This paper presents an experimental verification of a coupled simulation model originating from EnviBatE (microclimate tool) and the urban building energy model (UBEM) Dimosim. Based on synchronous coupling techniques, the microclimate model considers detailed solar radiations and airflow calculations as well as a zonal model for discretized canopy air nodes and building nodes. A reduced-scale experimental mock-up provides the possibility to carry out the evaluation of the tool against on-site measurements. The mock-up consists of five rows of empty concrete blocks on a 1:10 scale with an aspect ratio of 1.2. For calibration and validation purposes, we collected measurements of surface and air temperatures, incident solar radiation and incident longwave radiation coming from the sky. Then, we compare outdoor and indoor temperature of the experimental mock-up and the numerical model for a monitoring period of 26 days. The analysis highlights the capabilities of the coupled model to represent the urban canyon effects. This study allows quantifying the effects of reflective coatings in order to reduce local overheating on a neighborhood scale.