In this study a simplified approach for urban microclimate modelling by using TRNSYS 17 software has been developed and validated. This approach has the advantage to model the microclimatic phenomena in order to consider them in a dynamic building thermal simulation software without going through time-consuming CFD calculations, and with a satisfactory accuracy for thermal and energy evaluation. This approach is used to determine the microclimate impact on Riad’s thermal behavior. The obtained results show that the estimated energy performances of Riad by only dynamic thermal simulation tools are deviating in relation to the developed approach.