How does a super El Niño affect global weather and records?

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1. 1

   2026–2027 El Niño event (Wikipedia)

   WikipediaPublished Oct 13, 2026Checked Oct 13, 2026

   “The 2026–2027 El Niño is the ongoing El Niño event, with its onset declared on 2 June 2026 by the World Meteorological Organization (WMO). It is the strongest El Niño ever measured for its time of year, and the World Meteorological Organization has reported that it will likely be the strongest El Niño on record, with it already being classified as a "very strong El Niño", also known as a Super El Niño. The 2026–2027 El Niño is expected to peak in November or December and last through early 2027.”

2. 2

   Physical understanding of the extreme global temperature jump in 2023.

   Communications earth & environment (Mex et al.)Published Mar 19, 2026Checked Oct 13, 2026

   “Global surface air temperature reached unprecedented heights in early boreal fall 2023, surpassing the previous record for year-to-year temperature increase by a significant margin. We attribute most of this temperature jump to the onset and maturing stages of the 2023 El Niño, with some contributions from the North Atlantic. Using a process-based analysis from multiple observational datasets, we show that the uniqueness of the 2023 event arose from the La Niña-like ocean-atmosphere state on which it developed. This background favoured (1) a steep year-to-year increase of Sea Surface Temperature, particularly in mean atmospheric subsidence regions, reducing low-cloud cover and giving rise to a record-breaking change in the radiative budget; (2) anomalously sustained precipitation over high sea surface temperatures in the Western Pacific, fuelling unusual diabatic heating compared to canonical El Nino events. This altogether led to an exceptionally early increase in tropical tropospheric temperature in boreal fall, ultimately influencing the jump in temperature at the global scale.”

3. 3

   Super El Niño events drive climate regime shifts with enhanced risks under global warming.

   Nature communications (Xue et al.)Published Dec 12, 2025Checked Oct 13, 2026

   “Climate regime shifts (CRSs), characterized by abrupt and persistent transitions between alternative stable states in the climate system, pose serious threats to ecosystems and human well-being. Understanding the potential drivers of CRSs is crucial, particularly in a warming world where CRSs are becoming more frequent. Here, using multiple observations and model simulations, we find that the likelihood of CRS occurrence significantly increases in the context of super El Niño events due to their remarkable climate perturbations. This higher probability is detected across various climate elements, such as surface air temperature, sea surface temperature, and surface soil moisture. In addition, we suggest that this boost effect of super El Niño events on CRSs will be greatly amplified under future greenhouse warming. Our findings underscore a deeper and more persistent climate footprint of super El Niño events, suggesting that early warnings and proactive measures are crucial for mitigating their escalating risks.”

4. 4

   Greenhouse warming exacerbates El Niño-induced Indian monsoon droughts.

   Nature communications (Zhao et al.)Published Jul 30, 2026Checked Oct 13, 2026

   “However, confidence in the projection of this enhancement remains relatively low. We attribute the model spread in ENSO-monsoon links to variations in ENSO-induced Walker circulation anomalies, primarily through zonal wind feedback processes. Through the use of multiple observations to constrain such atmospheric dynamic processes, we find that the observation-constrained sensitivity of monsoons to the ENSO by the end of this century will become almost 40% greater than that from 1963-2023. Such intensification occurs because, even if the degree of El Niño-induced sea surface warming remains unchanged, the response of tropical precipitation to sea surface warming will increase, causing further eastward displacement of Walker circulation anomalies and an increased subsidence over the Indian subcontinent, which will reduce monsoon precipitation further. Our findings suggest intensified hydrological extremes and increased risks for food security in India in a warmer future.”

5. 5

   An eastward-propagating coupled mode amplifying the early growth of extreme El Niño events.

   Science advances (Liang et al.)Published Sep 23, 2026Checked Oct 13, 2026

   “Extreme El Niño events are among the most consequential climate phenomena, yet their early prediction remains challenging. Here, by analyzing the 1982/1983, 1997/1998, and 2015/2016 events together with a large ensemble of climate model simulations, we identify an unusually early and reproducible ocean-atmosphere precursor to extreme El Niño: a slow, eastward-propagating coupled mode that develops in the western-central equatorial Pacific during boreal winter and spring. This mode features warm sea surface temperature anomalies coupled with sustained westerly wind anomalies. These westerly wind anomalies drive the equatorward transport of warm water, rapidly increasing equatorial ocean heat content and priming extreme El Niño growth in the following summer and fall. Ensemble hindcasts further reveal that East Asian cold surges and the North Pacific Oscillation can stochastically excite this equatorial mode, enabling skillful forecasts of extreme events as early as February and helping to overcome the spring predictability barrier.”

6. 6

   El Niño–Southern Oscillation (Wikipedia)

   WikipediaPublished Oct 13, 2026Checked Oct 13, 2026

   “El Niño–Southern Oscillation (ENSO) is a global climate phenomenon that emerges from variation in winds and sea surface temperatures over the tropical Pacific Ocean. Those variations have an irregular pattern, but do have some appearance of cycles. The occurrence of ENSO is not easily predictable. It affects the climate of much of the tropics and subtropics, and has links (teleconnections) to higher-latitude regions of the world. The warming phase of the sea surface temperature is known as "El Niño" and the cooling phase as "La Niña". The Southern Oscillation is the accompanying atmospheric oscillation, which is coupled with the sea temperature change. El Niño is associated with higher than normal sea level air pressure over Indonesia and Australia, and across the Indian Ocean to the Atlantic Ocean. La Niña has roughly the reverse pattern: high pressure over the central and eastern Pacific and lower pressure through much of the rest of the tropics and subtropics. The two phenomena typically last approximately one year each and typically occur every two to seven years with varying intensity, with neutral periods of lower intensity interspersed.”

7. 7

   Super El Niño sets another record as it strengthens to 'unprecedented levels'

   BBC NewsPublished Oct 13, 2026Checked Oct 13, 2026

   “El Niño has continued to strengthen, with several key measures now in record territory. Simon King explores how it compares to previous events.”