Super El Niño 2026 Forecast: Will California Finally Get Soaked?

On May 14, 2026, the National Weather Service's Climate Prediction Center raised the chance of El Niño emerging within a few months to 82 percent, up from 61 percent a month earlier, and put the odds of a very strong event by year-end at 37 percent.

A Forecast Shifting Faster Than Forecasters Expected

The Climate Prediction Center's latest outlook is the steepest single-month jump in El Niño odds in recent memory. Beyond the headline 82 percent emergence figure, the agency now puts the probability of El Niño being present during the coming Northern Hemisphere winter at 96 percent. The same May 14 outlook breaks the year-end intensity probabilities down further: 37 percent for very strong, 30 percent for strong, 22 percent for moderate, and only 9 percent for weak. A month earlier, the very strong probability had been 25 percent. In other words, the most extreme outcome on the table has become the single most likely one.

"The tropics are changing quickly, and there is increasing confidence that a transition will occur within the next couple of months," NOAA meteorologist Nathaniel Johnson said this month. The note of urgency is unusual for an agency that typically hedges. NOAA's confidence reflects what it can actually observe today: warming subsurface water in the central and eastern equatorial Pacific, a weakening of trade winds, and westerly wind bursts along the equator in April 2026 that already exceed the conditions observed in spring 1997, the lead-up to the historic 1997-98 super El Niño.

The crucial caveat, which the Climate Prediction Center is careful to make, is that statistical confidence about the ocean is not the same as confidence about the weather. The 82 percent figure describes the temperature of the Pacific. It does not describe what storms will eventually reach the California coast.

The +2.0 Degree Threshold and What the Models Are Saying

To classify how big an El Niño actually is, forecasters watch a stretch of equatorial ocean known as the Niño 3.4 region. The official threshold for a "super" or very strong El Niño is a Niño 3.4 sea-surface-temperature anomaly of at least +2.0 degrees Celsius above the seasonal average. Since 1950, only five events have crossed that line: 1972-73, 1982-83, 1997-98, 2015-16 and 2023-24. Of those five, only the 2015-16 event managed to exceed +2.5 degrees Celsius.

The April 2026 ECMWF model ensemble has put forecasters on notice. One hundred percent of its 20-plus members predict at least a moderate El Niño in place by mid-June 2026. Roughly 50 percent of the same ensemble members project the Niño 3.4 anomaly to exceed +2.5 degrees Celsius by October 2026. A March 2026 forecast from the North American Multi-Model Ensemble told a similar story, with nearly all members predicting El Niño conditions by June and a few pushing anomalies past +2.0 degrees by October.

Looking at the equatorial Pacific in April, Paul Roundy, an ENSO expert at the University at Albany, said the conditions were unusual enough to warrant a historic comparison. "There is real potential for the strongest El Niño event in 140 years," he said. That framing is consistent with the spread the ECMWF ensemble is now showing. The headline question for California is whether half of those model runs are right, and whether the atmosphere will translate that ocean heat into storm tracks aimed at the southern half of the state.

What Past Super El Niños Did to California

The state has a thick file on what a super El Niño can deliver, and the record is not consistent. The 1997-98 event remains the modern benchmark. It killed 17 people in California and caused more than 500 million dollars in damage. During that winter, the subtropical jet stream shift was so intense that downtown Los Angeles received nearly a full year of average rainfall in a single month. In early 1998, El Niño-fueled storms destroyed 27 oceanfront homes and damaged roughly 3,000 houses and 900 businesses across the state.

The 1982-83 super event preceded it with a similar coastal story. That winter caused roughly 100 million dollars in coastal damage in California, destroying 33 oceanfront homes and damaging another 3,000. A 2023 economic analysis put the long-term global cost of those two super events combined at between 4.1 and 5.7 trillion dollars.

Then came the anomaly. The 2015-16 super El Niño produced record warmth in the equatorial Pacific, yet Southern California received below-average rainfall and the state's five-year drought continued. The event still produced record coastal erosion along the California coast, but the parade of inland storms that forecasters had warned about never quite materialized. The 2023-24 winter, classed as a strong event rather than super, swung the other way. Downtown Los Angeles recorded 155 percent of its average annual rainfall, and five consecutive rainy days in February 2024 triggered hundreds of mudslides across Los Angeles County, with 15 homes red-tagged from debris flows.

Two super events delivered catastrophic flooding. One delivered almost nothing. A strong event, on a smaller scale than super, still red-tagged homes. The historical baseline gives a clear range of risk, but no schedule.

The Atmospheric River Wildcard

The reason the Pacific can be loaded with heat while California stays dry, or vice versa, sits in a layer of the forecast that is much harder to predict than the Niño 3.4 anomaly itself. California's total winter rainfall depends heavily on the number and strength of atmospheric rivers, the narrow plumes of moisture that funnel storms into the West Coast. A typical El Niño shifts the subtropical jet stream northward, pulling storm tracks toward California and the southern United States. But whether those tracks line up with productive atmospheric rivers, and how many of them arrive in a single winter, is largely a matter of week-to-week atmospheric chaos.

There is also a localized wildcard for the 2026-27 setup. A marine heat wave that started off California in May 2025 was expected to fade between October and December 2025, but unexpectedly persisted off Southern California through spring 2026 and is now re-expanding off the coast. That patch of unusually warm coastal water adds another variable on top of an already unusual equatorial picture. Globally, El Niño typically brings wetter conditions to southern South America, central Asia and the Horn of Africa, and drier conditions to Washington, Oregon, Idaho, Alaska, the Ohio River Valley, Australia, Indonesia and southern Asia. None of those regional expectations carry guarantees this time.

A Baseline No Super El Niño Has Started From Before

What makes the 2026-27 forecast genuinely without precedent is not just the ocean. Global mean warming has reached roughly 1.5 degrees Celsius above pre-industrial levels as of 2026, the warmest baseline that any super El Niño has ever started from. Arctic winter sea-ice extent set a new record low during the 2025-26 cold season, and global wildfires had already burned more than 150 million hectares as of mid-May 2026.

"In modern human history, we've never experienced a strong or very strong El Niño event amid pre-existing conditions that were this warm globally," Daniel Swain, a climate scientist at UCLA and the California Institute for Water Resources, said of the setup. Zachary Labe, a climate scientist with Climate Central, framed it more bluntly: "This is shaping up to be a very rare and unusual El Niño event this year."

Because the baseline is so far outside the historical record, every analog from 1997-98, 1982-83 and 2015-16 carries less predictive weight than it normally would. The ocean's energy is loaded, the model agreement is rare, and the global thermal state has shifted under the entire forecast. The next six months will decide whether that alignment produces epic rain on the California coast or another historic miss.

Sources

• Los Angeles Times via AOL: This coming El Niño could be a monster
• Yale Climate Connections: A powerhouse El Niño event appears to be brewing for 2026-27
• Eos: 2026 Has Already Broken Climate Records. El Niño Could Break More.
• CNN: El Niño is coming faster than expected and chances are rising it will be historically strong
• NOAA Climate Prediction Center: ENSO Diagnostic Discussion