Key probability thresholds from official forecasts:

• 81% chance that this El Niño will rank among the largest events in the historical record going back to 1950, according to the US National Weather Service .
• 66% chance of reaching "super" El Niño status (Niño3.4 index ≥ 2.0°C) by fall or winter, per NOAA's May outlook .
• 23 out of 26 models used in the forecast consensus agree that a super El Niño is coming by the end of the year .

Climate scientist Zeke Hausfather, reviewing 667 ensemble members from 14 different seasonal forecast models in July, described the outlook as a "potential record-smashing El Niño event" that "may end up the strongest by a truly mind-blowing margin" .

Several researchers told Nature on July 23 that the event is "on track to be the largest one in at least 150 years" . The European Commission's Joint Research Centre released an anticipatory analysis on July 16 warning that a record-strength event could have cascading global consequences across food security, water resources, and disaster risk .

Will 2026 Be the Hottest Year on Record?

The El Niño boost comes at a time when the planet is already exceptionally warm. The January–June 2026 global surface temperature departure was the third-highest in the 177-year record at +1.14°C above baseline, behind only 2024 and 2025 . The key question is whether the El Niño peak will arrive early enough in 2026 to lift the annual average above 2024's record, or whether that distinction will go to 2027.

Estimates vary by dataset and methodology:

• Carbon Brief estimated a 35% chance that 2026 will set a new annual record, a near-doubling in just four months, with virtually all the increase driven by ever-stronger El Niño forecasts .
• James Hansen's team at Columbia University takes a stronger view, concluding that 2026 is "on track to be the hottest year" in the instrumental record based on a physics-based approach that accounts for high climate sensitivity and recent increases in net climate forcing .
• The WMO forecasts an 86% chance that at least one of the next five years will set a new global temperature record, with 2027 seen as a possible peak year once El Niño's full heat reaches the surface .
• A more cautious view from Carbon Brief's earlier analysis, based on five different temperature datasets, suggested 2026 would likely land as the second-warmest year, with a 19% chance of surpassing 2024 .

The disparity stems from whether the El Niño peak arrives late enough in 2026 to fully register in the annual average or spills into early 2027. Hausfather noted the odds range from around two-in-three in NASA and Berkeley Earth data to around two-in-10 in ERA5 and one-in-10 in the JRA-3Q reanalysis .

Amazon Rainforest: An Ecosystem on the Brink

Perhaps the most acute risk from the 2026 El Niño is to the Amazon rainforest, which enters this event already severely weakened from the 2023–2024 drought.

Compounding stress: A study published in PNAS in April 2026 found that 53.7% of intact rainforest areas affected by the 2023–2024 drought will still not have recovered even seven years later . The forest is losing biomass, which reduces its ability to recycle water and maintain its microclimate. INPE-led research published in July found that the Brazilian Amazon is already experiencing longer dry seasons and rainfall changes previously projected for the 2030s and 2040s, meaning the system's resilience is eroding faster than expected .

Heat and fire: During the 2023–2024 El Niño, temperatures in the Amazon rose 2–4°C (3.5–7°F) above the forest's historical average . A new super El Niño could push conditions past critical thresholds, with the drier northeastern Amazon, northern Brazil, Colombia, and Venezuela facing extreme wildfire risk and rapidly falling river levels .

Government response: Brazil has increased wildfire spending and hired a record number of federal firefighters in anticipation of extreme drought .

World Weather Attribution has warned that 2026 could see "an unprecedented year of global fire" as El Niño compounds existing heat and dryness .

Human-Caused Climate Change vs. El Niño's Contribution

Scientists across multiple fields stress that this is a layered crisis, not a purely natural one. El Niño is a natural cyclical phenomenon, but it is now unfolding on top of a ~1.3°C human-caused warming baseline. The result is that every El Niño event pushes global temperatures higher than any comparable event in the past .

The rapid return of El Niño — just three years after the last one — is itself unusual. Hansen's team suggests that extreme background warming may be altering the dynamics of the ENSO cycle itself . Climate change is also making El Niño's impacts less predictable. Australian Bureau of Meteorology experts noted in June that the consequences of El Niño are "becoming increasingly unpredictable due to climate change," with traditional teleconnection patterns breaking down .

