Weaver attended the University of San Francisco where he played on the men's soccer team from 1993 to 1996.
In 1997, he turned professional with the San Francisco Bay Seals of the USISL.
[1] On February 1, 1998, the San Jose Clash selected Weaver within the first round (third overall) of the 1998 MLS Supplemental Draft.
[2] In July 1998, Weaver had his right leg broken by a bad tackle in a friendly with Monarcas Morelia.
[4] Weaver was recalled by the San Jose Earthquakes in 2002 for 3 games during the World Cup to replace Jeff Agoos.