The last time a truly powerful El Niño collided with a planet already running a fever, the results were staggering. In 2016, global temperatures spiked to levels never recorded in the modern era, coral reefs across the tropics bleached on a mass scale, and drought gripped Southeast Asia so severely that Indonesia declared a national disaster. Now, federal forecasting systems are warning that 2026 could surpass even that benchmark. Multiple independent prediction models assign greater than 80 percent probability to El Niño conditions dominating the tropical Pacific from September through November, and the event is expected to strengthen into the range scientists classify as “super,” meaning sea-surface temperature anomalies in the central Pacific exceed 2.0°C above the long-term average.
If those projections hold, the El Niño’s peak warmth will layer on top of a climate baseline that has already shattered records in back-to-back years. NASA, NOAA, and the European Union’s Copernicus Climate Change Service all confirmed that 2024 was the hottest year in their respective records, and early 2025 data showed little relief. The combination of persistent greenhouse gas warming and a strong natural warming cycle creates conditions that climate researchers say have no close analog in the observational record.
What forecasters are seeing
The clearest signal is coming from NOAA’s Geophysical Fluid Dynamics Laboratory, which operates an experimental seasonal prediction system called SPEAR. In its spring 2026 forecast cycle, SPEAR identified what the lab described as an “unusually high likelihood of a moderate-to-strong El Niño by fall 2026,” based on large ensembles of coupled ocean-atmosphere simulations run on GFDL computing infrastructure. Those simulations track evolving Pacific sea-surface temperatures and their cascading effects on atmospheric circulation worldwide. The modeled timeline places the peak heat contribution squarely in the October-to-December corridor, when the tropical Pacific typically reaches its highest temperature anomalies during strong events.
NOAA’s Climate Prediction Center, the agency’s operational forecasting arm, reinforces that picture. Its official ENSO probability tables, updated monthly and republished through the agency’s drought early warning system, place El Niño likelihood above 80 percent for both the September-through-November and October-through-December windows. That figure reflects agreement across both statistical and dynamical forecast models, a convergence that forecasters say is uncommon this far ahead of the fall season. The tables show only a slim chance that neutral conditions will persist into late 2026 and an even smaller probability of a flip back to La Niña.
A third independent check comes from the International Research Institute for Climate and Society at Columbia University, whose ENSO probabilistic forecast extends category-by-category outlooks through early 2027. The IRI results broadly match the CPC and SPEAR projections, which matters because the three systems use different model architectures and initialization methods. When they converge this strongly, the signal is not a quirk of one model’s assumptions; it reflects something physically robust happening in the Pacific Ocean.
On the measurement side, NASA’s Goddard Institute for Space Studies maintains GISTEMP v4, the global surface temperature dataset that serves as one of the primary scorecards for tracking warming. GISTEMP’s monthly anomaly updates through early 2026 already show the planet running well above the 1951-1980 baseline, and the arrival of a strong El Niño would push those numbers higher still. The dataset, along with counterparts from NOAA and Copernicus, will provide the definitive answer on whether 2026 claims the record once full-year data are compiled.
Why “super” matters
Not all El Niño events are created equal. Moderate episodes nudge global temperatures upward by a fraction of a degree and shift rainfall patterns in predictable but manageable ways. Super El Niños, the kind that occurred in 1997-98 and 2015-16, operate on a different scale. During the 1997-98 event, the Niño 3.4 index, the standard measure of central Pacific warming, peaked above 2.5°C. Flooding killed hundreds in Peru and Ecuador, wildfires burned through drought-stricken Borneo, and global commodity markets lurched as crop yields dropped across multiple continents.
The 2015-16 super El Niño was comparable in Pacific intensity but arrived on a warmer planet, which amplified its global temperature signature. That event pushed 2016 to the top of every major temperature record at the time. Current model guidance suggests the 2026 event could reach a similar magnitude, though the exact peak intensity remains uncertain. What is different this time is the starting point: the planet in 2026 is roughly 0.2°C warmer than it was in 2015, thanks to continued accumulation of carbon dioxide and other greenhouse gases. That higher baseline means even a moderately strong El Niño could produce record global temperatures, and a genuinely super event would push the thermometer into territory with no modern precedent.
What remains uncertain
Confidence is high, but it is not certainty. Both the IRI and CPC analyses flag the spring predictability barrier, a well-documented period from March through May when ENSO forecasts lose accuracy because the tropical Pacific is transitioning between states. Predictions issued during this window have historically carried wider error margins than those made in summer or fall. The current model agreement is strong enough to overcome much of that concern, but the barrier means the exact magnitude of the event, specifically whether it crosses the super threshold or settles into the strong-but-not-exceptional category, is not yet locked in.
Regional outcomes carry even more uncertainty than the global signal. Strong El Niño events tend to bring wetter conditions to the southern United States and parts of South America while drying out Indonesia, northern Australia, and portions of the Amazon basin. But those patterns are statistical tendencies, not guarantees. The precise placement of rainfall and drought anomalies shifts from event to event depending on ocean temperatures in the Atlantic and Indian basins, land-surface conditions, and the inherent randomness of weather. Farmers in Queensland and ranchers in Texas will both be watching the forecasts, but neither can know exactly how the pattern will land on their property.
There is also the question of compounding factors. Solar Cycle 25 is near or just past its expected maximum, which some researchers have suggested could amplify regional heat extremes when it overlaps with a strong El Niño. However, operational outlooks from NOAA and partner agencies treat solar variability as a relatively modest influence compared with greenhouse gas forcing and ENSO state. Its contribution to 2026 temperatures, if any, is likely small and difficult to isolate from the much larger El Niño and anthropogenic signals.
Finally, the forecast horizon has limits. Current CPC and GFDL products provide probabilistic guidance through early winter 2026-27 but offer little detail on how quickly the event might decay or whether a sharp transition to La Niña could follow. Past super El Niños have sometimes given way to strong La Niña episodes within months, which would bring an entirely different set of regional hazards, including heightened Atlantic hurricane activity and renewed drought in the U.S. Southwest.
What is at stake before November
For the people whose livelihoods and safety depend on seasonal climate patterns, the distinction between a projection and a confirmed record is largely academic. Agricultural planners, water managers, and public health officials routinely act on forecasts with this level of confidence because waiting for observational proof means losing months of preparation time.
With El Niño probability above 80 percent for the fall, the signal is already strong enough to trigger concrete responses. NOAA’s drought early warning system is designed to translate exactly this kind of forecast into regional advisories. Crop planting schedules in the U.S. Southern Plains and parts of South America may need adjustment. Wildfire agencies in Australia and Southeast Asia are reviewing resource positioning for what could be an unusually severe dry season. And urban heat-health programs in cities from Phoenix to New Delhi face the prospect of summer and fall temperatures compounding on an already elevated baseline.
The science does not guarantee that 2026 will be the hottest year ever recorded. That determination will come only after GISTEMP and its counterparts compile the full year’s data, likely in January 2027. But the convergence of forecasts from NOAA, Columbia’s IRI, and NASA’s measurement infrastructure points to a narrow range of outcomes, nearly all of them historically extreme. The Pacific is warming. The planet’s background temperature is already at record levels. And the window for preparation is closing faster than the window for certainty will open.
More from Morning Overview
*This article was researched with the help of AI, with human editors creating the final content.
