Watson received a 27-game suspension without pay from the league last month after pleading no contest to a misdemeanour domestic assault charge in July.
''We are aware of its reduction to 18 games,'' said the Predators in a statement. ''As previously stated, our focus has and will continue to be the health and well-being of Austin and his family.''
The 6-foot-4 forward will be allowed to rejoin the team for their Nov. 15 game at Arizona.
The charge involved an incident that occurred in June with Watson's girlfriend. The prosecutor said the woman had asked for a dismissal of the case, but prosecutors proceeded because there were witnesses.
Watson, 26, was arrested June 16 by police in Franklin, Tenn. Police said he assaulted his girlfriend, who gave birth to their child in April. Police said the two argued at a gas station and he admitted to pushing the woman.
As a result of the plea in Williamson County General Sessions court, Watson received three months of probation and is required to complete a 26-week batterer prevention course. If he violates probation, he could spend up to one year in jail. If he abides by all stipulations, the charge will be expunged from his record.
Watson was a first-round pick of the Predators in the 2010 draft and signed a three-year, $3.3 million contract a year ago. He scored a career-high 14 goals in the 2017-18 season.
(With inputs from agencies.)