Sea surface temperatures around Africa are projected to increase by 0.5°C-1.3ºC for 1.5°C global warming and increase by 1.3ºC-2.0℃ for 3ºC global warming . Globally, 87% of observed marine heatwaves have been attributed to human-caused global warming, and at 2°C of global warming, nearly all marine heatwaves would be attributable to heating of the climate caused by human activities . Increases in frequency, intensity, spatial extent and duration of marine heatwaves are projected for all coastal zones of Africa. At 1°C and 3.5℃ of global warming, the probability of marine heatwave days is between 4-15 times and 30-60 times higher compared to the pre-industrial  99th percentile probability, with highest increases over equatorial and sub-tropical coastal regions . These events are expected to overwhelm the ability of marine organisms and ecosystems to adapt to these changes . Reducing emissions and limiting warming to lower levels reduces risk to these systems  .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report