Global Temperature Records 2026

Early 2026 climate data and forecasts are painting a complex picture for where the year will ultimately rank among the hottest on record, with ENSO dynamics emerging as the decisive variable. January 2026 proved to be one of the most meteorologically volatile months in recent history, characterized by simultaneous cold waves driven by a weakened polar vortex and sharp heat spikes in multiple regions — a pattern that complicates straightforward temperature trend assessments for the year's opening months.

Significant heat events have already been recorded in the Southern Hemisphere. Argentina and Australia experienced record-breaking temperatures and wildfires in early 2026, consistent with the broader trajectory of anthropogenic climate change. These regional extremes, while notable, reflect localized conditions and do not by themselves determine the global annual mean temperature that will ultimately determine 2026's ranking in NASA's Land-Ocean Temperature Index.

The most consequential factor now being tracked by scientists is the evolution of the El Niño–Southern Oscillation (ENSO). NOAA has warned that El Niño could return as early as June 2026, a development that would substantially amplify global heat and could position 2026 as a contender for the top of the temperature record. The years 2023 and 2024 both benefited from strong El Niño forcing, with 2024 ranking as the hottest year on record. If a new El Niño materializes mid-year as projected, 2026 could challenge or surpass that benchmark. However, the current ENSO state remains a key uncertainty — a prolonged neutral phase or La Niña persistence through the second half of the year would likely keep 2026 from reaching the very top of the rankings.

The overall direction of evidence suggests 2026 is unlikely to rank outside the top several hottest years given the long-term greenhouse gas forcing baseline, but whether it claims the number one position depends heavily on whether El Niño develops on the timeline NOAA has indicated. The coming months — particularly the ENSO status assessments through spring and early summer 2026 — will be critical in narrowing the range of likely outcomes for the year's final temperature ranking.