This paper investigates the impacts of external shadings on the convective heat transfer rate of a high-rise building. The convective heat transfer coefficient (CHTC) is evaluated using high-resolution 3D computational fluid dynamics simulations. Thus, as the depth of the shading element increases, reduced values of CHTC were obtained. Except at the horizontal edges of the building locally for horizontal shading elements, and at roof level edges for vertical shading elements. For example, for 1 m deep shading element, CHTC value decreased compared to smooth surface by 13%, 22%, and 46% for a horizontal, a vertical, and an egg-crate forms, respectively.