The WMO and UN agencies have emphasized that while El Niño provides the temporary heat boost, it is the decades of anthropogenic warming that have locked in the record-breaking baseline, making even moderate El Niños dangerous .

Urgent Calls for Preparation and Adaptation

A broad coalition of scientific bodies and international agencies has issued urgent warnings:

• The WMO formally activated El Niño alerts on June 2 and urged all countries to "bolster early warning systems" and prepare for above-average temperatures "nearly everywhere" .
• UN agencies (OCHA, FAO, WFP) warned on June 18 that millions already facing hunger, displacement, and economic hardship could face another major climate shock, and that "climate shocks are accelerating" .
• The European Commission's Joint Research Centre published a detailed anticipatory analysis calling for proactive adaptation measures across food security, water resources, health systems, and disaster risk reduction .
• NOAA and the US National Weather Service highlighted that the risks of a "historic event with the power to supercharge extreme weather" are rising and that preparation windows are narrowing .
• The World Weather Attribution consortium and climate scientists like Hansen are calling for accelerated adaptation investments, particularly in tropical regions where the combined heat-drought-fire risk is highest .

UN Secretary-General António Guterres added his voice to the calls, stating: "El Niño conditions will pour fuel on the fire of a warming world. Impacts will hit even harder, travel even farther, and cross borders with devastating speed" .

Bottom Line

The 2026 El Niño is intensifying faster than almost any event on record, with an 81% chance of ranking among the top historical events and strong potential to reach super El Niño status. It has already raised the odds of 2026 surpassing 2024 as the hottest year to 35–50%, depending on the model, with 2027 an even stronger candidate. The Amazon, still recovering from the 2023–2024 drought, faces the most acute ecosystem risk, and scientists across climate, ecology, and humanitarian fields are issuing coordinated calls for urgent preparation before the event peaks near year's end.

Key probability thresholds from official forecasts:

• 81% chance that this El Niño will rank among the largest events in the historical record going back to 1950, according to the US National Weather Service .
• 66% chance of reaching "super" El Niño status (Niño3.4 index ≥ 2.0°C) by fall or winter, per NOAA's May outlook .
• 23 out of 26 models used in the forecast consensus agree that a super El Niño is coming by the end of the year .

Climate scientist Zeke Hausfather, reviewing 667 ensemble members from 14 different seasonal forecast models in July, described the outlook as a "potential record-smashing El Niño event" that "may end up the strongest by a truly mind-blowing margin" .

Several researchers told Nature on July 23 that the event is "on track to be the largest one in at least 150 years" . The European Commission's Joint Research Centre released an anticipatory analysis on July 16 warning that a record-strength event could have cascading global consequences across food security, water resources, and disaster risk .

Will 2026 Be the Hottest Year on Record?

The El Niño boost comes at a time when the planet is already exceptionally warm. The January–June 2026 global surface temperature departure was the third-highest in the 177-year record at +1.14°C above baseline, behind only 2024 and 2025 . The key question is whether the El Niño peak will arrive early enough in 2026 to lift the annual average above 2024's record, or whether that distinction will go to 2027.

Estimates vary by dataset and methodology:

• Carbon Brief estimated a 35% chance that 2026 will set a new annual record, a near-doubling in just four months, with virtually all the increase driven by ever-stronger El Niño forecasts .
• James Hansen's team at Columbia University takes a stronger view, concluding that 2026 is "on track to be the hottest year" in the instrumental record based on a physics-based approach that accounts for high climate sensitivity and recent increases in net climate forcing .
• The WMO forecasts an 86% chance that at least one of the next five years will set a new global temperature record, with 2027 seen as a possible peak year once El Niño's full heat reaches the surface .
• A more cautious view from Carbon Brief's earlier analysis, based on five different temperature datasets, suggested 2026 would likely land as the second-warmest year, with a 19% chance of surpassing 2024 .

