Heat waves doubling: impacts and responses across Africa
Global heat waves have doubled: what's the impact for Africa?
Between May 2024 and May 2025, nearly half of humanity — roughly 4 billion people — experienced an average of 30 extra days of extreme heat, with temperatures higher than 90% of days recorded between 1991 and 2020 :contentReference[oaicite:1]{index=1}.
Why does warming intensify heat waves?
Extreme heat waves are now twice as common as they were thirty years ago. Research from World Weather Attribution, the Red Cross Climate Centre and Climate Central has shown that human influence has doubled their frequency :contentReference[oaicite:2]{index=2}. Climate change shifts the odds and intensity of extreme events — making them more likely and more severe, though such phenomena have always occurred :contentReference[oaicite:3]{index=3}.
Methodology: attribution and Climate Shift Index
To establish the link between warming and extreme heat, researchers use climate models comparing conditions with and without human influence. The Climate Shift Index helps estimate how many heat wave days are actually "caused" by climate change :contentReference[oaicite:4]{index=4}.
Health impacts: the silent killer
Heat waves cause dehydration, heat stroke, and worsen cardiovascular and respiratory disease. Deaths linked to heat are often underreported, being attributed to other conditions :contentReference[oaicite:5]{index=5}. Across Africa, these crises put enormous strain on health systems, power grids and agriculture.
Affected countries: focus on Africa
On the continent, 42 countries experienced at least one extreme heat episode between May 2024 and May 2025, with 14 facing multiple severe waves :contentReference[oaicite:6]{index=6}.
Sahel: record temperatures and deaths
In the Sahel (Mali, Niger, Burkina Faso), thermometers hit nearly 48 °C in early 2024, some 1.4 to 1.5 °C higher thanks to human-caused warming :contentReference[oaicite:7]{index=7}. In Kayes, Mali, hospital admissions for heat-related illness rose sharply.
South Sudan: schools shut down
In February 2025, a heat wave forced authorities to close schools for two weeks after children collapsed, a crisis worsened by lack of electricity, ventilation and clean water :contentReference[oaicite:8]{index=8}.
Southern and North Africa
Southern Africa was hit by four major extreme heat episodes in 2024 (two lasting five days each); their likelihood has increased up to ninefold :contentReference[oaicite:9]{index=9}. North Africa also suffered several intense waves.
Global context: 2024 sets records
The WMO confirms 2024 was Africa's hottest year on record, running 0.86 °C above the 1991–2020 average (1.28 °C in North Africa) :contentReference[oaicite:10]{index=10}. Surrounding oceans experienced unprecedented marine heat waves since 1993.
Globally, 2024 was the first year to officially exceed +1.5 °C of warming, and saw an average of 41 extra days of climate-driven dangerous heat :contentReference[oaicite:11]{index=11}.
Extreme events becoming more frequent
We're seeing more "climate whiplash" — rapid swings between drought and flooding — especially in East Africa, driven by a more humid atmosphere and increased variability :contentReference[oaicite:12]{index=12}.
Necessary responses: adaptation and mitigation
- Heat alert systems and health action plans :contentReference[oaicite:13]{index=13} ;
- Priority investment in vulnerable zones (Sahel, South Sudan) ;
- Expanding access to clean water, electrification, solar-powered cooling ;
- Rapid energy transition to cut fossil fuel emissions :contentReference[oaicite:14]{index=14} ;
- Strengthening medium-range heat wave forecasting capacity (ECMWF, Météo-France) :contentReference[oaicite:15]{index=15}.
Conclusion
Climate change has already doubled the frequency of heat waves worldwide, and Africa faces particular danger. These silent events affect health, education, farming, the economy and people's resilience. Without urgent action — both cutting emissions and adapting — the coming decades will bring ever more intense and destructive heat waves.
Useful links
Internal: Climate change adaptation | Droughts in Africa | Renewable energy
External: WMO: State of Africa's climate 2024 | AP: half the world affected | Phys.org: heat wave study
Extreme heat in Africa: when climate change doubles heat waves
Extreme heat in Africa: when climate change doubles heat waves
Between May 2024 and May 2025, research by World Weather Attribution and Climate Central found that nearly 4 billion people – or 49% of the world's population – experienced at least 30 extra days of extreme heat (source).
Temperatures during these days exceeded the 90th percentile of the hottest days between 1991 and 2020. This intensification is blamed on human-caused climate warming.
What is an extreme heat wave?
It's a prolonged period of heat well above seasonal averages, often with high humidity, putting human life, farming and infrastructure at risk.
The direct link to climate change
According to Joyce Kimutai, a climate scientist and study co-author, climate change doesn't create heat waves — it increases their frequency, duration and intensity.
Using rigorous climate attribution methods with counterfactual models, researchers calculated that without human emissions, half of these heat waves would never have happened (World Weather Attribution).
Health impact: the silent killer
Unlike hurricanes or floods, heat waves leave no visible destruction. Yet they cause:
- Hundreds of deaths from heat stroke, especially among children and the elderly.
- Strain on health services.
- Shortages of clean water in rural areas.
Africa particularly at risk
The African continent recorded 14 of the 67 extreme heat episodes worldwide that year. Among the hardest-hit countries:
- Burundi, Comoros, Ghana, Gabon: more than 90 days of extreme heat.
- Mali, Niger, Burkina Faso: temperatures exceeding 48 °C.
- South Sudan: schools closed for 2 weeks due to heat-related illness (source).
The Sahel case
In this semi-arid region, a heat wave between April and May 2025 saw temperatures exceed 47 °C. Climate change made this event 10 times more likely.
Why is this so serious?
Each fraction of a degree puts at risk crops, livestock, power systems, water networks, and above all human lives.
