Seagrass meadows are recognized for their coastal protection services in terms of reducing the wave runup level and limiting coastal erosion. This study aims to quantify these services for a dense seagrass meadow located in a non-tidal, fetch-limited sea. A year-long field campaign was conducted to collect data on wave statistics along the cross-shore direction of the seagrass meadow, bathymetry, and seagrass meadow characteristics. The seagrass meadow composed of Zostera marina, extends from approximately 6 m to 2.3 m depth and is followed by a multi-bar, gently mild sloping foreshore (1:100). A 1D-surfbeat XBeach-model was used to assess the wave transformation across the cross-shore profile and the dune erosion during a selected storm event, both with and without the seagrass meadow represented in the model. Maximum wave attenuation by the seagrass meadow reached 5%. However, this effect was diminished by depth-induced wave breaking. Consequently, the presence of the seagrass did not result in notable difference in wave runup levels or dune erosion when the seagrass meadow was excluded from the simulations.