Urban green spaces represent an important factor in mitigating the negative environmental consequences of intensive urbanization, particularly in regulating microclimatic conditions. Their significance is most commonly observed through the mitigation of the urban heat island effect, primarily by shading heat-absorbing surfaces and driving ecohydrological processes such as evapotranspiration. However, beyond temperature-related effects, increasing attention is being given to the role of urban green spaces in regulating atmospheric humidity, an essential yet insufficiently researched microclimatic parameter. Traffic corridors represent a major source of environmental degradation in cities, where extensive asphalt surfaces intensify urban overheating. Owing to their strategic spatial positioning along these corridors, residential green spaces may play a crucial role in buffering microclimatic extremes and enhancing urban bioclimatic comfort. This study evaluates the hypothesis that residential green spaces exerts a positive impact on local air humidity, with the magnitude of this effect conditioned by vegetative cover, dendrological structure, and spatial extent. The research was conducted across five residential green spaces along high-density traffic corridors in New Belgrade. The empirical findings reveal that green spaces ranging from 0.7 to 1.4 ha consistently enrich relative air humidity by enhancing local atmospheric moisture fluxes within the urban canopy layer by 0.4% to 3.7% in their immediate surroundings. Furthermore, the magnitude of humidity regulation is strongly governed by dendrological structure and vegetation cover, rather than scaling linearly with total green space area. Ultimately, the results of this study provide practical guidelines for improving the planning, design, and management of residential green infrastructure in the context of urban climate change adaptation.