastward, a key mechanism for El Nino development.
Paul Roundy, a climate scientist at the University at Albany, told Time there is “real potential for the strongest El Nino event in 140 years,” noting that current westerly wind anomalies exceed those observed during spring 1997, which preceded the powerful 1997-98 super event.
Historical Context
Since 1950, only five El Nino events have reached the super threshold of 2.0 degrees Celsius: 1972-73, 1982-83, 1997-98, 2015-16, and 2023-24. Of these, only the 2015-16 event pushed past 2.5 degrees Celsius. The economic toll has been severe; research published in 2023 estimated that the 1982-83 and 1997-98 events each cost between 4.1 and 5.7 trillion dollars globally.
What We Don’t Know
The Spring Predictability Barrier
Forecasters caution that spring is the season of lowest ENSO prediction skill. The so-called “spring predictability barrier” means that ocean-atmosphere coupling has not yet locked in, and model confidence typically does not solidify until late May or June. The worst March ENSO forecast in 33 years of records occurred in 2017, when models projected El Nino but unexpected La Nina conditions developed instead, as Time reported.
NOAA meteorologist Nat Johnson has noted that while forecasts provide “an early heads up on changing risks,” intensity remains “very uncertain,” as CNN reported. A technical caveat further complicates the picture: some ECMWF forecast values may be slightly inflated because they use a 1981-2010 baseline rather than the warmer 1991-2020 reference period, potentially overstating strength by roughly 0.5 degrees Celsius.
Climate Change Complicates the Calculus
Global and western Pacific sea surface temperatures were warmer in early 2026 than in early 2023, the year that preceded the most recent strong El Nino. Rising greenhouse gas forcing complicates how El Nino amplitude is measured and its impacts experienced. A Nature Communications study found that super El Nino events drive climate regime shifts with enhanced risks under global warming, meaning that even a moderately strong event in today’s warmer baseline climate could produce impacts comparable to the super events of decades past.
Analysis
What a Super El Nino Would Mean
If the stronger projections verify, the consequences would be sweeping. A super El Nino continuing through winter would “nearly guarantee that 2026, 2027, or both will set records as the warmest year since 19th-century instrumental data began,” according to CNN. Live Science reported that 2027 becomes “very likely to be the warmest year on record” due to the historical lag between ENSO and surface temperatures.
Regional impacts would be far-reaching. The Atlantic hurricane season faces significant suppression due to increased wind shear, while the Pacific would see strengthened tropical cyclone activity. The United States could experience cooler-than-normal summers across the northern and central states, followed by a winter of amplified storms across the southern tier and California, according to The Washington Post. Globally, drought conditions would likely intensify across Australia, the Amazon basin, India, and central and southern Africa, while southeastern South America and the Horn of Africa face elevated flood risk.
The Narrowing Window for Preparation
The convergence of model signals, while not yet definitive, is strong enough that governments, agricultural planners, and disaster preparedness agencies have a narrowing window to act. Previous super El Nino events triggered cascading effects across food systems, water resources, and public health that lasted years after the ocean temperatures normalized. With the next round of model updates expected in late May, the coming weeks will determine whether forecasters upgrade their outlooks further or whether the spring predictability barrier claims another premature consensus.