El Niño Breaks Pacific Temperature Record: What It Means For CT Winter

An exceptionally powerful El Niño is developing in the Pacific Ocean, with ocean temperatures breaking a daily record as scientists watch to see whether the event could become one of the strongest on record.

A daily ocean temperature reading in a key region of the tropical Pacific reached 3.11 degrees Celsius above the historical average on Sept. 21, surpassing the previous daily record of 3.08 degrees set in November 2015, according to an analysis of NOAA data by climate scientist Zeke Hausfather.

The climate pattern could have far-reaching consequences, from extreme heat in parts of the world to changes in winter weather across the United States.

In Connecticut, a strong El Niño could bring a warmer, wetter winter and potentially more nor'easters, according to climate experts who spoke with Patch.

But while the daily temperature record has fallen, NOAA scientists say it's too early to declare this the strongest El Niño in history. And for Connecticut, more storms won't necessarily mean more snow.

What Could El Niño Mean For Connecticut?

El Niño is part of a natural climate pattern called the El Niño-Southern Oscillation. El Niño develops when waters in the tropical Pacific Ocean become warmer than usual. Those changes can influence weather patterns around the world.

During El Niño winters, storms tend to follow a path across the southern United States and up the East Coast, according to Samantha Borisoff, a climatologist with Cornell University's Northeast Regional Climate Center.

That can bring wetter-than-normal conditions to coastal areas of the Northeast and potentially more nor'easters.

Anthony Artusa, a meteorologist with NOAA's Climate Prediction Center, said strong El Niños generally favor warmer and wetter winters in Connecticut.

If this event becomes stronger than the major El Niños of 1982-83, 1997-98 and 2015-16, those conditions would become more likely, he said, although they are not guaranteed.

But a wetter winter doesn't necessarily mean a snowier one.

“With snowfall it’s important to note that individual storm tracks strongly influence how much snowfall a particular area receives,” Borisoff said.

A coastal storm could bring rain to one part of Connecticut and heavy snow to another, depending on its path and the temperatures when it arrives.

Past strong El Niños have brought significant snowstorms to the Northeast, even during winters that were warmer than average overall.

Is This The Strongest El Niño On Record?

Not yet, according to NOAA.

While the recent daily temperature benchmark has drawn attention, scientists measure the strength of an El Niño using ocean temperatures averaged over three months.

NOAA also uses a newer measurement that accounts for the broader warmth of tropical oceans, helping scientists distinguish El Niño-related warming from unusually warm ocean temperatures elsewhere in the world.

Michelle L'Heureux, NOAA's El Niño–Southern Oscillation team lead, said August 2026 surpassed August 1997 using traditional ocean temperature measurements.

Using NOAA's newer relative measurement, however, August 2026 ranked second to August 1997.

Artusa said the current El Niño is off to an exceptionally strong start, but scientists cannot yet say whether it will surpass previous events.

If NOAA's three-month index reaches at least 2.5 degrees Celsius, the event would qualify as historic.

"No two El Niños are alike," L'Heureux said. "And, yes, I fully expect that this El Niño will have some distinguishing features that make it unlike other El Niños."

Does A Stronger El Niño Mean More Extreme Weather?

A stronger El Niño makes its typical weather patterns more likely, but there are no guarantees.

L'Heureux explained that if a region normally has a 50 percent chance of above-average precipitation during El Niño, a stronger event might increase that chance to 60 or 70 percent.

That still leaves a chance the expected conditions won't happen.

Other climate patterns can also influence winter weather, meaning Connecticut could experience cold spells, major snowstorms or dry stretches even if the season as a whole is warmer and wetter.

What About Climate Change?

Scientists cannot yet say what role human-caused climate change played in the development or intensity of this particular El Niño.

However, Borisoff said the combination of a strong El Niño and a warming climate is expected to contribute to warmer-than-normal global average temperatures.

A new analysis from the University of Chicago's Climate Impact Lab projects that unusually high temperatures associated with the developing El Niño could contribute to 451,000 additional heat-related deaths worldwide between June 2026 and February 2027, compared with an average year. Researchers also project 44 percent more extremely hot days.

Those figures are projections, not a count of deaths that have occurred. The analysis identifies parts of Africa, Southeast Asia, India and Brazil among the areas facing substantial increases in heat-related deaths.

For Connecticut, the immediate concern is how the developing El Niño will affect winter storms.

A warmer, wetter season and more coastal storms are possible. But exactly how much snow falls — and where — will depend on the individual storms that reach the region.