Seasons · 6 min read
Winter 2026-27 Forecast: What a Strong El Niño Means for the US
The Pacific Ocean is heading into one of the strongest El Niño events on record, and that shapes the odds for the coming US winter. El Niño doesn't decide the weather on any given day, but it does shift the chances of a wet, dry, mild or cold winter in different parts of the country. Here is what past El Niño winters have looked like, and what to watch for this year.
Photo: Architect of the Capitol, Wikimedia Commons (public domain)
- This winter: NOAA expects a strong to very strong El Niño through January-March 2027, with a more than 83% chance.
- The South: El Niño winters tend to be cooler and wetter across the southern US; the Gulf Coast signal held in more than 80% of El Niño events.
- The North: many northern areas tend to be warmer and drier than normal.
- California: the stronger the El Niño, the more reliable the wet signal; the two strongest events in 60 years brought much-above-median rain.
- Official outlook: NOAA publishes its US Winter Outlook for December to February on October 15, 2026.
In this article
How strong is this El Niño?What El Niño usually does to US wintersWill California get a wet winter?Will it be a mild winter?When is the official winter outlook?Frequently asked questionsHow strong is this El Niño?
In its update of October 8, 2026, NOAA's Climate Prediction Center wrote that El Niño continues to strengthen, with a strong to very strong El Niño likely through January to March 2027. It put the chance of a historic-strength event at 83% for October to December. The monthly sea surface temperature in the key Niño-3.4 region of the tropical Pacific was 2.1°C above normal.
El Niño is the warm phase of a natural cycle in the tropical Pacific, explained in more detail in our glossary entry on El Niño and La Niña. When the ocean there warms up, it shifts where the big thunderstorm clusters form over the Pacific, and that in turn changes the path of the jet stream over North America.
What El Niño usually does to US winters
According to NOAA's Climate.gov, El Niño's effects on US temperature and precipitation show up mainly in the cold half of the year, from October through March. The general pattern is a stronger southern jet stream that steers more storms across the southern half of the country, while the North sits more often in milder air.
The most reliable signal is along the Gulf Coast: from Texas to Florida, wetter-than-average conditions have occurred in more than 80% of El Niño events over the past 100 years. Across much of the South, winters tend to be cooler and wetter. Many northern areas tend to be warmer and drier, the Ohio Valley tends to be drier, and the Pacific Northwest and northern Rockies show a less reliable dry signal. Hawaii also often gets less rain than usual from late fall through early spring.
Will California get a wet winter?
For California and the Southwest, the link is weaker and depends on how strong El Niño becomes. The stronger the event, the more reliable the wet signal has been: the two strongest El Niño events of the past 60 years both brought much-above-median rain to California. Weak and moderate events are much less predictable, with roughly a third of them bringing above-average precipitation, a third near-average and a third below-average.
This year's event is expected to be strong to very strong, which tilts the odds toward a wetter California winter, but it is not a guarantee. Even in a wet winter, the rain tends to arrive in a few big storms rather than spread evenly over the season.
Will it be a mild winter?
Temperature signals are less reliable than precipitation signals, and they vary from one El Niño to another. In strong events, the northern and central US have often run warmer than average: the winters of 1997-98, 1982-83 and 1991-92 saw few below-average temperatures across much of the country.
A mild winter on average doesn't rule out cold snaps or big snowstorms. A single outbreak of Arctic air or one major nor'easter can still dominate a winter, whatever El Niño is doing. For your own city, the 14-day forecast is the place to look once a specific week comes into view.
When is the official winter outlook?
NOAA's National Weather Service publishes its US Winter Outlook for December 2026 through February 2027 on Thursday, October 15, 2026. That outlook combines El Niño with other factors and gives the odds of a warmer, colder, wetter or drier winter for each region. El Niño also helps explain why the 2026 Atlantic hurricane season was so quiet, as we wrote about in our article on Hurricane Isaias.
Frequently asked questions
Will winter 2026-27 be mild or cold in the US?
With a strong El Niño, the odds favor a milder winter across many northern areas and a cooler, wetter winter across the South. That is a tendency, not a guarantee; cold snaps can still happen.
Does El Niño mean a wet winter for California?
The stronger the El Niño, the more reliable the wet signal. The two strongest events of the past 60 years brought much-above-median rain to California, and this year's event is expected to be strong to very strong.
Where is El Niño's effect the most reliable?
Along the Gulf Coast from Texas to Florida, where wetter-than-average conditions occurred in more than 80% of El Niño events over the past 100 years.
When does NOAA release the 2026-27 winter outlook?
On Thursday, October 15, 2026. It covers December 2026 through February 2027.
Check the weather in Washington, D.C. or search another place on the locations page.