Permeable pavements possibly offer a dual solution to climate change challenges in increasingly urbanized areas. They mitigate flooding by absorbing moisture and they combat the urban heat island effect by promoting moisture evaporation, thus lowering surface temperatures. However, practical implementation has been hindered by a lack of comprehensive research. This study investigates the influence of material properties and top layer thickness on rainwater runoff and surface temperature through hygrothermal simulations, focusing exclusively on these factors for brevity. Examining material properties using the Van Genuchten – Mualem expressions reveals the key parameters affecting runoff and temperature. Capillary moisture content and capillary permeability significantly impact both outcomes. Moreover, a weaker correlation between mean pore radius and rainwater runoff is identified. Additionally, varying top layer thickness demonstrates its role in reducing runoff and surface temperature. The study also considers different climates, confirming the general validity of the findings. Ultimately, this research provides valuable insights into the efficacy of permeable pavements in mitigating flooding and the urban heat island effect, offering guidance for their practical application.