Abstract: A soil-air coupled numerical model is used in this paper to study the effects of clouds and aerosols in the atmospheric boundary layer on temperatures. Results show that the temperatures at the ground surface and in the soil decrease due to the inclusion of aerosols into the boundary layer, low-level clouds also cools the subcloud atmosphere. When clouds and aerosols both exist,the aerosol effects are not obvious. The temperature effects of clouds and aerosols depend upon both their optical thickness and characteristics and the physical properties of the underlying surfaces. When the underlying surface is desert, it is affected more than any other common bare surfaces.