Mumbai, Chennai, Delhi, Surat, Thane, Hyderabad, Patna & Bhubaneswar are projected to see twice as many heatwave days by 2030, according to a new study. Incessant and erratic rainfall will become more frequent in 80% districts. Gujarat, Rajasthan, Tamil Nadu, Odisha, Uttarakhand, Himachal Pradesh, Maharashtra, Uttar Pradesh, Meghalaya and Manipur will face heat stress & extreme rainfall together.