Does Xur always spawn in the tower?
He appears only on weekends between 5 AM EST on Friday to 5 AM EST Sunday, either in the Tower or the Reef. Xur's location is constantly changing within those two place, and for a guardian on the go such as yourself, that can be a challenge.
You can find him in the Tower over in the Hangar. Run to the right side of the map and run under the building housing Future War Cult. Head to the northern edge of the map and run up the flight of stairs there. You'll find Xur hanging out right at the top of that first staircase, next to the next flight of stairs.
Xur appears every Friday at 10am PDT / 1pm EDT / 6pm BST and will stick around until Tuesday's Destiny 2 weekly reset. The reset takes place on Tuesdays at 10am PDT / 1pm EDT / 6pm BST.
After being freed from Orin's grasp, he reaches into his robes to reveal a silver jar—misinterpreting Xûr's movements as a sign of hostility, Orin struck the Agent in the chest with her war hammer, sending him flying and breaking his spine. Though Xûr survived, he acquired a permanent hunched posture due to his injury.
Do note, Xur will spawn on a random location that changes each week. Like his arrival time, Xur will also leave the game every Tuesday at 6 PM BST /10 AM PT/1 PM ET, which incidentally is the exact same time as the Destiny 2 Weekly Reset.
Players discovered they could sit by Xur, which prevents him from leaving, causing his inventory to refresh – effectively holding him hostage for weapons as random.
Xur arrives in Destiny 2 every Friday at 10 a.m. PDT.
Each week, Xûr has a random assortment of Exotic armor, one for each Guardian class, as well as a random Exotic Weapon and an Exotic Engram available for purchase. In addition to his Exotic wares, he's got a random collection of Legendary weapons and armor to deck out your Guardians.
If you're new to the game, Xur is a character that sells exotic weapons and armour over the weekend. He appears at 5pm GMT (6 PM BST) in a seemingly random location and offers rare gear in exchange for legendary shards that you can collect from dismantling legendary gear or completing activities.
The Tower: Hanger
Xur can appear in the Tower hanger on the right side of the map.