Innovative research in the use of concrete has made it one of the most commonly used materials in the construction industry globally, with about 25 billion tons consumed annually. The durability of concrete is strongly dependent on the interactions of its constituent materials with the environment, and determines its performance during the service life. Reinforced concrete (RC) structures in marine environments are subjected to chloride-laden exposure conditions which affect their durability. This paper reports on an investigative study that seeks to understand the influence of climatic conditions such as temperature, relative humidity, precipitation and wind speed etc. on the exposure of RC structures to airborne chloride deposition and ingress. The focus of the study is the marine environment of the Cape Peninsula in South Africa. The study showed that the durability of a RC structure is location-specific, and the microclimate of the location influences the severity of exposure.