Climate change no longer threatens the future. It threatens the present.
Forecasts for coming years
Researchers predict that if greenhouse gas emissions aren't rapidly cut, Africa could face more than 120 days of extreme heat per year by 2035.
Adaptation and solutions for Africa
To limit the damage:
- Strengthen heat alert systems and raise community awareness.
- Improve access to water and cooling infrastructure.
- Fund climate adaptation in vulnerable countries (South Sudan, Sahel).
- Cut fossil fuel use globally.
Conclusion: a call to action
If COP28 commitments aren't backed by action, Africa — despite bearing little responsibility for warming — will continue to pay the heaviest price. It's urgent to finance the continent's resilience and cut global emissions.
Sources and references
- AP – Global heat study
- WMO – Africa climate report
- Phys.org – Regional impacts
- World Weather Attribution
Extreme heat in Africa: when climate change doubles heat waves
Between May 2024 and May 2025, research by World Weather Attribution and Climate Central found that nearly 4 billion people – or 49% of the world's population – experienced at least 30 extra days of extreme heat (source).
Temperatures during these days exceeded the 90th percentile of the hottest days between 1991 and 2020. This intensification is blamed on human-caused climate warming.
What is an extreme heat wave?
It's a prolonged period of heat well above seasonal averages, often with high humidity, putting human life, farming and infrastructure at risk.
The direct link to climate change
According to Joyce Kimutai, a climate scientist and study co-author, climate change doesn't create heat waves — it increases their frequency, duration and intensity.
Using rigorous climate attribution methods with counterfactual models, researchers calculated that without human emissions, half of these heat waves would never have happened (World Weather Attribution).
Health impact: the silent killer
Unlike hurricanes or floods, heat waves leave no visible destruction. Yet they cause:
- Hundreds of deaths from heat stroke, especially among children and the elderly.
- Strain on health services.
- Shortages of clean water in rural areas.
Africa particularly at risk
The African continent recorded 14 of the 67 extreme heat episodes worldwide that year. Among the hardest-hit countries:
- Burundi, Comoros, Ghana, Gabon: more than 90 days of extreme heat.
- Mali, Niger, Burkina Faso: temperatures exceeding 48 °C.
- South Sudan: schools closed for 2 weeks due to heat-related illness (source).
The Sahel case
In this semi-arid region, a heat wave between April and May 2025 saw temperatures exceed 47 °C. Climate change made this event 10 times more likely.
Why is this so serious?
Each fraction of a degree puts at risk crops, livestock, power systems, water networks, and above all human lives.
Climate change no longer threatens the future. It threatens the present.
Forecasts for coming years
Researchers predict that if greenhouse gas emissions aren't rapidly cut, Africa could face more than 120 days of extreme heat per year by 2035.
Adaptation and solutions for Africa
To limit the damage:
- Strengthen heat alert systems and raise community awareness.
- Improve access to water and cooling infrastructure.
- Fund climate adaptation in vulnerable countries (South Sudan, Sahel).
- Cut fossil fuel use globally.
Conclusion: a call to action
If COP28 commitments aren't backed by action, Africa — despite bearing little responsibility for warming — will continue to pay the heaviest price. It's urgent to finance the continent's resilience and cut global emissions.
Sources and references
- AP – Global heat study
- WMO – Africa climate report
- Phys.org – Regional impacts
- World Weather Attribution
Extreme heat in Africa: when climate change doubles heat waves
Between May 2024 and May 2025, research by World Weather Attribution and Climate Central found that nearly 4 billion people – or 49% of the world's population – experienced at least 30 extra days of extreme heat (source).
Temperatures during these days exceeded the 90th percentile of the hottest days between 1991 and 2020. This intensification is blamed on human-caused climate warming.
What is an extreme heat wave?
It's a prolonged period of heat well above seasonal averages, often with high humidity, putting human life, farming and infrastructure at risk.
The direct link to climate change
According to Joyce Kimutai, a climate scientist and study co-author, climate change doesn't create heat waves — it increases their frequency, duration and intensity.
Using rigorous climate attribution methods with counterfactual models, researchers calculated that without human emissions, half of these heat waves would never have happened (World Weather Attribution).
Health impact: the silent killer
Unlike hurricanes or floods, heat waves leave no visible destruction. Yet they cause:
- Hundreds of deaths from heat stroke, especially among children and the elderly.
- Strain on health services.
- Shortages of clean water in rural areas.
Africa particularly at risk
The African continent recorded 14 of the 67 extreme heat episodes worldwide that year. Among the hardest-hit countries:
- Burundi, Comoros, Ghana, Gabon: more than 90 days of extreme heat.
- Mali, Niger, Burkina Faso: temperatures exceeding 48 °C.
- South Sudan: schools closed for 2 weeks due to heat-related illness (source).
The Sahel case
In this semi-arid region, a heat wave between April and May 2025 saw temperatures exceed 47 °C. Climate change made this event 10 times more likely.
Why is this so serious?
Each fraction of a degree puts at risk crops, livestock, power systems, water networks, and above all human lives.
Climate change no longer threatens the future. It threatens the present.
Forecasts for coming years
Researchers predict that if greenhouse gas emissions aren't rapidly cut, Africa could face more than 120 days of extreme heat per year by 2035.
Adaptation and solutions for Africa
To limit the damage:
- Strengthen heat alert systems and raise community awareness.
- Improve access to water and cooling infrastructure.
- Fund climate adaptation in vulnerable countries (South Sudan, Sahel).
- Cut fossil fuel use globally.
Conclusion: a call to action
If COP28 commitments aren't backed by action, Africa — despite bearing little responsibility for warming — will continue to pay the heaviest price. It's urgent to finance the continent's resilience and cut global emissions.