The Nationals reinstated Weems (lower leg) from the 15-day injured list Saturday, Spencer Nusbaum of The Washington Post reports.
Weems landed on the IL on July 26 due to shin splints in his right leg. He didn't end up needing a rehab stint, and the 31-year-old right-hander will return to the Nationals' bullpen for their weekend series against the Angels. Right-hander Joan Adon was optioned to Triple-A Rochester in a corresponding move.