This aim of this study is to assess the error caused by solar radiation in real-site ambient temperature measurements obtained with a thermocouple and to determine a correction method. The results show that the high values of solar radiation that may occur in highly glazed spaces can have a significant influence on thermocouple measurements. The authors therefore decided to validate and develop a corrective model of the measurement error based on an energy balance of the sensor The influence of the various parameters was studied and the most important error was found to occur when solar fluxes were neglected. They therefore propose a simplified equation to correct the error measurement.