West African rainfall projections show a gradient of precipitation decrease in the west and increase in the east  . This pattern is evident at 1.5℃ of global warming and the magnitude of change increases at higher warming levels . A reduction in length of the rainy season is projected over the western Sahel through delayed rainfall onset by 4-6 days at global warming levels of 1.5℃ and 2°℃ . Although there are uncertainties in rainfall projections over the Sahel , CMIP6 models project monsoon rainfall amounts to increase by approximately 2.9% per degree of warming , therefore, at higher levels of warming and towards the end of the century, a wetter monsoon is projected in the eastern Sahel .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report