This study introduces a numerical investigation on the impact of different inflow atmospheric conditions on the wind turbine wakes. The effects of the inflow turbulence intensity and wind speed under thermally-stratified atmospheric boundary layer (ABL) are presented and discussed. The steady state three dimensional Reynolds-Averaged Navier–Stokes (RANS) equations are solved in the simulation, along with the Actuator Disk Method (ADM) for the turbine rotor modeling. A modified 𝑘-𝜀 model, namely El Kasmi model, is adopted for the turbulence modulation. Further, an additional source term is added to the turbulence equations, to artificially represent the buoyancy generated turbulence, without the need to solve the energy equation. It is found that, there is a considerable effect of the different atmospheric flow properties on the wake flow behavior. Particularly, as the turbulence intensity increases, the wake recovers faster and hence, the wake deficit decreases and the available wind power in the wake region increases. Further, the wake deficits values immediately downstream the turbine are higher for the lower inflow wind speeds.