Wave and wind impacts on long-term backshore profile variations were evaluated through field observations of daily beach profile and wave, tide, and wind conditions at an open-ocean dissipative beach in Japan from 1988 to 1997. Indices of wave and wind impacts were defined by wave run-up level and wind-driven sand transport rate, respectively. The results show that long-term beach profile variation was related to wave run-up rate defined by the fraction of time that the wave run-up level exceeds the bed elevation. The wave impact on backshore profile could not be ignored where the wave run-up rate was larger than 0.4%. Wave-induced accretion during extreme event due to low pressure system is a significant factor of the backshore sedimentation.