They will get much hotter than 80°F when in use, the average AIR temp in a computer in use is 100°F.
Unless they are in the sun the temp wouldn't be any hotter in the cases as there is nothing in the cases generating heat. Probably actually cooler in there. No worries about that temp at all they can probably take double that while stored. You can look up their data sheet for manufacturer stated limits if you really feel like it.