The article presents a developed simulator program, created in the Scilab software environment, for the automated calculation of the cutting temperature, the basis of which was the natural thermocouple method. The proposed model for calculating the cutting temperature for different materials and process conditions considers the influence of the physical basis of the cutting processes of material processing. An algorithm for calculating this value was developed to obtain a graph of the temperature change during the cutting process depending on the processing modes, the diameter of the part, and the “processing material – tool material” pair. The change in the position of the current point on the graph relative to the theoretical value of the cutting temperature, due to the influence of physical processes, is realized by the introduction of random fluctuations superimposed on the surface profile, which are produced by a random number generator according to the law of normal probability distribution. The method of processing the array of coordinates of profile points to obtain the measured value of the cutting temperature was described. The program has implemented the possibility of constructing three-dimensional and two-dimensional graphs of the dependence of the cutting temperature on the cutting and feed speeds, which can be used to study the effect of processing modes on the cutting temperature depending on the combination of “processing material – tool material”.