Climate Alert Bulletin No. 426, prepared by the Regional Scientific Committee for the Study of the El Niño Phenomenon (ERFEN), presents an analysis of the oceanographic and atmospheric conditions of the tropical, equatorial, and regional Pacific for March 2026, including variables such as sea surface temperature, precipitation, winds, salinity, and sea level. The document also includes results from numerical climate forecasting models and climate outlooks for Colombia, Ecuador, Peru, and Chile. Its objective is to alert authorities and the public about the evolution of the El Niño phenomenon and its potential impacts on the South Pacific region.