Africa's rapidly growing cities will be hotspots of risks from climate change and climate-induced in-migration, which could amplify pre-existing stresses related to poverty, informality, social and economic exclusion, and governance . Urban population exposure to extreme heat is projected to increase from 2 billion person-days per year in 1985-2005 to 45 billion person-days by the 2060s  and to 95 billion person-days , with greatest exposure in westAfrica. Under relatively low population growth scenarios, the sensitive populations  in African cities exposed to heat waves of at least 15 days above 42℃ in African cities is projected to increase from around 27 million in 2010 to 360 million by 2100 for 1.8°C global warming ) and 440 million  for >4℃ global warming. Compared to 2000, urbanisation is projected to increase urban land extent exposed to arid conditions by around 700% and exposure to high-frequency flooding by 2600% across west, central and east Africa by 2030. 
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report