In 2018, Semmle moved to the United States to play college soccer at Barton Community College where he made seven appearances for the Cougars.[3] In 2019, he transferred to Monroe College, making 12 appearances and only conceding two goals during the entire season with the Mustangs, helping lead Monroe to its first ever NJCAA Division I Men's Soccer Championship.[4] Semmle again transferred colleges in 2020, joining Marshall University. In his junior season, Semmle played all but 45-minutes of the Thundering Herd's national title campaign, leading the NCAA with eleven shutouts while holding a 0.380 goals against average. In his three seasons at Marshall, Semmle was named Conference USA Goalkeeper of the Year, the Conference USA Golden Glove Award, First-Team All-Conference USA, 2021 United Soccer Coaches All-Southeast Region Third Team and 2021 Second Team All-Conference USA.[5]
On 15 February 2023, Semmle signed with USL Championship side Louisville City ahead of their upcoming season.[9] He made his debut for Louisville on 18 March 2023, starting in a 1–0 against Monterey Bay.[10][11] Semmle tied for the most shutouts (13) in the 2023 season (12 shutouts in regular season and 1 shutout in playoffs).[12]