Weekly update · September 21, 2022
El Niño Update, Week of September 21, 2022: Niño 3.4 at -0.9 °C
In the week of September 21, 2022, the sea surface temperature anomaly in the Niño 3.4 region — NOAA's main El Niño indicator — was -0.9 °C (25.8 °C actual), which corresponds to La Niña conditions.
Compared with the previous week it held steady, and over the last four weeks it held steady.
Off the coast of Peru and Ecuador (Niño 1+2) the anomaly was -1.0 °C (it fell 0.2 °C); this coastal warming is what most affects rain on the South American Pacific coast.
| Region | Area | Anomaly | vs. last week |
|---|---|---|---|
| Niño 1+2 | coast of Peru and Ecuador | -1.0 °C | -0.20 |
| Niño 3 | eastern Pacific | -0.8 °C | 0.00 |
| Niño 3.4 | central Pacific (official index) | -0.9 °C | 0.00 |
| Niño 4 | western-central Pacific | -1.0 °C | -0.10 |
Niño 3.4, previous 52 weeks
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Frequently asked questions
Was there an El Niño in the week of September 21, 2022?
The weekly Niño 3.4 anomaly was -0.9 °C, below the −0.5 °C La Niña threshold. NOAA declares an event using the 3-month ONI and the atmospheric response.
Where do these numbers come from?
From NOAA's Climate Prediction Center weekly OISST v2.1 sea surface temperature data, published every Monday.
Source: NOAA CPC weekly OISST v2.1 (public domain). Generated automatically by El Niño Forecast; free to cite with a link.