A couple of years removed from being a key piece in the Paul Goldschmidt trade, Weaver entered the season in the bullpen and immediately continued his familiar stay on the IL, pitching only 2/3IP in April before elbow inflammation caused his most recent stay. He stayed there until the middle of June, when he came off the IL and pitched in 3 June games, allowing 12 runs across 7.2 innings.
After that he was exclusively used in low leverage and single-inning situations and performed well, pitching 8 innings and allowing a single run across 8 July appearances before being dealt to the Royals in exchange for Emmanuel Rivera.