I’m surprised no one has mentioned a towel to carry around. I know that many Japanese people use a towel to pat their face when it’s very humid. I’d say aircon when you’re home but it can really use up a lot of electricity. Dehumidifier for sure but I think having the face towels handy really helped with the sweat that would drip down my face, especially when riding a bike. You can find all kinds of towels pretty much anywhere. I think I bought some at 7/11 or conbini, also drugstores. My parents came to visit and bought a bunch of towels because they were sweating and they thought that was the most efficient. Also, a fan! They are for free at some places during the summer. I have horrible acne so the towel was perfect!