Hi @nathanu . I'm in Maryland, and, believe it or not, the humidity here rivals that of Florida. There are many days that our weather forecasts make that comparison and frequently remark that we are hotter/more humid here than in Florida or Louisiana. In fact, this last 5 days it has been over 90 F, with dewpoints around 75. M-U-G-G-Y
In the summer, I wear my buff as a doo-rag (no need to soak it beforehand, sweat will do that in no time). I wear lightweight breathable and quick-drying shorts, like Outdoor Research Ferrosi, Patagonia Quandary or Eddie Bauer (sorry REI) Guide Pro, and lightweight shirts like Outdoor Research Echo, Patagonia Capilene Cool, or REI Sahara. I have different, lightweight hiking boots for summer. I agree completely with @Dad_Aint_Hip about sock liners. Game Changers!
And, whether I plan on it intentionally or not, the heat and humidity tend to force a slower pace. I carry extra water in a hydration bladder which I fill with ice. Not only does that taste better, it acts like a mini air conditioner against my back. And, since we are blessed with an abundance of waterways, I never miss the opportunity for a quick dip, or at least a wade, through one of them along the trail.
Stay cool out there!
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