West Valley High School was created in 1989 to accommodate the growing population of Hemet, California.

The student and teacher population of Hemet Junior High (closed in 1990) worked to create a name, mascot and colors (maroon and gray) for the school.

The school moved to a brand new facility on the west end of Hemet in 1996.

In 2006 the football field was upgraded to artificial turf and the originally planned pool was also completed.

West Valley High School offers the International Baccalaureate program otherwise known as "IB".