In drilling, temperature is an important factor for the tool and the machining performance. For this reason, analysis of the temperature in the cutting zone is essential for predicting the machining performance. In this study, commonly used AISI H13 and AISI D2 steels were drilled using uncoated and (AlCrN monolayer) coated carbide drills of 14 mm diameter on a vertical machining centre. The cutting zone temperatures were determined using the thermocouples inserted into the coolant holes of the drills. The tests were carried out at four different cutting speeds (60, 75, 90 and 108 m/min) and three different feed rates (0.15, 0.20 and 0.25 mm/rev). The experimental results showed that increasing feed rate and cutting speed led to decrease in the temperature. The lower heat conduction of the coated drills resulted in the higher temperature. In all the tests, drilling of AISI H13 caused higher temperature than that of AISI D2. It is considered that this was caused by the structural and chemical differences of the materials.