In this work, a detailed investigation is conducted on the influence of temperature on the performances of electrical machines operating under high-temperature conditions. The analysis is carried out on a synchronous reluctance motors (SyRM) using advanced magneto-thermal modeling, which accurately considers the influence of temperature on the electromagnetic and thermal behaviors of the machine. The strategy integrates both the magnetic non-linearity and the temperature-dependency of the electromagnetic and thermal properties of the materials. The numerical modeling is coupled to the circuit equations to consider voltage power supplies. The results highlight the efficacy and the performances of the developed electromagneto-thermal modeling approach.