The el nino forecast is at an inflection: Climate Impact Company projects El Nino development in Q2 2026 with possible strengthening in Q3, while the World Meteorological Organization highlights fading La Niña and a rising chance of El Niño through the spring and into mid-year. Both outlooks place the climate system in a period of heightened ENSO influence and advise caution amid a core predictability barrier.
What If the El Nino Forecast Materializes?
Climate Impact Company combines equatorial East Pacific upper ocean heat anomalies, Nino34 SSTA, and the southern oscillation index in a constructed-analog approach that projects El Nino development during Q2/2026 and a potentially strong El Nino evolving during Q3/2026. The company notes that upper-ocean heat in the eastern equatorial East Pacific became immense in February and identifies only two close analogs from the past 30 years—2022-23 and 1996-97—which featured moderate to strong El Nino emergence followed by early dissipation and a vigorous La Nina the next year. The conventional Nino34 SSTA is exactly normal in daily diagnostics but warmed by 0. 4C over the past month; the daily southern oscillation index is +2. 5, a value that endorses a lingering La Nina-like climate at present. Forecasters caution that this sits within the springtime ENSO predictability barrier, and confidence is noted to increase over the next 1–2 months.
What Happens When La Nina Returns in 2027?
Climate Impact Company’s constructed analogs indicate that a dissipating 2026 El Nino would be followed by La Nina returning mid-to-late 2027 and persisting into early 2028, with the intensity of each ENSO regime uncertain. The southern oscillation index and Nino34-based analogs in the Climate Impact Company work show agreement on El Nino ahead for 2026, while the constructed-analog consensus leans toward weak La Nina in the second half of 2027. Separately, the World Meteorological Organization outlines a stepwise increase in El Niño probability as La Niña fades: a roughly 60% chance of ENSO-neutral conditions in March–May rising to about 70% in April–June, with neutral conditions at about 60% in May–July and El Niño chance increasing to around 40% in that same window. Together, these diagnostics imply significant ENSO influence on global climate for the next two years, likely with opposing character from one year to the next.
What Should Decision-Makers Do Now?
Given the present assessments, planners and risk managers should treat the next 1–2 months as a critical window: the springtime predictability barrier reduces confidence now, but forecast confidence is expected to rise into late Q2. The combined signals—strong eastern equatorial subsurface heat, Nino34 warming, and a positive southern oscillation index—support preparing for an El Nino developing in 2026 while retaining contingency plans for a return to La Nina in 2027. Key practical steps include reviewing seasonal risk plans, stress-testing assumptions for opposing ENSO impacts year-to-year, and monitoring updates from operational ENSO centers.
| Institution | Primary Signal | Timing |
|---|---|---|
| Climate Impact Company | Constructed-analog projects El Nino in 2026; possible strong event in Q3; La Nina returns mid-to-late 2027 | Q2–Q3 2026 (El Nino); mid-to-late 2027 into early 2028 (La Nina) |
| World Meteorological Organization | La Niña fading; ENSO-neutral likely in spring with rising El Niño probability through mid-year | Mar–May and Apr–Jun neutral probabilities ~60–70%; May–Jul neutral ~60%, El Niño rising toward ~40% |
Uncertainty is explicit: the Climate Impact Company emphasizes the springtime ENSO predictability barrier and notes that intensity levels of the projected El Nino and returning La Nina are uncertain. The World Meteorological Organization frames probabilities that shift through spring into early summer. Together, these institutional signals counsel heightened vigilance rather than premature certainty.
In short, treat the el nino forecast as a conditional near-term planning signal: prepare for an El Nino developing in 2026 while keeping contingencies for a La Nina rebound in 2027.
