where i live, in israel, it's hot all summer long. verrry hot. the past week was in the 40s-C which is in the 100s-F. so very very hot. and strong sun. and luckily- dress code is more casual so we wear sandals (no socks/stockings), light airy skirts/slacks, and 100% cotton tops/tanks. OTOH - the office i work in is freeezing (the a/c has an on/off button only, no thermostat, and luckily roomate and i both like it very cold so that's how we beat the heat).
I walk all/part of the way to work, so i get there already hot and sweaty. so i drink cold water, and make my first cup of coffee as a cold coffee to cool me down. after that i stick to freezing water and hot coffee.
last night, i sprinkled my bed (sheet/pillows) with freezing cold water - it was very nice! it lasted only a few minutes but really cooled me down