The 2026 El Niño Could Cost the Global Economy $3–7 Trillion: What the Data Reveals

The 2026 El Niño is no longer a forecast — it is here. On June 11, 2026, NOAA upgraded its ENSO status from Watch to Advisory, confirming El Niño conditions are present and strengthening . The emerging data from NOAA, NASA, the World Meteorological Organization (WMO), and financial analysts at Citigroup paints a stark picture: this event is on track to become one of the strongest on record, with potential economic losses running into the trillions of dollars.

Understanding the Economic Stakes: Citigroup's Warnings in Context

It is important to clarify what Citigroup has and has not projected. The bank has not released a single, headline-grabbing "total economic loss over five years" figure for the 2026 El Niño. Instead, its economists have issued multiple specific, sector-focused warnings:

• In May 2026, Citi warned of a "historically rare 'double shock'" — a Strait of Hormuz blockade combined with an exceptionally strong El Niño — calling the upside risks to energy and food prices "highly asymmetric" .
• In June 2026, Citi dropped its forecast for two RBI rate hikes after a US-Iran truce reduced oil-price risk, but still flagged El Niño-driven inflation pressure .
• Also in June 2026, Citi raised its cocoa price forecast to $5,000/tonne within three months and $6,000/tonne within a year, projecting a global cocoa deficit of 56,000 tonnes in the 2026–27 season .

These warnings point to a severe inflation and commodity channel, but the broader multi-trillion-dollar loss context comes from peer-reviewed academic literature.

Research by Callahan and Mankin, published in Science (2023), fundamentally changed the understanding of El Niño's economic cost. They found that the persistent suppression of country-level economic growth lasts 3–5 years after the event, far exceeding earlier estimates . Their key findings:

• 1997–98 El Niño: $5.7 trillion in global income losses .
• 2015–16 El Niño: ~$3.9 trillion in global income losses .
• Average El Niño: Reduces global income by roughly $3.4 trillion over a multi-year period .

A report from Morningstar, citing economists, provides a direct framework for 2026: a strong event would entail losses of $3 trillion to $5 trillion across five years (2.7%–3.2% of global GDP), and a super El Niño scenario could reach $7 trillion (6.4% of GDP) . This aligns with the peer-reviewed baseline.

NOAA and WMO Data: Strength and Persistence Through 2027

Both NOAA and the WMO are now in close agreement on the trajectory of this event.

NOAA's June 2026 position:

• El Niño conditions are present and strengthening .
• The latest weekly Niño-3.4 index was +0.7°C, while the far-eastern Niño-1+2 index hit +2.1°C .
• NOAA predicts a >95% probability of El Niño persisting through at least early 2027 .
• Crucially, there is a 63% chance of a "very strong" event (sea surface temperature anomalies exceeding +2.0°C) by late 2026 .
• NOAA's GFDL SPEAR model shows a "high probability of a very strong El Niño by fall" with reduced model uncertainty compared to the previous month — all 30 ensemble members showed a peak index above 2°C .

WMO's June 2026 position:

• Confirmed an 80% likelihood of an El Niño event between June and August 2026, projecting an event that will be "at least moderate—and possibly strong" .
• For the remainder of 2026, the probability of El Niño being firmly established rises to ~90% .

Persistence: Both agencies expect El Niño to strengthen through Northern Hemisphere winter 2026–27, with conditions continuing into early 2027 .

Satellite Evidence: What NASA and NOAA's Eyes in the Sky Reveal

Satellite data provides the most direct, real-time evidence of the ocean's changing state.

NASA's Sentinel-6 Michael Freilich satellite detected a clear precursor signal. Sea level height data collected from March to May 2026 revealed a large pulse of higher, warmer water moving from the western Pacific toward the coast of Colombia, Ecuador, and Peru — a classic warm Kelvin wave . NASA published an animation of this data in early June 2026, noting that the emergence of Kelvin waves early in the year is a strong signal that an El Niño event is likely to follow .

NASA Earth Observatory sea surface height observations from June 8, 2026 — days before El Niño was officially declared — showed "higher-than-normal sea surfaces (red) in the central and eastern Pacific" .

Niño 3.4 SST Anomaly Progression (IRI/Columbia & NOAA):

Period	Niño 3.4 SST Anomaly
Mar–May 2026	+0.48 °C
May 2026	+0.94 °C
Week centered June 10, 2026	+0.9 °C
Week centered June 17, 2026	+1.7 °C

NOAA CPC Diagnostic Discussion (June 23, 2026) confirmed strong basin-wide warming, with the most intense anomaly in the far eastern Pacific (Niño 1+2 region at +2.1°C) .

How the 2026 Cycle Compares to the 2015–16 El Niño

The 2015–16 event was one of the three strongest on record. Here is how the 2026 cycle stacks up.

Severity:

• The 2015–16 event peaked with SST anomalies near +2.6°C in the Niño 3.4 region.
• NOAA's current forecast gives a 63% chance that the 2026 event will surpass +2.0°C, which would place it in "very strong" territory — comparable to or potentially exceeding the intensity of 2015–16 .
• NOAA's GFDL SPEAR model shows reduced uncertainty and "high probability of a very strong El Niño by fall" .

Economic Cost:

• Earlier, narrower estimates for the 2015–16 event focused on sector-specific costs (e.g., Indonesia's Borneo fires alone cost ~$16 billion, or 1.9% of GDP) .
• Modern peer-reviewed research reveals the total cost is an order of magnitude larger: $3.9 trillion in global income losses for 2015–16 .

The Bottom Line: The 2026 cycle is forecast to be at least as strong as 2015–16, with a tail risk of exceeding it. Given the baseline growth drag identified in the literature, a "very strong" 2026 event would likely produce multi-trillion-dollar global income losses comparable to or larger than the $3.9 trillion attributed to 2015–16 . A separate study from NTU Singapore warns that cumulative losses from El Niño events could reach $35 trillion by 2100 under warming scenarios .