Charging Electric Vehicles (EVs) fast and safely has a crucial role in the future of this technology. High-power Wireless Power Transfer (WPT) helps to significantly decrease the charging time. However, when the power transfer levels increase, heating-up problems occur. The thermal design of these systems needs more consideration in the design and implementation steps. This paper presents a thermal analysis of a 100 kW high-power WPT system. Finite Element Analysis (FEA) of the proposed design was performed and the thermal images of the implemented system were taken to prove the simulation results. The results show that, for high power level transfer systems a liquid cooling design is needed for long-time operations of the charging pads.