Climate change and variability are among the most critical threats facing heritage sites across the world. However, despite the threats posed by climate change and variability on heritage tourism sites, there are limited research and management interventions to help build the resilience of threatened sites. South African national parks are home to numerous heritage sites, including unique ecosystems, prehistoric ruins and rock art, which are still undocumented. This research assesses the risks imposed by climate change and variability on heritage sites within selected South African national parks. Assessing and prioritising risk is important to designing effective conservation and preservation strategies. The participatory Climate Vulnerability Index was used to assess climate vulnerability on three heritage sites within Kruger, Mapungubwe and Table Mountain national parks. The research developed and used a seven scale semi-quantitative risk analysis tool to rank and prioritise the identified climate related threats. Survey questionnaires were administered to park visitors to assess their perceptions of climate change impacts on heritage sites. Discussions with key informants were also done using in-depth interviews and focus groups. The results show that the vulnerability of heritage sites to climate change was high at all sites. Warming temperatures, drought and flooding intense rainfall are the main climatic stressors. A SMART (Specific, Measurable, Achievable, Realistic, and Timely) action list for the identified critical climate related risks was developed. To build future resilience, the paper recommends changes in how threatened tourism heritage sites are presented to visitors, improved funding for the documentation of the impacts of climate change on the heritage sites and developing anticipatory action to manage potential impacts.