I have to agree! As a transplanted Marylander in the Texas summer oven, I've tried all the tricks. So far the best I've found is to adapt the clothing for hot sunny weather. Magellen is your friend. I wear Magellan fishing shirts a bit too big. Nice very light weight vented material that when wet, dries in a few minutes if you stand in the shade with only a bit of breeze. Magellan shorts, made of the same material as the shirts, helps. Again, a bit oversize for that slightly loose, baggy fit. Key is very light material that breaths well and dries fast. A nice straw hat with wide brim for sun shelter for your head is good. Keep the sun off you and you've won half the battle. If I use any water, its just to take the water bottle and dribble a bit down my back under the shirt. Breeze comes through the shirt and felt cool.
And find lots of good books to read at the library.