2026 El Niño Shatters Pacific Temperature Records, Forecasters Warn of Wet California Winter

Key points

• NOAA confirmed that sea surface temperatures in the Niño 3.4 zone exceeded 3°C above average in September, a threshold previously reached only briefly in 2015.
• The Niño 3 region, closer to South America, has surpassed the 1997 record, with temperatures approaching 4°C above normal.
• Climate models from four North American agencies project the event will peak in November at approximately 4.1°C above normal, exceeding all previous records.
• The event’s eastward tilt is bending the jet stream south, increasing the likelihood of heavy rainfall and flooding in California during the winter months.
• The Pacific hurricane season has been hyperactive, with 18 named storms and eight hurricanes, while the Atlantic remains unusually quiet.

Background

This event follows a series of record-breaking weather anomalies in 2026, including August’s record global heat and moisture levels. Previous coverage noted that the El Niño was already fueling three Pacific hurricanes and disrupting global weather patterns, with economic risks and infrastructure strain anticipated. The current development confirms that the event is not only strong but also developing earlier and more intensely than historical norms.

How outlets are covering it

The Sacramento Bee emphasizes the unprecedented speed and magnitude of the temperature rise, highlighting that records are being broken months before the typical peak. The Guardian, through climate scientist Prof. Mat Collins, frames the event as a potential 'super El Niño' that could be the strongest in a thousand years, while noting the difficulty in separating the effects of natural El Niño cycles from human-caused global warming. Both sources agree on the event's strength but differ in emphasis: the Bee focuses on the immediate atmospheric coupling and California rainfall impacts, while the Guardian discusses broader global consequences, such as drought in the Amazon and wildfires in Indonesia, and the potential for future geoengineering interventions.

Why it matters

The record-breaking El Niño is already altering global weather patterns, leading to a hyperactive Pacific hurricane season and a likely wet winter in California. The event’s early peak and unprecedented strength suggest that its impacts will be more severe and prolonged than in previous years, with significant implications for agriculture, infrastructure, and global economies. The coupling between the ocean and atmosphere is creating a feedback loop that could intensify the event further, making it a critical factor in 2026-2027 weather and climate outcomes.

What to watch

Climate models predict the El Niño will continue to strengthen through November, potentially reaching 4.1°C above normal. The European climate model forecasts significantly wetter-than-normal conditions for Sacramento in December and January, with a 78% chance of above-average rainfall. The event’s influence is expected to persist into early 2027, with ongoing impacts on global weather patterns, including increased storm activity in the Pacific and potential droughts in other regions.