Weathers threw a 30-pitch bullpen session Friday and is scheduled to throw another Monday, Christina De Nicola of MLB.com reports.
Weathers has been on the shelf since June 8 due to a left index finger strain but has been making significant progress in August. Friday's bullpen was Weathers' first mound work since sustaining the injury though, and he shouldn't be expected back with the Marlins until September. How the team handles his rehab should indicate whether he's ticketed for a return to the rotation or will pitch out of the bullpen upon his activation from the IL.