 1.5°C and 2°C global warming, GWL-15 and GWL-20, will impact rainfall onset dates, cessation dates, and length of the rainy season in West Africa under RCP 4.5 and RCP 8.5 scenarios. The study uses multi-model multi-ensemble simulation data sets from eight regional climate models to evaluate the ability of the model ensemble mean to reproduce observed characteristics of rainfall onset dates, cessation dates, and length of the rainy season in West Africa. The results show that the models reproduce these characteristics with few biases, but have high uncertainties associated with projections for rainfall cessation dates. While an increase in global warming from 1.5 to 2°C enhances late rainfall onset over the entire West Africa under RCP 4.5, it fosters early rainfall onset over the Sahel zone under RCP 8.5. The study has application in reducing the impacts of global warming over West Africa. This article was authored by Naomi Kumi and Babatoon Jay Abudan. We are article.tv, links in the description below.