Gregory's ServerGood points.
I live in a part of the US where the temperature (Fahrenheit) and humidity both hover in the mid ‘90s this time of year.
If you do have to be out in the heat of the day in full sun, a neck gaiter (buff) is a must. Wet it down to help keep your core cool as well as keep your neck from frying. You’d be amazed at how fast your neck and shoulders can get sunburned compared to everywhere else.