NOTHING is hotter than sliding on asphalt! My wife wears Fieldsheer 4 seasons armored mesh overpants over whatever she desires (I require the armor - what goes under is her option). Shorts work in humid weather, but not hot dry when it is over ~90F. Light hiking pants (sporting goods stores) are great for summer as they have zip-off legs to convert to shorts. They are usually a fabric that dries quick if you get caught in a downpour.