The 2026 North American summer season is entering a critical transition phase, and the latest forecasts point to a strong El Niño developing fast. The first detectable changes in pressure and temperature patterns are now appearing across the United States and Canada as a new powerful round of westerly wind anomalies moves across the tropical Pacific.
Over the past few weeks, increasingly strong indications have suggested that El Niño will be a major global weather driver in 2026 and 2027. The main ENSO region is already covered in warm anomalies, pushed by westerly wind bursts and weaker trade winds, and a massive underwater warm anomaly known as a Kelvin Wave has developed beneath the surface.
What makes the latest old farmer's almanac june forecast stand out is how far the numbers go. The NCEP CFSv2 model shows a very strong El Niño developing, with the forecast exceeding a Super El Niño threshold of +2 anomaly and continuing through November 2026. In the eastern regions, anomalies are peaking over +4.5, a level that would put this event in territory that could rival a historically record-strong El Niño if the forecast verifies.
El Niño is the warm phase of the ENSO region in the equatorial Pacific Ocean, and its reach can extend far beyond the water where it begins. Strong events can shift pressure systems and storm tracks, bringing massive flooding to some places, severe drought to others, and powerful storms along with it. That broader atmospheric circulation shift is what forecasters are watching now as the Pacific continues to warm.
The immediate question is no longer whether the pattern is changing, but how far the change goes. If the current signal holds into late 2026, the season ahead could be shaped less by a passing warm spell than by one of the most forceful El Niño events in years.
