At a Glance

Forecasters at NOAA's Climate Prediction Center say El Niño conditions are increasingly likely to develop during the middle of 2026. That does not guarantee major weather disruptions, but it has drawn attention because El Niño events can influence temperatures, rainfall, droughts, storms, and fisheries across large parts of the world.

El Niño is part of a larger climate cycle called ENSO, short for El Niño-Southern Oscillation. The cycle shifts between warmer and cooler conditions in the tropical Pacific Ocean and can affect weather patterns far beyond the ocean itself.

Experts caution that seasonal climate outlooks are based on probabilities, not certainties. Forecast confidence changes over time, especially months in advance. NOAA has said current projections point toward a growing chance of El Niño emerging later in 2026, but the exact strength and impacts remain uncertain.

Why This Matters

El Niño can influence weather in different ways depending on the region and time of year. In the United States, stronger El Niño patterns have sometimes been linked to wetter conditions across parts of the South and milder winters in northern states. Other parts of the world may see drought, heavy rainfall, heat, or changes in tropical storm activity.

The effects are not always the same from one event to another. Geography, ocean temperatures, atmospheric conditions, and timing all play a role. That is why forecasters avoid making overly specific predictions too early.

The forecast also matters for agriculture, emergency planning, water management, energy demand, and shipping. Governments and businesses often monitor ENSO outlooks months ahead because even moderate shifts in rainfall or temperature patterns can affect crops, reservoirs, wildfire risk, and infrastructure.

Background

ENSO is a naturally occurring climate cycle centered in the tropical Pacific Ocean. Scientists track it by monitoring ocean temperatures, atmospheric pressure patterns, wind conditions, and subsurface ocean heat.

The cycle generally has three phases: El Niño, La Niña, and ENSO-neutral conditions. During El Niño, parts of the central and eastern tropical Pacific become warmer than average. During La Niña, those waters become cooler than average. ENSO-neutral means conditions are near long-term averages and neither pattern is dominant.

NOAA and the National Weather Service issue regular diagnostic discussions and seasonal outlooks to estimate how likely each phase may be in the coming months. These outlooks combine ocean observations, historical patterns, and climate models.

Current forecasts point to warming ocean conditions beneath the surface of the tropical Pacific. Forecasters often watch subsurface heat closely because it can signal future changes at the ocean surface. When enough warmer water rises and spreads across key regions of the Pacific, El Niño conditions can develop.

Key Terms

El Niño: A climate pattern marked by warmer-than-average sea-surface temperatures in parts of the central and eastern tropical Pacific Ocean. It can influence weather around the globe.

La Niña: The opposite phase of the cycle, marked by cooler-than-average tropical Pacific waters. La Niña can also reshape weather patterns worldwide.

ENSO-neutral: A middle state in which ocean and atmospheric conditions are near average and neither El Niño nor La Niña is dominant.

Sea-surface temperature: The temperature of the upper layer of the ocean. Scientists track changes in these temperatures to identify climate patterns like El Niño and La Niña.

Subsurface ocean heat: Warmth stored below the ocean surface. Rising subsurface heat can sometimes signal that El Niño conditions may develop later.

Seasonal outlook: A forecast that estimates the probability of temperature and precipitation trends over weeks or months. Seasonal outlooks do not predict exact daily weather events.

Climate variability versus climate change: Climate variability refers to natural shifts in weather and climate patterns over time, including ENSO cycles. Climate change refers to longer-term warming trends and related climate changes driven largely by greenhouse gas emissions. Scientists say the two can interact, but they are not the same thing.

What Happens Next

Forecasters will continue monitoring Pacific Ocean temperatures and atmospheric conditions through the coming months. NOAA regularly updates its ENSO outlooks as new data becomes available.

Experts say confidence in seasonal forecasts generally improves as potential El Niño conditions become more established. Early outlooks are useful for preparation, but they also carry uncertainty.

For now, forecasters are watching for signs that warming ocean waters could strengthen enough to officially shift the Pacific into El Niño territory later in 2026. Whether the event becomes weak, moderate, or strong remains unclear.

Scientists also caution against treating any single weather event as proof of El Niño or climate change on its own. Weather patterns are shaped by many factors, and the effects of ENSO can vary widely from place to place.

Reporting note: Reporting draws on NOAA Climate Prediction Center materials, National Weather Service seasonal outlook guidance, Associated Press reporting, and reviewed scientific background context. Forecast probabilities and climate impacts This article was produced with AI-assisted research and reviewed by an editor before publication.