Recent ERA5-based analyses and near-complete September 2026 observations place global mean temperatures at approximately 16.27°C, trailing the September 2023 record of 16.38°C by about 0.10°C with negligible remaining uncertainty from the final day. This positioning reflects persistent ocean heat content and El Niño influences that sustained elevated anomalies through the Northern Hemisphere summer, yet fell short of the prior September peak due to seasonal cooling patterns and regional variability. Official final rankings from Copernicus or NOAA could shift only with substantial data revisions, while any late intensification or measurement adjustments remain low-probability outliers given the narrow observed gap.
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