Strong El Niño Likely to Push Global Temperature Past 1.5 °C Limit Within 18 Months

TL;DR: A strong El Niño expected in the next year and a half could lift global average annual temperature above the 1.5 °C warming limit. Recent research shows this temporary spike may lock in new climate regimes that affect weather worldwide.

Context El Niño is the warm phase of a natural ocean‑atmosphere cycle centered in the tropical Pacific. During an event, heat stored in the Western Pacific Warm Pool moves eastward, releasing energy into the atmosphere and reshaping storm tracks, rainfall and temperature patterns across the globe. The Warm Pool spans roughly four times the area of the continental United States, making it the largest reservoir of warm ocean water on Earth. Scientists monitor this region using satellite sea‑surface temperature records from NOAA’s Advanced Very High Resolution Radiometer dataset.

Key Facts A 2024 study published in *Nature Climate Change* by researchers at the Scripps Institution of Oceanography examined 40 years of satellite observations and ran thirty coupled climate model simulations. They found that a strong El Niño occurring within the next 12‑18 months could raise the global average annual temperature by about 0.2 °C above the 2020‑2022 baseline, enough to exceed the 1.5 °C threshold established in the Paris Agreement. The authors also reported that strong El Niño events can trigger climate regime shifts—abrupt, persistent changes in heat, rainfall and drought patterns that may last several years after the ocean event subsides.

What It Means If the projected El Niño reaches the forecast strength, the temporary temperature increase could influence the likelihood of extreme heat waves, intense rainfall in some regions and prolonged drought in others. These shifts may affect agricultural yields, fisheries and water resources on a multi‑year horizon. Policymakers may need to treat the 1.5 °C limit as a near‑term benchmark rather than a distant goal, adjusting adaptation plans accordingly. Scientists will watch the Pacific’s sea‑surface temperature anomalies and updated model forecasts over the coming months to confirm whether the event attains the strength needed to push the planet past the guardrail.