Hot metal is loaded from the torpedo car to the ladle, where desulfurization is realized. The main aim of the desulfurization process is to reduce the amount of sulfur in hot metal. During this process, the temperature of desulfurized hot metal is changed. The continuous measurement of this temperature during the desulfurization process is not implemented due to the device’s construction and the increasing costs. The temperature is measured only at the beginning and end of this process. For this reason, the paper focuses on the mathematical model proposal for the continuous measurement and the prediction of the desulfurized hot metal temperature. Information about this temperature will provide insight into the course of thermal processes and allow us to predict the temperature before pouring from the ladle into the oxygen converter.