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Understanding the relationship between population dynamics and vulnerability to climate change is critical for developing more targeted and effective adaptation policies and actions. The effects of an increased frequency and intensity of climatic hazards is magnified in urban centres that are experiencing rapid growth. Semarang, a city located in Central Java, Indonesia, is one such location. The city has historically faced hazards such as drought, land subsidence, landslides and floods, many of which are likely to become more severe and frequent as a result of climate change. The demographic and spatial analysis presented in this Technical Briefing, and in the full report from which it is derived, indicates areas in which exposure to climate-related hazards coincides with social and demographic characteristics that exacerbate vulnerability. This information can be used to target policies and initiatives toward reducing the impacts of climate change more effectively.