Weather West: Rising Odds of Strong-to-Historic El Niño Event in 2026, Growing Likelihood of Significant Regional-to-Global Impacts

Climate scientists are warning of a high likelihood of a strong-to-historic El Niño event in late 2026, following the Spring Predictability Barrier. Multi-model ensemble predictions now indicate a median forecast of at least a strong El Niño, with many models suggesting a top-tier event that could rival historical records. This shift is driven by weakened or reversed easterly trade winds in the equatorial Pacific, allowing warm water to surge eastward and suppress cool upwelling off Peru. The event could trigger global weather disruptions, including altered rainfall patterns, increased droughts and wildfires in some regions, and heightened flood risks in others. El Niño also acts as a temporary global thermostat, releasing stored heat from the Pacific Ocean into the atmosphere, raising global temperatures by 0.2°C–0.4°C. This warming effect compounds existing human-caused climate change, which has already raised baseline temperatures by 1.4°C–1.5°C. The forecast is based on international climate models, including the newly released multi-model ‘superensemble’ predictions for June 2026. Both traditional and newer ‘relative’ El Niño indices (RONI) suggest the potential for unprecedented intensity. Scientists emphasize that the event’s impacts will be felt worldwide, affecting agriculture, water supplies, and ecosystems. El Niño’s effects extend beyond weather, influencing global jet stream patterns through Rossby waves and temporarily intensifying tropical storm activity. The event’s timing in the late 2020s could exacerbate existing climate vulnerabilities, including droughts in Australia and Southeast Asia, floods in South America, and disruptions to marine ecosystems. Preparations are already underway in vulnerable regions, though the exact magnitude remains uncertain. The forecast underscores the need for global resilience planning as climate variability intensifies.