La Niña continued in January 2026, with below-average sea surface temperatures (SSTs) observed in the east-central equatorial Pacific Ocean [Fig. 1]. The latest weekly Niño-3.4 index value was -0.9°C, with the westernmost (Niño-4) and easternmost (Niño-1+2) indices at -0.4°C and 0.0°C, respectively [Fig. 2]. The equatorial subsurface temperature index (average from 180°-100°W) significantly increased [Fig. 3], reflecting the strengthening and expansion of above-average subsurface temperatures across the Pacific Ocean [Fig. 4]. Atmospheric anomalies weakened due to subseasonal variability, but still reflected aspects of La Niña. Low-level westerly wind anomalies were present over the western equatorial Pacific, and upper-level westerly wind anomalies continued across the east-central equatorial Pacific. Suppressed convection was weakly evident near the Date Line and over the equatorial Maritime Continent, with enhanced convection located off the equator [Fig. 5]. The traditional and equatorial Southern Oscillation indices were positive. Collectively, the coupled ocean-atmosphere system remained consistent with La Niña.

The North American Multi-Model Ensemble (NMME) average, including the NCEP CFSv2 [Fig. 6], favor the onset of ENSO-neutral in February-April 2026. The team consensus also reflects this outcome, with ENSO-neutral persisting through the Northern Hemisphere summer 2026. For the late summer and beyond, there is a 50-60% chance of El Niño forming, though model uncertainty remains considerable and forecasts made this time of year tend to have lower accuracy. In summary, a transition from La Niña to ENSO-neutral is expected in February-April 2026 (60% chance), with ENSO-neutral likely persisting through the Northern Hemisphere summer (56% chance in June-August 2026; [Fig. 7]).

This discussion is a consolidated effort of the National Oceanic and Atmospheric Administration (NOAA), NOAA's National Weather Service, and their funded institutions. Oceanic and atmospheric conditions are updated weekly on the Climate Prediction Center web site (El Niño/La Niña Current Conditions and Expert Discussions). A probabilistic strength forecast is available here. The next ENSO Diagnostics Discussion is scheduled for 12 March 2026.

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