Impacts of heatwaves at 1.5℃ and 2℃ in cities are substantially larger than under the present climate . In South Asia particularly, more intense heatwaves of longer durations and occurring at a higher frequency are projected with medium confidence over India  and Pakistan . At the city level, these projections could translate into significant impacts: at 1.5°℃, on average, every year Kolkata will experience heat equivalent to the 2015 record heatwaves; Karachi about once every 3.6 years; and under 2°C warming, both regions could expect such heat annually . In Pakistan, Hyderabad is likely to be the hottest city by 2100 with the highest average temperature reaching 29.9°℃  to 32ºC  followed by Jacobabad, Bahawalnagar and Bahawalpur cities . The frequency of heatwave days  will increase by 22.8, 22.3 and 26.5 d yr-1 in northern, eastern and western Japan, respectively, with megacities such as Tokyo, Osaka and Nagoya seeing large increases in HWF and related deaths .
IPCC
Climate Change 2022: Impacts, Adaptation and Vulnerability
IPCC Report