The wettability of tool materials used for polymer processing is often determined at room temperature. However, it has to be considered that polymeric materials are processed at higher temperatures. Contact angle measurements of polymer melts on tool materials at different temperatures were performed in this work using a KRUESS Drop Shape Analyzer DSA30S with a high temperature chamber. The contact angle of a polypropylene (PP), a high density polyethylene (HDPE), a polymethylmethacrylate (PMMA) and a polyamide 6.6 (PA 6.6) melt was determined on different solid samples at varied close-to-process temperatures. The solid samples were polished and ground steel as well as TiAlN-, TiN-, DLC-, CrN- and PTFE-coated steel. The polymer sample was placed on the hot tool material sample in the high temperature chamber under a nitrogen gas atmosphere. After melting of the polymer, the drop shape was recorded dependent on time using a camera system. PP, HDPE and PMMA show a decrease in the contact angle with time. PA 6 exhibits a static contact angle. The results show a linear decrease in the contact angle of the polymer melts with higher temperature on the different tool materials. The surface tension of a liquid decreases linearly with higher temperature according to the equation of Eötvös. Young’s equation describes the contact angle dependent on the surface energy of the solid, the surface energy between the liquid and the solid and the surface tension of the liquid. The decrease in the contact angle of the polymer melts can be explained by combining both equations. Dependent on the polymeric material and the tool surface, the intensity of the temperature influence on the contact angle is different. There is a steeper decrease in the contact angle of the polymer melts on steel and TiN compared to PTFE. This can be related to the lower surface energy of PTFE compared to the other tool materials.