Xweather’s climate team is tracking early signs that the tropical Pacific is starting to shift toward El Niño, but important spring forecast challenges remain. Sea surface temperatures are still officially in a neutral phase of the El Niño–Southern Oscillation (ENSO), yet the latest seasonal guidance suggests we may be heading toward an El Niño pattern with meaningful implications for temperatures, storms, and risk planning through the rest of 2026. 

Why ENSO matters 

The El Niño–Southern Oscillation (ENSO) is a repeating climate pattern in the tropical Pacific Ocean that has a big influence on weather around the world. It has three main phases: 

  • El Niño, when parts of the equatorial Pacific are warmer than normal 

  • La Niña, when they are cooler than normal 

  • A neutral phase in between 

These shifts might sound distant, but they help steer where heat, rain, and storms tend to go, even far from the Pacific. As ENSO moves between its phases, it can tilt the odds toward hotter or cooler seasons, wetter or drier conditions, and stronger or weaker storm seasons. 

For weather‑sensitive sectors, that translates into real decisions around energy demand, crop planning, transportation reliability, and seasonal risk management. That’s why even early hints of a shift toward El Niño matter. 

Where ENSO is right now 

At the moment, ENSO is in a neutral state, meaning we are not yet in El Niño or La Niña. However, ocean temperatures along the Pacific equator are running somewhat warmer than average across several key regions. 

In simple terms, the Pacific is starting to send early “hints” of a possible transition into an El Niño phase, but the pattern is not yet fully formed. This is a typical spring setup: the system is evolving, but it can still shift in either direction before locking in. 

Visualization created with Xweather Live

What current forecasts are telling us 

One of the leading global seasonal forecast systems, the ECMWF model, indicates that an El Niño phase of ENSO is likely to develop during the summer and strengthen into late summer and autumn. Some of the model’s scenarios even suggest a strong El Niño. 

However, this outlook needs to be treated with care: 

  • Spring is historically the most difficult time of year to predict how ENSO will evolve. Signals often look clearer now than they actually are. 

  • Since 2017, this particular model has tended to predict more warming in a key part of the Pacific than has actually occurred when looking many months ahead. 

On the positive side, when a strong El Niño was already taking shape in 2023, the same model tracked its development very well. That suggests forecast skill improves once a large, well‑organized ENSO signal is in place. 

Taken together, the message is that a shift toward El Niño is becoming more likely, but there is still uncertainty about how strong it will be and exactly how it will unfold. 

What a stronger El Niño could mean for the coming seasons 

If ENSO does move into a stronger El Niño phase and the atmosphere responds fully, it would increase the chances of certain seasonal patterns. These are not guarantees, but they tilt the odds in specific directions. 

For summer in North America, hotter conditions would be more likely in the Pacific Northwest, while parts of the Midwest and the eastern US could lean somewhat cooler than they otherwise might. For energy markets, that could mean stronger cooling demand in the Northwest and a softer extreme‑heat signal further east compared with a typical hot‑summer scenario. 

For tropical cyclone activity, El Niño tends to “shuffle the deck”: 

  • In the western Pacific, where typhoons form, activity would likely increase compared with recent La Niña‑leaning years. 

  • Over the Atlantic, stronger upper‑level winds typically make it harder for hurricanes to form and intensify. That would point toward a lighter‑than‑normal 2026 Atlantic hurricane season if El Niño fully develops. 

This does not remove hurricane risk entirely, but it reduces the likelihood of an exceptionally active season relative to La Niña years. 

Looking ahead to winter, strong El Niño events have historically led to more consistent and predictable large‑scale patterns. When the ocean and atmosphere are fully working together in an El Niño phase of ENSO, winters across much of North America have often ended up milder than average, with clearer, more stable patterns that can be easier to plan around. 

Growing confidence, guarded outlook 

With ENSO, the strength of the signal and our confidence in that signal are equally important. At this point, the signal toward El Niño is becoming more noticeable, but confidence is not yet high. 

Spring is the most challenging season for ENSO prediction, and April is a month when models are especially prone to larger errors. We also know that since 2017, the main seasonal model we are discussing has often forecast more warming in a key ENSO region than actually occurred at long lead times. 

The next two to three months will be critical. As we move into early summer, we will see more clearly whether the current warming in the Pacific consolidates into a robust El Niño phase of ENSO or remains weaker. That evolution will be key in determining both the strength of the event and the size of its impacts.