Summary (tl;dr)

Forecasts indicate a high probability of a "super El Niño" developing in 2026, potentially becoming one of the strongest on record and prompting comparisons to the devastating 1877-1878 event due to its anticipated widespread impacts on global weather, including the United States.

Essential Background

El Niño is the warm phase of the El Niño-Southern Oscillation (ENSO), a natural climate pattern characterized by periodic variations in sea surface temperatures and winds across the tropical Pacific Ocean. These events typically occur every two to seven years, lasting approximately nine to twelve months, and significantly influence global weather conditions. A "super El Niño," or "very strong El Niño," is specifically defined by sea surface temperatures in the Niño3.4 region of the Pacific exceeding +2°C above the long-term average. Notable past super El Niño events include 1972-73, 1982-83, 1997-98, and 2015-16. Historically, the 1877-1878 El Niño stands out as one of the most intense on record, contributing to widespread famines and millions of deaths across several continents.

The Full Story

Current atmospheric and oceanic data, coupled with advanced forecast models from institutions like the European Centre for Medium-Range Weather Forecasts (ECMWF) and NOAA, suggest an increasing likelihood, up to a 100% chance by November, of a super El Niño forming in 2026. Projections indicate that central Pacific temperatures could exceed 3°C above average, potentially breaking records and even surpassing the intensity of the 1877 event. This developing phenomenon is being driven by a significant subsurface Kelvin wave, a pulse of warm water moving eastward beneath the Pacific surface. Scientists note that this event is unfolding against a backdrop of an already warming global climate, which could intensify its impacts. The trending comparisons to the 1877-1878 super El Niño highlight concerns about the potential for similarly extreme and devastating global weather patterns.

Why It Matters

A super El Niño is expected to bring significant disruptions to weather patterns across the United States and globally. For the summer of 2026, the central and western U.S. and western Canada could experience above-normal temperatures, while the southern U.S. and upper Midwest may see increased rainfall. Looking ahead to autumn and winter 2026-2027, forecasts suggest above-normal temperatures across the northern U.S. and western Canada, coupled with increased precipitation in the southern U.S. Specifically, regions from California through the Gulf Coast and into the Southeast are anticipated to experience wetter-than-average conditions, potentially leading to severe weather and flooding. Conversely, the northern U.S., including the Pacific Northwest, Northern Plains, and Great Lakes, typically faces warmer and drier conditions, with reduced snowfall. Globally, El Niño events are associated with heightened risks of droughts, floods, crop failures, and disruptions to food and water security. The combined effect of this potential super El Niño and ongoing climate change could make 2027 the warmest year on record. While modern predictive capabilities are vastly improved compared to 1877, concerns remain regarding the potential for widespread societal and economic impacts, particularly in vulnerable regions and interconnected global supply chains.

Geographic Location

• Central and Eastern tropical Pacific Ocean (where the Super El Niño is developing)
• Southern United States (increased rainfall, severe weather, flooding)
• Northern United States (warmer, drier conditions, reduced snowfall)
• Central and Western United States (above-normal temperatures)
• Upper Midwest, United States (increased rainfall)
• Colorado, United States (increased snowfall)
• India (historical famine due to 1877-1878 El Niño)
• China (historical famine due to 1877-1878 El Niño)
• Northeast Brazil (historical drought and famine due to 1877-1878 El Niño)
• Peru (increased rainfall, historical flooding)
• Ecuador (increased rainfall, historical flooding)
• Australia (drought risks)
• Indonesia (drought risks)
• Philippines (drought risks)
• Central America (drought risks)