The coastal zone is characterized by having a certain fragility due to its complex environmental dynamics, which is directly corresponding to the interaction of continental and marine agents that, not always, act in balance. Thus, an intense human occupation in coastal regions, often in a disorderly way, has intensified this imbalance, generating consequences and impacts, usually negative, to the coastal environment and a population that inhabits the seashore. In this context, the present work comprises the carrying out of continuous monitoring for the stretch of coast between Atafona and Grussaí, examination in São João da Barra, Rio do Janeiro s north coast, through the projection of future behavior scenarios. coastline, for the temporality of 5, 10, 15, 20, 25 and 30 years, based on the behavior trend of each fixed point observed through the dynamics mapped in the last 68 years. The results found for future scenarios show the displacement of the coastline at an average speed of -2.78 m/year in the region affected by the erosion process and +2.51 m/year where the progradation process occurs. Keeping the currently outlined dynamics, the future scenario for +30 years points out that the region close to the Atafona point will continue to be the most affected by the erosion dynamics, where the highest linear rate found is -161.10m from the current line of coastline in the region, while at Grussaí beach, the progressive process will have added +127.10m to the current coastline.