For the month, the 23-year-old ranked second in the AL in batting average, fifth in on-base percentage and second in slugging, among those with 75 plate appearances. He also led the league in doubles and posted a 1.068 OPS, good for second.
Betts also posted 11 multihit games, including five three-hit efforts.
This is the first career monthly award for Betts, who already has surpassed his career high for homers, with 22.
Cash Kruth is a reporter for MLB.com. Follow him on Twitter at @cashkruth. This story was not subject to the approval of Major League Baseball or its clubs.