ONI, ASO: +2.46 °C, a new record in NOAA's series
Updated: November 12, 2026 · 1 min read · Live dashboard
New record
+2.46 °C
August–October 2026
Previous record: +2.04 °C, August–October 1997.
Line of the source file
ASO 2026 29.23 2.46
As of November 12, 2026, from NOAA CPC Oceanic Niño Index (oni.ascii.txt). The agency may revise the value in a later release.
ONI, August–October (conventional, NOAA) reached +2.46 °C for August–October 2026. That is the highest reading in this series for the season: the previous record was +2.04 °C, set in August–October 1997. The margin is 0.42 °C.
2026–27 vs the three strongest El Niños on record
Monthly Niño 3.4 anomaly, aligned by event month
The Oceanic Niño Index is the three-month average of the Niño 3.4 anomaly. It is the number NOAA uses to declare and rank El Niño events, and its table goes back to 1950.
Seasonal values are compared only with the same season in earlier years, because the strongest season of a past event usually falls later in the year. A tie is not counted as a record.
The agency may still revise the value. Recent figures in these files are preliminary and are sometimes adjusted in later releases; the number here is what the file showed on November 12, 2026. If it changes, the live dashboard follows the file, and this page keeps its date.
The line of the source file with this value is printed above, so anyone can check it against the original.
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