The performance of ectotherms strongly correlates with environmental temperature. The way temperature affects their performance has a strong impact on their realised fitness and their biotic interactions. In a thermally heterogeneous environment, interacting species with dissimilar thermal performances may cohabit by using different thermal micro-sites while species with close thermal performances may face strong competition for similar thermal micro-sites. Indeed, closely interacting species sharing the same resource and habitat are likely to share close thermal performance, and the preference for similar thermal micro-sites would increase competition level. Our work focus on the impact of temperature on the competition between two parasitoid species, Dinarmus basalis and Eupelmus vuilleti, in which females compete to access their common hosts, larvae of Callosobruchus maculatus, a crop pest of Vigna unguiculata. These species co-exist in western Africa, in a tropical savanna climate characterized by high temperatures (40-45°C). We measured the temperature dependence of several traits related to their fitness (oviposition rate, juvenile survivorship, developmental time, fecundity and size at emergence) and used the established thermal performance curves (TPC) as tools to predict their realised performance and anticipate the risk of increased competition that may result. We predicted that both parasitoid species have a similar thermal optimum, over 30°C with a relatively narrow thermal breadth. These TPCs would be coherent with the hot and stable environment they encounter in Africa. Our first results are in accordance with our predictions, as the two species present a thermal optimum around 30-35°C°C and a thermal breadth of 15°C from 25°C to 40°C. The similarity in their thermal performance implies that these two parasitoids should be competing strongly for their resource (host) as they target the same temperature micro-sites. The narrow thermal breath may imply a striking decrease in performance in the weaker competitor as it could be pushed towards sublethal temperatures.