Nunnally attended Weston Ranch High School in Stockton, California. As a sophomore, he averaged 10 points and 8.4 rebounds per game. As a junior, he averaged 19 points, 6.5 rebounds and 3.5 assists per game as he was named Stockton Record Player of the Year, All-State, All-CIF Sac-Joaquin Section and All-Valley Oak League.
