The phenomenon of climate change causes cities in coastal areas to be threatened by rising sea levels. Semarang is one of the coastal cities in Indonesia which is threatened by sea level rise. One of the consequences is tidal flooding in coastal areas of Semarang. Semarang as an old city has a cultural heritage area with historic buildings. The purpose of this paper is to analyze the current condition of the Semarang Old City National Cultural Heritage Area and the impact experienced by the tidal flood. The method used in this research is to conduct a literature study and field observations which are analyzed by spatial analysis of buildings in historical areas and descriptive analysis. This study shows that tidal flooding is a threat to cultural heritage buildings. The condition of the land in the city of Semarang, which is decreasing due to land subsidence and rising sea levels, has made the potential for damage to buildings in the old city area even greater.