A member of the Israeli delegation to the Stoke Mandeville Games, Weiss was a gold-medal champion in javelin and shot put. Prior to the 1968 Paralympic Games he won four medals at the 1967 Stoke Mandeville Games (two silver, in shot put and javelin and two bronze, in club throw and discus) and was the national champion in shot put. At the Paralympic Games Weiss was a member of the gold-medal winning wheelchair basketball team and won three medals in athletics.