You'll see two lines of discussion. One suggests that PLA is not subject to moisture problems, while another line will dispute that. I've not seen water vapor from the nozzle, using PLA, but have run into it with nylon left to the elements. With respect to printing, there are more than a few before and after images of people who have printed a model, string-city before drying and looking good after drying. These are anecdotes, of course, and not a particularly stringent test.

Florida has plenty of humidity and I attempt to dry my filament if I have advance notice for a print, but I've had good luck in both circumstances and bad luck in both as well.