It’s impossible to characterize the weather of India, which is a huge subcontinent with ecosystems that range from the tropics to the Himalayas. Bangalore is at 3000’ above sea level, so it is considerably cooler than most of south India; we arrived during the cool part of the year, aka the monsoon season. Lots of rain, and as a result the IISc campus is awash in greenery.
During the week we have been here the weather has been extremely pleasant, highs in the 70s and lows in the 60s. It is humid, of course, because it rains every day. (Well, almost every day: yesterday was the first day it did not rain at all.) It is usually cloudy, or overcast, and strong sunlight is rare. This afternoon, when it was sunny, was the first time it seemed somewhat hot.
Of course, come March and April it does get hot here, with highs in the 90s. Although we have no A/C in the office or apartment, we have numerous ceiling fans and many windows.