Will La Niña Follow El Niño 2026?
It's too early for a definitive forecast, but the historical odds lean toward it. Strong El Niño events are frequently followed by a La Niña the following year — the warm phase dumps heat out of the tropical Pacific, the ocean overshoots cold, and the cycle flips. The 2026 event is forecast to peak at Super El Niño strength (NOAA gives a 63% chance), and if it does, a 2027 La Niña becomes the base-case expectation rather than a coin flip.
What we can say now: the Oceanic Niño Index sits at +1.39°C (May-July 2026), the event is still strengthening, and its peak is most likely in the November-January window. Whether a La Niña develops in 2027 — and how strong it gets — depends on how fast the warm water discharges after that peak.
What History Shows
| El Niño | Peak ONI | Following Year | What Followed |
|---|---|---|---|
| 1997-98 | +2.3 | 1998-99 | Strong La Niña (ONI −1.6) |
| 2015-16 | +2.6 | 2016-17 | Weak La Niña (ONI −0.8) |
| 2023-24 | +2.0 | 2024-25 | La Niña conditions |
| 2026 (current) | +1.39 (so far) | 2027 | To be determined |
The pattern is consistent but not universal. Every Super El Niño of the modern era was followed by at least weak La Niña conditions. The one caveat: the 2026 event follows an unusually short gap after the previous La Niña (the shortest since 1963), and back-to-back rapid flips can behave differently. Still, "El Niño then La Niña" is the base case, not the tail risk.
What a 2027 La Niña Would Mean
La Niña is the cold phase of ENSO — it produces roughly opposite effects to El Niño. If a La Niña develops in 2027, the typical pattern is:
- Atlantic hurricane season — more active, with reduced wind shear over the Atlantic
- Southern US — drier and warmer winters
- Pacific Northwest and Canada — cooler and wetter
- Australia and Indonesia — wetter, ending drought risk
- Global temperature — a slight cool-down from the El Niño peak, though still above the long-term trend
For the exact month-by-month probabilities as the ENSO cycle evolves, the IRI ENSO forecast plume and the El Niño Tracker update each month with the latest model ensembles.