May 2025 Quick Look

As of mid-May 2025, the equatorial Pacific is in an ENSO-neutral state, with sea surface temperatures in the Niño 3.4 region that are close to average (-0.10°C for April 2025). The IRI ENSO plume forecast indicates a high probability (92%) of ENSO-neutral conditions for May to July 2025. These neutral conditions are expected to continue through August to October 2025, with probabilities remaining above 50%. For later forecast seasons (until Jan–Mar 2026), ENSO-neutral conditions remain the most likely outcome, though probabilities decrease to the 40% range. During the forecast period, neither El Niño nor La Niña shows a strong preference, though La Niña have slightly higher chances as compared to El Nino.