Pacific Ocean temperatures cross 30 degrees Celsius as super El Niño builds toward December peak

Record warmth in the equatorial Pacific

Average sea surface temperatures in the equatorial Pacific's Niño 3.4 region reached 30 degrees Celsius as of 5 October, according to Climate Reanalyzer data from the University of Maine. That reading is 3.39 degrees Celsius above the 1991–2020 reference baseline. Across the wider ocean surface between 60 degrees south and 60 degrees north latitude, average temperatures measured 21.08 degrees Celsius, surpassing previous annual baselines outside polar regions. Helge Gößling, a climate physicist at the Alfred Wegener Institute in Bremerhaven, stated that temperatures in the zone had never reached this level since modern record-keeping began. The current values exceed the warm anomalies measured during the strong El Niño events of 1997 and 2015 by more than one full degree for this point in the autumn calendar.

Forecast trajectories and persistence

The World Meteorological Organization projects that ocean surface temperatures across the central and eastern Pacific will continue to rise between October and December. The agency assesses a near 100 percent probability that conditions will persist through February 2027, potentially placing the event among the strongest recorded since baseline measurements began in 1950. Celeste Saulo, the Secretary-General of the WMO, described the pace of the development in official assessments.

El Niño has arrived and is rapidly gaining strength.

Computer modeling from the European Centre for Medium-Range Weather Forecasts points to anomalies reaching approximately 4 degrees Celsius by December. Atmospheric scientist Ben Noll indicated that elevated sea temperatures could remain in place across six consecutive months, delaying the typical dissipation of the weather pattern.

I think the pace of decline will accelerate by May, but given just how large the anomalies are, the event may not fully conclude until summer.

Disruptions across global agricultural regions

As warm, moisture-laden air rises over the central Pacific, global wind patterns and jet streams shift away from their normal alignments. These atmospheric alterations raise drought risks across Indonesia, parts of Southeast Asia, northern South America, and southern Africa. Gößling warned of severe pressure on international crop yields if dry conditions hit multiple food-producing belts at the same time.

If these key agricultural regions are affected simultaneously, that can have serious consequences for the global food supply.

Conversely, coastal regions along western South America and sections of East Africa face elevated dangers of extreme downpours, flooding, and landslides. The central and eastern Pacific also face increased cyclone and hurricane development as ocean thermal energy fuels stronger tropical storms.

Atmospheric energy and historical comparisons

Calculations by the National Oceanic and Atmospheric Administration assign an 81 percent probability that the central Pacific will exceed a 2-degree anomaly threshold, a development documented only four times in the past 150 years. Fink noted that this cycle operates against a warmer baseline atmosphere than earlier episodes, including the 1877 event that contributed to more than 50 million deaths worldwide. He explained that the climate system now oscillates at a higher baseline energy level with larger volumes of airborne water vapor. Daniela Matei of the Max Planck Institute for Meteorology noted that anomalies could climb to 2.5 degrees or higher through December, placing the phase in the category colloquially termed a super El Niño.