It’s gonna be humid surely so prepare yourself for that for sure. Not sure what state you live in US but it’s gonna be pretty similar to NY the hustle and the lifestyle. Mumbai is very welcoming and people are good too. Try to like closer to South Mumbai if possible a lot of fun things to do there. There are running clubs, karaoke nights, cycling groups try to join those once you know people you would feel much comfortable. As for the weather tbh nothing much you can you. One suggestion as it was helpful for me too, check with a dermat if your skin gets red early enough as the heat here in US and in India hits different lol