Humidity is not a friend to anyone who has hair.
Yes. If you have hair on the top of your head, humidity will always win over a great hair day.
First, the smooth locks will immediately frizz.
Second, if your hair is a little long, or short, or anything, the hair will magically shrink, curl, or give up.
Third, sweat will bead up and your hair will look as if you forgot to blowdry your locks.