Pelabuhanratu Bay, the largest bay on Java’s southern coast, is characterized by dynamic sediment transport influenced by seasonal precipitation and hydrodynamic forces. This study analyzed the variability of Total Suspended Solids (TSS) from 2015 to 2019 using Landsat-8 OLI imagery calibrated against in situ measurements. The regression model between satellite-derived and ground-truth TSS showed strong agreement (R² > 0.70), validating the use of remote sensing for coastal monitoring. Results indicate that TSS concentrations peaked during Transition Season II, with a mean of 57.94 mg/L, despite the highest rainfall occurring in the Northwest Monsoon. This suggests that sediment resuspension driven by tidal currents and wind plays a significant role. Station 6, located near a river mouth, recorded the highest TSS (85 mg/L), whereas Station 7, situated in a more sheltered zone, exhibited the lowest levels due to natural filtration. The five-year analysis revealed increasing TSS trends at several sites, underscoring the compounded effects of climate variability and human activities. Cloud cover constraints during peak rainy seasons highlight the need for integrated monitoring strategies combining remote sensing, hydrodynamic modeling, and field validation. These findings provide critical insight into managing sedimentation and preserving water quality in monsoon-influenced estuarine systems.