In brief
Copernicus has announced that 2026 is virtually certain to exceed 1.5 °C above pre‑industrial temperatures, making it the second year after 2024 to hit the controversial threshold. The service noted a 20 % chance that 2026 could tie or surpass 2024, and highlighted October as the warmest month on record. The forecast fuels debate over the meaning of a single‑year breach and the urgency of climate action, while underscoring the need for sustained data collection and policy response.
In a statement released on November 7, the EU’s Copernicus Climate Change Service (C3S) said that 2026 is virtually certain to rise above 1.5 °C of global warming relative to pre‑industrial levels, making it the second calendar year to meet that threshold after 2024.
WAM, the news outlet reporting the service’s assessment, noted that although surpassing the 1.5 °C mark in a single year does not constitute a formal long‑term threshold breach, the finding signals that global temperatures are already nearing critical limits.
C3S added that its models give 2026 a 20 % probability of matching or exceeding the record set in 2024, and projected that the four‑year average from 2023 to 2026 will also stay above the 1.5 °C boundary.
Co‑ordinated by the European Union’s Copernicus programme, the service uses satellite, ground‑based, and model data to provide near‑real‑time climate monitoring. The 2026 forecast follows a 2024 assessment that highlighted an unprecedented increase of more than two degrees in global temperature compared with the 1850‑1900 baseline.
A striking feature of the 2026 outlook is the record warmth of October. According to Copernicus, the month’s mean surface air temperature was 1.75 °C above the pre‑industrial average, making it the third consecutive month in which average global temperatures exceeded 1.5 °C.
The Financial Times, citing Copernicus data, also reported the 20 % chance of 2026 tying the 2024 record. The paper emphasized that these projections are not firm guarantees but indicate a high likelihood of continued temperature rise.
Environmental scientists point out that exceeding the 1.5 °C “bookmark” in one year—while not a formal breach of the Paris Agreement’s long‑term goal—underscores the urgency of reducing emissions to prevent further escalations. The event also raises practical questions: how will national climate policies respond to a new threshold breach? Will atmospheric monitoring agencies adjust their advisories or warning systems?
Some climate policy analysts argue that a single‑year threshold crossing should trigger immediate policy reassessment, while others caution that the Paris framework requires sustained averages over several years to count as a breach. This debate highlights the tension between headline‑drawn timelines and the science of climate change.
Historically, 2024’s record year was the result of a series of heatwaves and extreme weather events that pushed long‑standing records in many parts of the world. Copernicus emphasised that the 2026 forecast builds on these trends, suggesting that without aggressive mitigation, the 2025‑2026 period may become a new normal.
Beyond the scientific community, the 2026 forecast resonates with governments, businesses, and the public as separate stakeholders grapple with the costs of faster cooling, shifting crop patterns, and rising sea levels. Certainty about future warmth fuels the U.S. “first‑strike” ventilation model for climate negotiations and the EU’s shift toward more ambitious climate targets.
Key questions remain: will the 20 % probability of tying 2024 become a reality, and if so, will it cause a policy shift to reduce greenhouse emissions more aggressively? Will the baseline for the 1.5 °C threshold be reevaluated in light of single‑year data points? And how will global monitoring agencies share this data to foster more coordinated policy responses?
Countries are already aligning their development plans with the April 2023 UN bounds on climate variables, but the possibility of a second record year may prompt some to revise future targets. Likewise, weather prediction models will have to incorporate this near‑certain warming into their long‑term scenario building.
In the next months, Copernicus will release updated forecasts after the 2026 temperature field is fully analysed. The service’s track record of accurate early warnings—such as its 2018 forecasting of the Amazon wildfires—also lends credibility to its 2026 assessment.
As the climate community awaits further data, the near‑certainty that 2026 will cross the 1.5 °C threshold already compels many regions to accelerate action, reaffirming that incremental policy moves may not be sufficient to avoid the tipping points identified by climate scientists.
