I moved to Korea and every year June, July and August I’m incapable to be outside because of the humidity. On the way to the convenience shop my underwear is already sweaty.
So I stay either in the office or at home running the AC all the time which doesn’t help with fighting the climate change.
Used to live in Singapore and my recommendations are to use thin Uniqlo Airism tees or tank tops underneath your tee or shirt. Plan your routes so you know where to find aircon or fans, always walk slowly and make sure to hydrate. There are also body sheets that you can use to freshen up.