Humidity? I got humidity for you. Pensacola in August, working outside in Tyvec with taped up ankles and wrists. Or in the South Pacific under the same circumstance. You need to stay hydrated and pace yourself pure and simple. Start out slow and ease into it and your system will adapt over weeks. Note weeks and not days. I can remember my first week on Guam and I'm in this open air bar in the shade sipping something cold dripping sweat and inside my head screaming "get me out of here!". Six months later I'm working 10 to 12 hour days completely sealed up and swimming in sweat no problem. When I got back to San Diego, however, my skin would itch like crazy for 2 weeks and I couldn't wait to get back. Dang haole skin! drove me nuts. If you give it time, you will adapt.