This work is devoted to the study of the distribution of temperature fields during friction stir spot welding (FSSW) of 2 mm thick aluminum sheets made of Al5Mg and V95AT using computer modeling. The model was created in the DEFORM-2D/3D software package for modeling metal forming processes. As a result of the work, a FSSW process model was created for aluminum alloys Al5Mg and V95AT, which was verified using experimental temperature measurement data using thermocouples. Using a verified model, the influence of process parameters on the temperature fields of aluminum alloys was studied. The results of the study showed that the main influence on the temperature increase during FSSW is the rotation speed of the tool, as well as the thermal conductivity of the material itself. The complication of the shoulder geometry, in particular the application of threads, additionally increases heat generation and the abrupt behavior of the temperature.