Aiming to overcome some of well-known limitations of existing models when applied to analyse the impact of green infrastructures in urban areas, we propose the ARPS-VUC model, a new urbanized version of the APRS model, applicable from neighbourhood to city scales. It results from the integration of the Vegetated Urban Canopy (VUC) model in the ARPS meteorological code. The novelty is the integration of an intermediate multilayer canopy modelling approach, where meteorological fields are solved within and above the canopy, and the canopy elements (building and high vegetation) are represented through a drag force approach. The ARPS-VUC model is also able to account for buildings’ green roofs and/or walls. This work presents the first use of ARPS-VUC model to evaluate the impact of vegetation on the local microclimate of an idealized homogeneous urban canopy. To that purpose, we defined different canopy configurations, with different types of vegetation devices (small and high vegetation, green facades and roofs). Complete diurnal cycles were simulated for meteorological conditions corresponding to a sunny summer day and results obtained for each configuration were compared. Generally, the results show that vegetation cooling effects change in amplitude and during the day according to the type of vegetation device. When analysed individually, trees induce a larger air cooling, especially in the bottom part of the canopy, than small vegetation (ground level and/or building wall/roof surfaces), due to the tree shading effect along the daytime period. On the other hand, green buildings impact is also visible after midday and at night. The main cooling impact is observed when high vegetation is associated with vegetation on buildings. These first results are in agreement with recent studies and show that greening urban areas can be, in fact, an efficient way to regulate air temperature, particularly at the pedestrian level for both day and night. They further demonstrate the potentiality of our model to evaluate the impact of vegetation on local microclimate.< Réduire