Linked to the dense occupation of these areas, it is identified that part of its features that naturally protect the coastline are recurrently suppressed from the landscape, giving way to rigid engineering works that begin to occupy the dynamic profile of the beaches. With that, in cases of storm events, the beaches become susceptible to wave action, as well as the population that inhabits the seaside. In this sense, the present work aims to seasonally characterize the morphodynamic and sedimentary behavior of the coast located between Leblon and Arpoador and its susceptibility to the effects of storm surges, providing subsidies for the management of the coast. To obtain the data, 32 topographic beach profiles were acquired between 2018- 2021, using the Emery method; beach sand analyzes (granulometry and morphoscopy); morphoscopic analysis; calculations of the emerged volume of sediments and survey of storm surge alerts issued by the Brazilian Navy and other media outlets. The ends of the beach (points LB01 and AR01) showed greater morphological variability and variation in beach width in beach width.; point LB02 (close to the Jardim de Alah channel) is the most susceptible to storm waves; and point IP01 (located in the middle of the arc), is considered the most stable due to the presence of islands in front of it. Emerged sediments from the coast exhibited a seasonality marked by accumulation in summer and subsequent loss in winter. The role of waves is essential in the dynamics of the beach arc, with predominant incidence from the Southwest (storm) and Southeast (clear weather), which enables the formation of longshore drift currents that are important in the rotational East-West distribution of sediments in the beach arc. It is concluded that the Leblon-Arpoador coast presents a certain dynamic balance, since the topographic profiles show great variability in width and such dynamics can be corroborated by the relationship between gain and loss in the volume of sediments in the arch. Medium sand is predominant, but a distinct distribution of grains can be seen in the coast: medium to coarse sand was observed in the western portion (Leblon) and medium to fine sand in the eastern portion (Arpoador). The sedimentary distribution is also different in terms of degree of roundness (in the backshore the grains are subrounded and in the beach face they are subangular), grain selection and maturity.