**Current observations and model consensus strongly support elevated odds for a record 2026–27 El Niño.** Weekly Niño 3.4 sea-surface temperature anomalies reached +3.1 °C by late September 2026—the highest in the post-1981 record—and daily values have already surpassed the 2015–16 peak. An exceptionally large subsurface heat reservoir (anomalies exceeding +8–10 °C at depth) continues to fuel surface warming, with all 22 dynamical and statistical models projecting further intensification to a peak of roughly +3.5–4.1 °C during October–December or November–January. NOAA assigns >90 % probability of a “very strong” event (Niño 3.4 ≥ +2.0 °C) and 75 % odds of a historic peak exceeding prior events on the relative Oceanic Niño Index (RONI) since 1950. While forecast plumes contain realistic uncertainty and index definitions differ, the overwhelming majority of ensemble members exceed every historical benchmark.
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