I hunt in NY and sometimes it'svery cold and I too sweat walking to my stands. On cold days I have to bundle up in many layers(Can't carry all of them)and walk carrying daypack, treestand, and bow. Half the time I am drenched in sweat, then settle in and start to freeze to the point of hypothermia! I guess the grass always looks greener on the other side.
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How fast do you walk to your stand? I know, 90 degrees is very hot and you'll still work up a sweat but maybe if you slow your speed down going to the stand you might not work up as great of a sweat. Kind of depends on how far you walk to your stand too and how early of a start you get in the mornings. This past weekend here in Illinois it was around 86 degrees and I hunted behind my house....only about 150 yds. and I worked up one helluva sweat....and I was taking my time.