The disparity stems from whether the El Niño peak arrives late enough in 2026 to fully register in the annual average or spills into early 2027. Hausfather noted the odds range from around two-in-three in NASA and Berkeley Earth data to around two-in-10 in ERA5 and one-in-10 in the JRA-3Q reanalysis .

Amazon Rainforest: An Ecosystem on the Brink

Perhaps the most acute risk from the 2026 El Niño is to the Amazon rainforest, which enters this event already severely weakened from the 2023–2024 drought.

Compounding stress: A study published in PNAS in April 2026 found that 53.7% of intact rainforest areas affected by the 2023–2024 drought will still not have recovered even seven years later . The forest is losing biomass, which reduces its ability to recycle water and maintain its microclimate. INPE-led research published in July found that the Brazilian Amazon is already experiencing longer dry seasons and rainfall changes previously projected for the 2030s and 2040s, meaning the system's resilience is eroding faster than expected .

Heat and fire: During the 2023–2024 El Niño, temperatures in the Amazon rose 2–4°C (3.5–7°F) above the forest's historical average . A new super El Niño could push conditions past critical thresholds, with the drier northeastern Amazon, northern Brazil, Colombia, and Venezuela facing extreme wildfire risk and rapidly falling river levels .

Government response: Brazil has increased wildfire spending and hired a record number of federal firefighters in anticipation of extreme drought .

World Weather Attribution has warned that 2026 could see "an unprecedented year of global fire" as El Niño compounds existing heat and dryness .

Human-Caused Climate Change vs. El Niño's Contribution

Scientists across multiple fields stress that this is a layered crisis, not a purely natural one. El Niño is a natural cyclical phenomenon, but it is now unfolding on top of a ~1.3°C human-caused warming baseline. The result is that every El Niño event pushes global temperatures higher than any comparable event in the past .

The rapid return of El Niño — just three years after the last one — is itself unusual. Hansen's team suggests that extreme background warming may be altering the dynamics of the ENSO cycle itself . Climate change is also making El Niño's impacts less predictable. Australian Bureau of Meteorology experts noted in June that the consequences of El Niño are "becoming increasingly unpredictable due to climate change," with traditional teleconnection patterns breaking down .

The WMO and UN agencies have emphasized that while El Niño provides the temporary heat boost, it is the decades of anthropogenic warming that have locked in the record-breaking baseline, making even moderate El Niños dangerous .

Urgent Calls for Preparation and Adaptation

A broad coalition of scientific bodies and international agencies has issued urgent warnings:

• The WMO formally activated El Niño alerts on June 2 and urged all countries to "bolster early warning systems" and prepare for above-average temperatures "nearly everywhere" .
• UN agencies (OCHA, FAO, WFP) warned on June 18 that millions already facing hunger, displacement, and economic hardship could face another major climate shock, and that "climate shocks are accelerating" .
• The European Commission's Joint Research Centre published a detailed anticipatory analysis calling for proactive adaptation measures across food security, water resources, health systems, and disaster risk reduction .
• NOAA and the US National Weather Service highlighted that the risks of a "historic event with the power to supercharge extreme weather" are rising and that preparation windows are narrowing .
• The World Weather Attribution consortium and climate scientists like Hansen are calling for accelerated adaptation investments, particularly in tropical regions where the combined heat-drought-fire risk is highest .

UN Secretary-General António Guterres added his voice to the calls, stating: "El Niño conditions will pour fuel on the fire of a warming world. Impacts will hit even harder, travel even farther, and cross borders with devastating speed" .

Bottom Line

The 2026 El Niño is intensifying faster than almost any event on record, with an 81% chance of ranking among the top historical events and strong potential to reach super El Niño status. It has already raised the odds of 2026 surpassing 2024 as the hottest year to 35–50%, depending on the model, with 2027 an even stronger candidate. The Amazon, still recovering from the 2023–2024 drought, faces the most acute ecosystem risk, and scientists across climate, ecology, and humanitarian fields are issuing coordinated calls for urgent preparation before the event peaks near year's end.