Where will 2026 rank among the hottest years on record?
2026 looks very likely to finish as one of the hottest years ever, but there is still meaningful uncertainty about whether it will edge out every prior year for the top spot. I put the chance of a true number-one finish at 79%.
Analysis
The broad climate backdrop is extremely supportive of a record finish. By late October, 2026 has already accumulated an exceptionally warm first ten months, and the recent news points to unusually hot ocean temperatures plus a strengthening El Niño, both of which tend to lift global mean temperatures with a lag. That matters for this market because a year does not need to be uniformly hot to win outright; it mainly needs enough sustained warmth across the remainder of the year to preserve its lead against prior record years in the annual average. With the world already running hot and oceans providing a strong baseline of heat, the threshold for a number-one finish is plausibly within reach.
The main argument in favor of Yes is that El Niño often exerts its largest global temperature influence near the end of the calendar year or just after the peak in the tropical Pacific. If the current pattern persists into November and December, 2026 can keep adding anomalously warm months to an already elevated annual average. The fact that recent monthly and ocean indicators are still near the top of the historical distribution suggests the year does not need a dramatic surprise to secure the record; it mainly needs the expected late-year warmth to arrive as forecast. The market price around the mid-80s reflects that this is not just a speculative narrative but a fairly strong base case.
The biggest reason to keep the probability below the market price is that the resolution source is NASA’s land-ocean temperature index, not Copernicus or ERA5, and the ranking can differ slightly across datasets. A very warm year can still come in second if another year’s annual mean remains marginally higher in NASA’s series, especially if late-year temperatures moderate or if the expected El Niño signal underperforms relative to current expectations. There is also timing risk: some of the strongest climate impacts from El Niño can show up after the calendar year closes, which helps overall warmth but may not be enough to push 2026 over the top specifically in a year-end average. That makes this a strong favorite, but not a lock.
Arguments
For
- Arguments for Yes: The year is already tracking exceptionally warm, so only a modest amount of additional heat is needed to finish first.
- Arguments for Yes: An intensifying El Niño and unusually warm oceans typically support above-average global temperatures in the final months of the year.
Against
- Arguments against Yes: NASA’s annual ranking may differ slightly from Copernicus, so being the warmest in one dataset does not guarantee the top spot here.
- Arguments against Yes: If late-year anomalies weaken, 2026 could still end just behind an earlier record year rather than at number one.
Key drivers
- A strong El Niño into late 2026 should amplify global temperatures during the final months of the year.
- Already elevated ocean and land temperatures give 2026 a high starting point for its annual average.
- NASA and Copernicus records usually move together, but small dataset differences can change the final ranking.
Risk factors
- Late-year temperatures could cool enough to let another record year retain the top NASA ranking.
- The strongest El Niño temperature boost may arrive too late to fully affect the 2026 annual mean.
Scenarios
Best case
The remaining months stay persistently hot, El Niño adds a strong late-year temperature boost, and 2026 finishes as the warmest year in NASA’s record by a clear margin.
Most likely
2026 ends the year as one of the two or three hottest years on record, with a slightly better-than-even chance of taking the number-one position.
Worst case
Temperatures ease enough in the final stretch that 2026 narrowly misses the top spot and ends up second or third in NASA’s annual ranking.
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