The United Nations’ World Meteorological Organization (WMO) has warned that the ongoing El Niño event is expected to strengthen rapidly between July and September 2026. The agency said the phenomenon, which has already begun, could reach the “strong” category—the third-highest level in its classification system. WMO urged countries to prepare for potential impacts, including increased risks of extreme weather events across many regions.

El Niño is a natural climate pattern marked by rising sea surface temperatures in the central and eastern equatorial Pacific Ocean, disrupting global wind, pressure, and rainfall patterns. The WMO’s Global Seasonal Climate Update indicated that sea surface temperature anomalies could exceed 2°C in key monitoring areas. The organization noted high confidence in forecasts showing continued warming, with effects expected to intensify through the Northern Hemisphere’s autumn.

WMO Secretary-General Celeste Saulo said the strengthening El Niño could heighten risks of droughts, heavy rainfall, and heatwaves on land and at sea. The agency is expanding early warning support, particularly for climate-sensitive sectors such as agriculture and health, to help reduce impacts on lives and economies.