Climate change exacerbates coastal threats, increases the frequency of intense events, and worsens flood management. According to Staddon, Urban Green infrastructures (UGIs) plays an important role in urban resilience (Staddon et al. 2018). Turkey’s escalating climate crisis is causing increased erosion and flooding, particularly impacting coastal cities like Istanbul. This study aims to evaluate the UGI and hydrological patterns of the Kadikoy coastal district to enhance urban resiliency by using the Urban Atlas 2018 Land Use Land Cover (LULC), Normalized Difference Vegetation Index (NDVI) for UGIs, and Normalized Difference Water Index (NDWI) for hydrological patterns that are driven from Sentinel-2 L2A in ArcGIS Pro as Landsat’s Digital Elevation Model (DEM) were integrated for more accurate flood susceptibility mapping. The DEM was used to find surface runoff water routes. The range of NDVI values in 2018 is between 0.998585 and -0.524972, compared with 2023 values of between 0.771447 and -0.610807. Accordingly, from 2018 to 2023, there was a nearly 40% decrease in the amount of healthy vegetation and a nearly 31% increase in imperviousness. The NDWI range in 2018 is between a high of 0.493074 and a low of -0.865185, compared with 2023 values of between a high of 0.43937 and a low of -0.77354. Accordingly, a comparison of the NDWI values between 2018 and 2023 reveals an increase in urban surface water, especially in the vicinity of major streams such as Kurbagalıdere. Fikirtepe, located in the northern part of Kadikoy, is facing mega changes in land use. The absence of decarbonized architecture and climate-friendly design strategies, expected to be integrated into urban transformation projects, brings about problematic LULC changes. This study reveals four major types of vegetation loss in the study area: the main NDVI hub of decrease due to monobloc LULC changes handles the first type. In contrast, the second one is related to the coalescence of climate and land cover change and stands as the loss around main streams. The last two types occur under the impact of urban stress but not any physical change. They are examined as the ones within the urban fabric – existing UGI nodes and the linear decrease around the main roads. Consequently, regarding ones developed under the impact of urban stress and climate change, this study proposed that the existing urban green infrastructure components should be upgraded by introducing new climate responsive vegetation layers. For further studies, data with a higher spatial-temporal resolution covering 2006–2023 is expected, as there is a major LULC change in the study area.