Our mysterious friend appears once a week in a series of pre-determined locations, and in this guide, we'll show how to find him on Nessus.
For his other locations, be sure to check out where to find him in Winding Cove in the EDZ, or in the Hangar in the Tower, which are the other two locations he can appear (at least as of the time of writing).
Destiny 2 Xur Nessus Location: Where To Find Xur In Watcher's Grave
When you open the Nessus on your Director menu, look to the top of the region for 'Watcher's Grave'.
Select the landing zone there and head north when you land.
You'll see a huge, red tree, and be able to climb it (approach from the north to find the slope).
Once you're up there, you'll find Xur and can interact with him.
For more on Xur, including where he is and what he's selling, check out our guide here.