User blog comment:El Asesino/Werewolves...Where are they/@comment-9548103-20130412155256

Honestly, improve the grammar. But outside of that, they're added as a RANDOM ENCOUNTER. They're most commonly found at night. You have to wait it out, and do some adventuring in Skyrim, and using Auriel's Bow seems to increase the chances of nighttine encounters, inclusing the Werewolf.