What Is a Super El Niño? Why the World Is Bracing for Impact

What Is a Super El Niño?

To understand a super El Niño, it helps to start with El Niño itself. El Niño is the warm phase of a natural climate cycle in the tropical Pacific known as the El Niño-Southern Oscillation, or ENSO, and it returns roughly every two to seven years.

Under normal conditions, trade winds push warm surface water toward the western Pacific, keeping the ocean near Asia and Australia warmer than the waters off South America. During El Niño, those winds weaken and the pattern flips, leaving unusually warm water stretched across the central and eastern Pacific. That shift changes where storms form, how the jet stream flows and where rain falls around the world.

A super El Niño, which NOAA officially calls a "very strong" El Niño, is one where ocean temperatures in the central and eastern tropical Pacific climb at least 2°C (3.6°F) above average. For comparison, a rise of just 0.5°C is enough to count as an El Niño in the first place.

Super El Niños are rare. The best-known examples arrived in 1982-83, 1997-98 and 2015-16, and the 1997-98 event in particular is still remembered for droughts, floods and other disasters across the globe.

Because the extra ocean heat is so large, a super El Niño pushes the usual effects further. It tends to bring heavier rain to parts of South America, the southern United States and East Africa, while driving deeper drought and extreme heat into Australia, Indonesia, the Philippines, India and southern Africa. It can also push global temperatures higher.

Why the 2026 Super El Niño Could Be the Strongest on Record

NOAA officially declared El Niño on June 11, 2026, and it has been gaining strength ever since. In its October 8 update, NOAA's Climate Prediction Center gave an 83% chance that the October to December period will reach at least 2.5°C above average on the RONI scale, which would surpass every El Niño on record going back to 1950.

The World Meteorological Organization expects Pacific surface temperatures could reach 3.8°C above average between November and January. The UN is treating it as a global threat. Relief chief Tom Fletcher called El Niño a "wrecking ball" for Latin America, eastern and southern Africa, Asia and the Pacific. The UN estimates around 50 million people could face greater hunger as a result, and UNICEF warns that more than 162 million children in eastern and southern Africa are exposed to drought and flooding risks.

Countries Declaring Emergencies

Bolivia became the latest to respond on Saturday, October 31, when President Rodrigo Paz signed a national emergency decree to free up funding and send more rescue teams to the hardest-hit areas. Drought has already affected 78,000 families across six of the country's nine regions and killed more than 75,000 head of cattle.

Peru has issued a series of emergency decrees since July, the broadest covering 893 districts in 22 regions ahead of the rainy season. Heat and wildfires there have already killed at least 12 people.

Ecuador declared an emergency in late August and has since added the Galápagos Islands, where heavy rain flooded homes, cut water service in Puerto Ayora, and forced a temporary halt to commercial flights so aid could get through.

Indonesia and the Philippines are on alert across the Pacific. Indonesia has declared drought emergencies in several districts, and the Philippines has been under a formal El Niño advisory since June.

East and southern Africa are also in the UN's sights. Somalia, Ethiopia and Kenya need supplies in place before heavy rains arrive, while southern Africa needs seeds and livestock support to get through the expected drought.

How the U.S. Is Preparing

California has taken the biggest step so far. Governor Gavin Newsom proclaimed a statewide emergency on September 21, directing agencies to stage flood equipment, put the National Guard on standby, and speed up permits for flood protection projects.

Some effects have already reached the coast. Huntington Beach declared an emergency last week after record tides flooded low-lying areas, and the National Weather Service reported that sea levels near San Diego were about 17 inches higher than a year earlier, partly due to the unusually warm Pacific water.

For the rest of the country, NOAA's winter outlook, released October 15, lays out what to expect from December through February:

• Wetter than average conditions across the southern U.S., from California to Florida, and along the East Coast
• Warmer than average temperatures across the northern U.S., including the Pacific Northwest, Midwest, and Alaska
• Easing drought in the Southwest, Southern Plains and parts of the East
• Drier conditions in parts of the northern Rockies and Great Lakes

When Is El Niño Expected to End?

The current super El Niño should peak around December and then slowly weaken, but it likely won't be gone until spring 2027.

NOAA expects El Niño conditions to last through March to May 2027, with the Pacific most likely returning to neutral between April and June. A switch to La Niña, El Niño's cooler counterpart, looks unlikely before summer, with NOAA giving it just a 13% chance by May to July.

Its effects will outlast it, though. The biggest U.S. impacts usually arrive between December and March, and the Philippines faces drought that could run into May 2027. NOAA's next official update is due November 12.

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