INCREASING HUMANITARIAN NEEDS
By mid-October, NOAA’s Climate Prediction Center has declared La Nina conditions, which are expected to persist until February 2026.
La Niña-induced temperature and precipitation anomalies are expected from November 2025 to the first quarter of 2026 in southern Africa (wet conditions), Asia and the Pacific (wet conditions), the Caribbean (wet conditions), Central and South America (dry/wet conditions), Central Asia (dry conditions), Southwest Asia (dry conditions) and East Africa (dry conditions).
Climate change has the potential to amplify La Niña-induced rainfall and temperature anomalies, triggering unpredictable and potentially more extreme outcomes.
Humanitarian impacts of La Niña
Countries at risk
La Niña influences the frequency and intensity of storms across several regions worldwide. It typically strengthens the Atlantic hurricane season, leading to more frequent and intense hurricanes.
What does ENSO stand for?
ENSO stands for El Niño–Southern Oscillation, a periodic fluctuation in sea surface temperatures and in the air pressure across the equatorial Pacific Ocean.
ENSO is one of the main drivers of interannual climate variability. The two extreme ENSO phases are El Niño and La Niña. El Niño occurs when the surface waters in the central and eastern Pacific Ocean become warmer than average, while La Niña occurs when these waters become cooler than average.
These changes in sea surface temperatures can cause shifts in atmospheric pressure and winds, leading to changes in rainfall patterns, temperature, and other weather-related phenomena worldwide.
Although the ENSO cycle is independent of climate change, climate change can amplify the rainfall variability related to ENSO and increase the likelihood of extreme weather events. Global warming is also increasing ENSO variability, and strong El Niño and La Niña events have occurred more frequently than the pre-1960 average.
More frequent swings from a strong El Niño to a strong La Niña are anticipated in the future.
Click on this interactive diagram to explore the rainfall and temperature anomalies, the associated hazards, and the main humanitarian impact dimensions of La Niña.
GLOBAL HUMANITARIAN IMPACTS OF LA NIÑA
How does ACAPS assess the risk of La Niña impact?
The assigned risk level to the impacts of La Niña is based on expert judgement following an assessment per country of the indicators and factors listed as follows:
historical impact of previous La Niña events in the country
typical influence of La Niña from September to February in the country
seasonal precipitation and temperature forecasts
pre-existing humanitarian crises and vulnerabilities to La Niña-induced hazards
agricultural seasonality
national and local response capacity to natural hazards and their impact
expected impact on agriculture, livestock, and fishery
potential spillover effects of La Niña on local food prices and the economy
potential disease outbreaks and increased health needs.
Analysis products
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El Niño & La Niña Global Analysis
21 November 2025
La Niña Overview - anticipated humanitarian impact between November 2025-March 2026
DOCUMENT / PDF / 600 KB
This report provides a global overview of the anticipated humanitarian impact of La Niña between November 2025 and March 2026, aiming to support strategic planning and anticipatory action in the humanitarian sector.
22 April 2025
Myanmar: Exposure to seasonal hazards in earthquake-affected areas
DOCUMENT / PDF / 421 KB
Myanmar has recently been struck by a magnitude-7.7 earthquake and is approaching the start of its monsoon and cyclone seasons, with forecasts predicting above-average rainfall and temperatures. These challenging conditions, coupled with conflict, poverty, and diminished coping capacities, may present significant risks to the population.
13 November 2024
The Philippines: Impact of Tropical Cyclone Trami (Kristine) and Kong-rey (Leon)
DOCUMENT / PDF / 481 KB
By 11 November, Trami and Kong-rey had affected over 9.6 million people in 17 of the country’s 18 regions. By 12 November, there were nearly 893,000 people in humanitarian needs. By 31 October, a total of 160 cities and municipalities across the country had declared a state of calamity.
31 October 2024
Mexico: impacts of Hurricane John
DOCUMENT / PDF / 334 KB
The Pacific Coast of Mexico received the first landfall of Hurricane John on 23 September and then the second landfall on 27 September. Over 280,000 people have been affected in Guerrero and Oaxaca state, and at least 39,000 houses were damaged in Guerrero state. Over 40,000 hectares of crops have been destroyed.
31 October 2024
Chad: Impact of floods
DOCUMENT / PDF / 302 KB
Since late July 2024, Chad has been experiencing floods amid the heavy rains of the lingering rainy season (typically from May–October), affecting all 23 of the country’s provinces, 119 of 125 departments, and nearly two million people.