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India is experiencing an alarming escalation in extreme heat events, with record-breaking temperatures and prolonged heatwaves posing significant challenges to public health, infrastructure, and economic stability. In recent years, the country has witnessed some of its highest recorded temperatures.

This report provides city-specific Heat Index (HI) forecasts until June 15, 2025, offering a valuable resource for policymakers, urban planners, public health officials, educators, industry leaders, and communities. The report is structured to enhance understanding of heatwaves and their far-reaching impacts. It begins with an overview of heatwaves and their effects on human health, followed by an examination of the Heat Index as a critical tool for assessing heat stress. A comprehensive forecast of the HI across major Indian cities is presented.