South Africa faces roughly 1,200 additional heat-related deaths between September 2026 and February 2027 as an intensifying El Niño drives extreme temperatures across the Global South. The Climate Impact Lab warns that the weather pattern could become the strongest on record, mirroring climate conditions projected for two decades from now.
Weather extremes rarely respect national borders.
The Human Toll Across the Global South
The latest projections from the Climate Impact Lab estimate that 451,000 people globally could die from extreme heat during the first nine months of the El Niño cycle, running from June 2026 to February 2027. These impacts concentrate heavily in the Global South, where vulnerable populations face compounding crises.
Across Africa’s Sahel region, the report projects 66,800 additional heat deaths over a six-month window. Nigeria accounts for about 31,400 of those projected fatalities, followed by Sudan with 17,500, Niger with 10,000, and Chad with 7,900. South Africa sits firmly within this high-risk zone, with its projected 1,200 additional fatalities carrying an estimated statistical range of plus or minus 90 deaths.
Teresa Zakaria, the World Health Organization’s Unit Head for Risk Reduction, Humanitarian Operations and Climate Change, warns that the most severe impacts emerge when climate shocks intersect with weak health systems, limited access to healthcare, food insecurity, displacement, and broader humanitarian crises.
Agricultural Pressures and Food Security
Higher temperatures and shifting rainfall patterns drive more than just heat stress; they trigger severe droughts, wildfires, and localized flooding. These disruptions threaten staple crops throughout major agricultural production zones, raising questions about regional food security and commodity pricing.
Responding to these risks, South Africa’s Department of Agriculture urged crop farmers to implement climate-smart agriculture designed to conserve soil moisture. Officials recommend that producers utilize implements aligned with Conservation Agriculture principles to minimize soil erosion, avoid expanding land under production unnecessarily, and prioritize suitable cultivars capable of withstanding dry and hot conditions.
| Region / Country | Projected Additional Heat Deaths | Primary Climate Drivers |
|---|---|---|
| Global Total (9-Month Window) | 451,000 | El Niño, Marine Heatwaves |
| Sahel Region (Combined) | 66,800 | Extreme Temperatures, Drought |
| Nigeria | 31,400 | Heat Stress |
| Sudan | 17,500 | Heat Extremes |
| Niger | 10,000 | Arid Conditions, Agricultural Strain |
| Chad | 7,900 | Drought, Displacement Crises |
| South Africa | 1,200 (±90) | El Niño, Agricultural Stress |
Disease Vectors and Institutional Resilience
Beyond direct thermal stress, the World Health Organization cautions that current meteorological conditions create favorable environments for cholera and disease-carrying insects. Mosquito populations thrive under shifted rainfall and temperature patterns, threatening an uptick in illnesses such as malaria, chikungunya, and dengue fever.
Yet, the outlook is not entirely unmanageable. Researchers emphasize that targeted emergency response and resilience measures can prevent tens of thousands of fatalities. The Climate Impact Lab’s Adaptation Inventory highlights proven interventions, including early-warning systems, designated cooling centres, and mandatory protections for outdoor workers.
The UN’s World Meteorological Organization notes that the current El Niño is forecast to be the strongest since comparable records began four decades ago, with knock-on effects persisting well into 2027. Compounding this, the European Union’s climate monitor reported that August marked the single hottest month ever recorded globally, accompanied by unprecedented ocean temperatures as Western Europe capped its warmest summer on record.
Mitigating these overlapping crises requires immediate deployment of adaptation strategies before seasonal temperatures peak.
