A major climate pattern shift is underway in the Pacific Ocean. Here's how El Niño works, why it matters for Atlantic hurricanes, and what the 2026 transition could mean for you.
What Is El Niño?
El Niño is one half of the El Niño-Southern Oscillation (ENSO), a climate pattern driven by changes in ocean surface temperatures along the equatorial Pacific. During an El Niño event, trade winds that normally push warm water toward the western Pacific weaken or reverse, allowing warm water to spread eastward across the central and eastern Pacific.
An El Niño is officially declared when sea surface temperatures in a specific region of the equatorial Pacific (called the Niño 3.4 region) rise at least 0.5°C (0.9°F) above the long-term average and maintain that anomaly for several months. The warmer the water, the stronger the El Niño.
La Niña is the opposite pattern — cooler-than-average waters in the eastern Pacific — and it typically has the reverse effect on weather patterns worldwide.
How El Niño Suppresses Atlantic Hurricanes
El Niño affects the Atlantic hurricane season primarily through two mechanisms.
Increased wind shear. El Niño causes stronger upper-level westerly winds over the Atlantic basin. These winds create vertical wind shear — a difference in wind speed or direction between the upper and lower atmosphere — that disrupts developing tropical systems. Hurricanes need a vertically aligned structure to strengthen. Wind shear tilts the storm, vents heat away from its core, and can tear a developing system apart before it becomes organized.
More stable atmosphere. El Niño tends to create a sinking motion in the atmosphere over the Atlantic, producing drier, more stable air. This suppresses the rising moist air that hurricanes need to form and intensify.
The numbers tell the story: during El Niño years since the 1960s, the Atlantic has averaged roughly 10 named storms and 5 hurricanes. During La Niña years, those averages jump to about 15 named storms and 8 hurricanes. During neutral years, averages fall in between at 13 named storms and 7 hurricanes.
The 2026 Transition
As of early 2026, the tropical Pacific is transitioning out of a fading La Niña and toward expected El Niño conditions. NOAA has issued an El Niño Watch, with approximately 62 percent probability of El Niño developing between June and August.
Some global forecast models suggest this El Niño could be strong — potentially reaching 1.5°C to 2°C above average in the Niño 3.4 region. If that happens, the suppressive effect on Atlantic hurricanes could be significant, particularly during the peak months of August through October.
However, the timing of the transition matters enormously. If El Niño develops quickly by early summer, it could suppress activity from the start of the season. If the transition is slower, there may be a window for early-season storms in June and July before El Niño's effects kick in.
There's also an outside chance — roughly 15 percent — of a "super El Niño," with Pacific temperatures rising 2°C or more above average. Super El Niño events (like 1997–98 and 2015–16) have historically been associated with markedly suppressed Atlantic hurricane activity, though they cause widespread weather disruption globally.
The 2023 Warning: When El Niño Met Record Heat
The 2023 hurricane season serves as an important cautionary tale. El Niño conditions were present, and conventional wisdom expected a quiet season. Instead, the Atlantic produced 20 named storms — well above average.
The reason: Atlantic sea surface temperatures in 2023 were the highest on record. The warm water provided so much fuel that it partially overcame El Niño's suppressive effects. Several storms intensified rapidly despite unfavorable wind shear patterns.
In 2026, Atlantic waters are expected to remain warm, though likely not at 2023's record levels. This means El Niño's ability to suppress activity will depend on how much warm water is available to counterbalance the increased shear.
What This Means for You
El Niño is a broad statistical factor that influences the overall number of storms across the entire Atlantic basin. It tells you something about the season's probable activity level. It tells you absolutely nothing about whether a specific storm will form, strengthen, and hit your community.
Some of the most devastating U.S. hurricanes have occurred during El Niño or neutral years. Hurricane Andrew (1992) struck during a quiet El Niño season that produced only six named storms total — but Andrew alone caused more damage than many entire active seasons combined.
The bottom line: a below-average forecast is not a reason to skip preparation. The forecasts are a planning tool for emergency managers and insurers. For you as an individual, the preparation checklist is the same regardless of whether the forecast calls for 10 storms or 20.
Frequently Asked Questions
Will El Niño prevent hurricanes from forming in 2026?
No. El Niño reduces the likelihood of hurricanes forming and intensifying, but it does not prevent them. Even strong El Niño years can produce individual storms that are extremely powerful and destructive.
When will we know how strong El Niño will be?
Confidence in El Niño forecasts improves through the spring. By June or July, forecasters should have a much clearer picture of El Niño's strength and timing, and seasonal hurricane forecasts will be updated accordingly.
Does El Niño affect where hurricanes go?
El Niño primarily affects whether hurricanes form and how strong they become, rather than steering their tracks. However, broader atmospheric pattern changes associated with El Niño can influence steering currents, potentially affecting where storms track.
What happened during the last major El Niño?
The strong El Niño of 2015–16 was associated with a below-average Atlantic hurricane season (11 named storms). However, it produced severe weather impacts globally, including drought in Southeast Asia and heavy rainfall across South America.