Sonny Weems played basketball at West Memphis High School where he was named first team all-state as a senior after leading his team to the 5A state championship, and was also a 6-10 high jumper in track and field. In Weems' high school career, West Memphis posted a record of 68-10. Weems averaged over 20 points per game as sophomore and junior, and 14.0 rebounds per game as a senior.

After high school, Weems attended junior college at the University of Arkansas-Fort Smith, and was named 3rd team All-American, as well as all-conference and all-region as a freshman. Ranked as the number one junior college player in the nation by Rivals.com and Street & Smith's, Weems took UAFS to the National Junior College Athletic Association (NJCAA) National Championship in 2006. Weems was named honorable mention All-American and was selected for the all-tournament team. In two years at UAFS, Weems led the team to a 62-7 record and back-to-back Bi-State Conference Eastern Division titles.