I worked in Chennai for 4 months. I was finally able to demonstrate to my kids how hot it was there yesterday (kids, it was like this, all day and all night. In January).
This. The Vic line trains - and Green Park station in particular - are like an oven when it's 21 degrees outside. And the Central line is even worse.
I did a month (Feb) and agree, it was 33-35 in the day and a mere 28-29 at night.
I tried keeping my hotel room at 25 . . . cool enough to sleep but warm enough to acclimatise. I'd still sweat and fade withing 30s of stepping outside in the morning!
I was working in a big steelwork factory, office had AC but the shop floor . . .wowzers. unbearable. every day we'd get back to the hotel and room service had turnd the AC down to 16 . . . . had to wear a jumper in the club it was so cold!