The return of El Niño in 2026: A record-breaking global heatwave is predicted
The World Meteorological Organization (WMO) has issued a warning about the potential return of the El Niño climate phenomenon between May and July 2026, accompanied by a rapid rise in tropical Pacific Ocean surface temperatures. Global climate models indicate that this return could lead to widespread impacts, most notably record-breaking global temperatures and drastic changes in rainfall and drought patterns worldwide.
What is the El Niño phenomenon? Its scientific and historical context
El Niño is a natural climate pattern that occurs periodically every two to seven years, characterized by a rise in surface water temperatures in the eastern and central tropical Pacific Ocean. This phenomenon is part of a broader climate oscillation known as the Southern Oscillation (ENSO), which alternates between three phases: El Niño (warm phase), La Niña (cool phase), and a temperate phase. Historically, fishermen in Peru and Ecuador have observed this phenomenon for centuries, noting an unusually warm flow of water off their coasts during the Christmas season. They named it El Niño, which means "little child" or "Christ Child" in Spanish.
Expected impacts at the regional and international levels
The effects of El Niño extend far beyond the Pacific Ocean, impacting climates worldwide. Its return is expected to exacerbate heat waves and droughts in regions such as Australia, Indonesia, and parts of South Asia, increasing the risk of wildfires and threatening food security. Conversely, other areas, such as the southern United States, the Horn of Africa, and parts of South America, may experience torrential rains and devastating floods. The convergence of this natural phenomenon with ongoing global warming caused by human activity is a cause for concern among scientists, as it could push average global temperatures to unprecedented levels.
The importance of preparedness and early warning
The World Meteorological Organization (WMO) has emphasized the critical importance of accurate seasonal forecasts in supporting preparedness efforts. These forecasts are vital for critical sectors such as agriculture, water resource management, energy, and public health. Early warnings enable governments and organizations to take proactive measures, such as stockpiling food supplies, managing dams and reservoirs, and preparing health systems to deal with heat- or flood-related illnesses. The WMO indicated that it will issue further updates in May to enhance the accuracy of its projections and assist decision-makers in developing effective response plans to mitigate the potential adverse impacts of El Niño's return.
