Urban flooding in Makassar City is influenced by rainfall variability, urban development, and limited landscape capacity to regulate stormwater. This study applied a Pressure–Sensitivity–Adaptive Capacity (PSAC) framework to spatially assess the interaction between hydrological pressure, flood susceptibility, and landscape adaptive capacity. A descriptive quantitative approach was employed using secondary rainfall data for 2015–2024 from the Indonesian Meteorological, Climatological and Geophysical Agency (BMKG), official flood-susceptibility data from the Regional Disaster Management Agency (BPBD), spatial planning information, and Green Open Space (GOS) data. Rainfall dynamics were evaluated using annual and seasonal precipitation, wet-month frequency, and variability indicators, while flood susceptibility and GOS distribution were assessed through GIS-based spatial analysis. The results showed substantial rainfall variability during the study period, with monthly precipitation ranging from 42.7 to 612.4 mm and a coefficient of variation of 48.1%. High and very high flood-hazard classes covered 34.8% of the study area, while GOS accounted for only 12.42% of the urban area, below the 30% spatial planning benchmark. Furthermore, 41.2% of exposed assets were located within high and very high flood-hazard zones. The PSAC priority areas showed 78.6% spatial overlap with moderate-to-high BPBD flood-susceptibility zones, indicating substantial spatial consistency with the institutional reference dataset. The study demonstrates that integrating dynamic rainfall pressure, urban sensitivity, and landscape adaptive capacity provides a more comprehensive spatial basis for prioritizing flood adaptation and blue–green infrastructure interventions in tropical coastal cities.