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The Amazon can begin drying and burning before El Niño reaches its usual ocean-temperature peak because El Niño is an ocean-atmosphere circulation pattern, not just a Pacific thermometer reading. In 2026, rainfall disruption and fire activity appeared in the central and eastern Amazon in September, while forecasts still show the event strengthening toward its normal November–February peak.
That timing is why the current fires are not evidence that El Niño has already peaked. They are an early consequence of the atmospheric and seasonal rainfall changes that arrive before the Pacific sea-surface-temperature maximum.
When will this El Niño peak, and how strong is it?
The World Meteorological Organization says El Niño typically reaches its peak between November and February. The 2026 event was still building in October, with official forecasts pointing to a strong-to-very-strong episode through the first quarter of 2027.
| Forecast or observation | Value | What it means |
|---|---|---|
| NOAA advisory, June 11, 2026 | 63% | Chance that sea-surface temperatures would exceed 2.0°C in a monitored Niño region. |
| NOAA Climate Prediction Center diagnostic discussion, October 8, 2026 | Greater than 83% | Chance of a strong-to-very-strong El Niño continuing through January–March 2027. |
| October 2026 Niño indices | +2.1°C in Niño-3.4; +3.0°C in Niño-3; +3.9°C in Niño-1+2 | Warm anomalies in three standard Pacific monitoring regions, reported by NOAA’s Climate Prediction Center. |
“Super El Niño” is a media description, not an official WMO classification. WMO says the term is not part of its operational system and is not used in official products. In an official forecast context, “very strong El Niño” is the more precise wording.
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Why can the Amazon burn before the Pacific temperature peak?
El Niño changes tropical Pacific convection and the Walker circulation. Those atmospheric shifts redistribute where air rises, where clouds form and where seasonal rain falls. A region can therefore experience a longer or more intense dry spell while Pacific sea-surface temperatures are still climbing.
In the Amazon, reduced or disrupted rainfall lowers moisture in vegetation and soils. Forest edges and areas that burned previously can be especially susceptible to renewed fire. The result is a fire-weather response that can begin weeks or months before the El Niño index reaches its maximum.
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That answers the common question “Does El Niño cause Amazon drought?” El Niño can drive drought conditions by changing rainfall patterns, but it does not explain every ignition or every local fire by itself. The timing and severity of burning also depend on how dry a particular area becomes, whether it has burned before and when the next rainy season arrives.
What NASA has observed since September 2026
NASA reported a sharp increase in fire activity and smoke emissions across the central and eastern Amazon beginning in September 2026. Its Earth Observatory described the drought accompanying El Niño as leaving the rainforest “primed to burn” and said scientists believed the region had entered the early stages of a long and severe fire season.
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The cited NASA account does not provide one basin-wide Amazon fire-count total. The evidence is instead a combination of satellite-observed increases in fires and smoke, regional timing and the rainfall outlook. That distinction matters: observed fire activity is not the same as a forecast probability, and a single number cannot summarize conditions across the entire basin.
Amazon fire timing is staggered by region
There is no single Amazon-wide peak date. NASA’s outlook separates the early central/eastern phase from a later risk window farther south.
| Region | What is happening | Expected timing |
|---|---|---|
| Central and eastern Amazon | NASA observed increased fire activity and smoke emissions. | Early phase began in September 2026. Fires around Santarém and Manaus may continue until seasonal rains arrive in December 2026 or January 2027. |
| Southern Amazon in Brazil and Paraguay | NASA projects a later drought and fire-risk maximum. | Risk is expected to peak around August and September 2027, according to NASA Earth system scientist Douglas Morton. |
| Entire Amazon basin | A single basin-wide fire-count total was not stated in the cited NASA account. | Conditions vary by subregion and by the arrival of rain. |
The staggered calendar explains how fires can be serious now without representing the final impact of the 2026–27 El Niño. Rainfall may end the current central and eastern phase before the southern Amazon reaches its own highest-risk period.
How bad could the 2026–27 fire season become?
The available evidence supports an unusually dangerous setup, but it does not establish a final fire total. NOAA’s probabilities describe the likelihood and strength of the El Niño climate pattern; NASA’s satellite observations describe fires and smoke already occurring. Neither number should be presented as a direct prediction of how many hectares will burn.
Morton said, “Given the intensity of this El Niño, this really is the year for people to avoid burning at all costs.” His warning reflects the combination of severe climate stress and the possibility that human-set fires can spread through unusually dry landscapes.
The broader climate consequences are not limited to the Amazon. WMO Secretary-General Celeste Saulo said the event would intensify the chances of drought and heavy rainfall, along with heatwaves on land and marine heatwaves in many regions. Those are global risks associated with the pattern; they do not mean every location will experience the same outcome.
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- Pacific indicators: NOAA’s Niño-region measurements and outlooks will show whether the event is still intensifying as it approaches the November–February peak window.
- Rainfall and the Walker circulation: Continued disruption of seasonal rain is the mechanism that can keep fuels dry even before the ocean anomaly peaks.
- Satellite fire and smoke signals: NASA observations can show whether the central and eastern surge is easing when rains arrive or whether smoke and fire activity are expanding.
- Regional timing: Conditions near Santarém and Manaus should be judged against the December 2026–January 2027 rainy-season window, while southern Brazil and Paraguay should be monitored for the later August–September 2027 risk period.
The key point is timing: a strong 2026 El Niño is still developing, but its rainfall effects have already made parts of the Amazon easier to burn. The current fires are an early phase of the event, not proof that the event has already passed its peak.
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