3.6 billion people live in highly vulnerable areas.informal settlements are increasing 10% every year globally.Adapting to climate change is the most challenging in the most vulnerable informal settlements in India due to rapid urbanisation and migration. Informal settlements are at high risk, and it is vital to identify and address the informal settlements that are more vulnerable to the effects of climate change. In informal settlements, residents are vulnerable to climatic events with limited infrastructure housing and adaptive capacity to cope. The thesis explores the climate vulnerability of informal settlements in Hyderabad city. with a methodology to identify the most vulnerable informal settlements that are affected by heat waves.