2. Bangkok (Thailand)
In this case, this is not desert heat, but tropical heat with temperatures above 35ºC for much of the year.
That might not sound very hot, but it is, and here are the reasons why. The first is the typical humidity - almost 100% on many days of the year - of a tropical monsoon climate. During the monsoon season it rains non-stop for more than 20 days a month.
The second is that temperatures barely drop at night and, the third, the effect of man. In a city with more than 5 million inhabitants and extremely heavy traffic, the effect is suffocating. Anyone who lives or visits this city should wear cool clothing to be able to stand the extreme heat.