Hot Cocoa in late August? Sounds at first like a total no but taste begs to differ. Made a cup this morning when it was still cool out and I could practly see the Christmas decorations. The thing with hot cocoa is that during summer you don't want it too hot or luke warm. One minute of 6floz of water in a 1200 watt microwave did the trip for me!
Oh, and the difference between hot cocoa and hot chocolate is that hot cocoa is a packet added to water because it has dried milk in it and hot chocolate you add milk to the scoopable powder found in things like NesleQuick. :P yum!

One more thing, turns out there is a way to make something called a frozen hot chocolate! Sounds good.
http://makingtheworldcuter.com/2010/08/woo-hoo-wednesday-frozen-hot-chocolate/