Southern Lehigh was built in 1955. Before that, students in the district attended high school at Allentown High School and elementary school at Coopersburg Elementary School.
Southern Lehigh provides a variety of sports. For boys, baseball, basketball, cross county, football, golf, lacrosse, swimming, tennis, track & field, volleyball, and wrestling is provided. For girls, basketball, cross county, field hockey, football, lacrosse, tennis, softball, swimming, cheerleading, track & field, volleyball, and winter track is provided.
Southern Lehigh won the 1998 state championship in field hockey.
Southern Lehigh won the Colonial League football championship in 2013 and 2014.
Student organizations and clubs
FIRST Robotics Team
Southern Lehigh High School's First Robotics Team, the , has participated in the FIRST Robotics Competition since 2002. The Spartechs' team number is 834. The robotics team has competed at the FIRST Robotics Championship in 2016 and 2017. 
Speech and Debate Team
Southern Lehigh's speech and debate team was started in 1992 and has competed at multiple national and state tournaments.  It has recorded 5 PHSSL state champions.      The team competes in the Pennsylvania High School Speech League , the National Catholic Forensic League , and the National Speech and Debate Association competitions.