Cancun doesn't really get that sweltering hot in the summer. It's moderated by the ocean breeze (in the city away from the ocean it can feel hot). South Texas/Alabama/LA can be much hotter. Normally in late June/early July the warmer days are 90-92 F and the cooler days are in the lower 80s. Nights are about 10 degrees cooler. Often times we wish it was warmer as the pools can be chilly after a rainy day or two. A few years ago in late June the breeze on the beach was kind of cool. Never been there in August, might be a degree or two warmer. Been going every summer for 14 years, I think the hottest we ever saw was around 92/93.
