Why Scientists Are Watching the Possible 2026 El Niño So Closely

When this pattern develops, several types of extreme weather can intensify:

• Heatwaves: El Niño typically raises global average temperatures slightly, meaning heatwaves can become more intense when added to an already warm climate.

• Wildfires: Higher temperatures and shifts in rainfall can dry vegetation and extend fire seasons in vulnerable areas. Some researchers warn that a developing El Niño could contribute to an unusually severe global fire year.

• Flooding: While some regions become drier, others experience heavier rainfall as tropical convection and storm paths shift.

• Drought: Changes in atmospheric circulation can reduce rainfall in certain areas, increasing agricultural and water‑supply stress.

Because these impacts vary by region, El Niño rarely produces a single global pattern. Instead, it rearranges where heat, rain, and drought occur across the planet.

Why climate change is the bigger driver of risk

Scientists repeatedly emphasize that El Niño is not the root cause of today’s worsening climate extremes. It is a natural cycle that has existed for thousands of years.

What has changed is the background climate system.

Human‑driven warming from greenhouse‑gas emissions has raised global temperatures and increased the atmosphere’s capacity to hold moisture. As a result, similar El Niño events today can produce stronger heatwaves, heavier rainfall, and more intense drought conditions than decades ago.

In other words, El Niño acts more like an amplifier placed on top of a warmer baseline climate.

Recognizing this, NOAA introduced a newer metric—the Relative Oceanic Niño Index (RONI)—to better measure El Niño conditions while accounting for long‑term ocean warming trends.

Why disaster impacts could be worse than in the past

Weather hazards become disasters when they intersect with vulnerable communities. Several structural factors are increasing that vulnerability.

One is rising economic pressure linked to climate risk. Extreme weather is already driving up home‑insurance costs and, in some areas, making coverage harder to obtain. As climate‑related disasters grow more frequent and costly, insurance premiums and financial risk for households are rising.

Research also shows that climate‑related damage can worsen housing affordability and economic instability, particularly when rebuilding costs and insurance gaps leave families with large financial burdens after disasters.

Institutional capacity can also matter. Experts warn that reduced staffing, funding, or research capacity at forecasting and disaster‑response agencies can weaken preparedness and response systems that communities rely on before and after extreme weather events.

The bottom line

El Niño may return in 2026, and forecasts suggest the probability is rising. If it develops, the event could temporarily amplify extreme weather patterns across the globe.

But scientists consistently stress a larger point: the danger is not El Niño itself. The deeper risk comes from a warmer climate system that makes natural climate cycles far more powerful than they once were.

In that environment, even a moderate El Niño can produce stronger heatwaves, more volatile rainfall, and wider wildfire risk than similar events in the past—turning a natural climate fluctuation into a potential global stress test.