As 2026 approaches its midpoint, an exceptionally strong El Niño event is developing in the tropical Pacific, significantly altering expectations for global temperatures both this year and next. The El Niño phenomenon, which releases oceanic heat into the atmosphere and disrupts weather patterns worldwide, is intensifying at one of the fastest rates in the modern observational record.
Data from six major temperature monitoring organizations show that the first half of 2026 ranks as the third-warmest period on record, trailing only 2024 and 2025. Individual months have trended increasingly warm, with May and June both ranking as the second-warmest ever recorded for those months, surpassed only by their 2024 counterparts. The tropical Pacific’s key temperature metric, the Niño3.4 index, crossed the 0.5-degree Celsius threshold for El Niño conditions in April, reached one degree in May, hit 1.6 degrees in June, and subsequently exceeded two degrees in early July. This progression represents one of the fastest El Niño onsets documented.
Forecast models suggest the El Niño could peak between July and December, potentially reaching unprecedented strength. Analysis of 667 model simulations from 14 different forecasting groups indicates a median peak of 3.59 degrees Celsius, with over 91 percent of runs predicting the strongest El Niño event since instrumental records began. When adjusted to account for long-term ocean warming from climate change, the relative measure still indicates a 77 percent probability of breaking the previous record from 1982-1983. Global temperature projections for the full year 2026 center around 1.51 degrees Celsius above pre-industrial levels, placing it second-warmest on record with a 35 percent chance of exceeding 2024’s record.
Temperature data reveals that more than 30 percent of Earth’s surface experienced its five-warmest start to a year during the first half of 2026, with notable heat anomalies across the Arctic, western Europe, and parts of North America. A severe European heat dome in late June set multiple national and regional records, including France’s June maximum of 44.3 degrees Celsius. Arctic sea ice has declined to record-low levels on 39 separate days through mid-July, while Antarctic sea ice remains below normal but has not reached recent record lows.
Looking ahead, projections for 2027 suggest even warmer conditions, with a 92 percent probability of setting a new global temperature record. If forecasts prove accurate, the 2020s will have produced new temperature records in multiple years, with several years substantially exceeding the Paris Agreement’s 1.5-degree Celsius threshold. The projections carry uncertainties dependent on the El Niño event’s exact peak strength and decay rate, though even conservative estimates position both 2026 and 2027 among the warmest years in the instrumental record.
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