Mauro Rosales and Obafemi Martins also each notched goals for Seattle (3-3-4).
The Sounders have gone 3-0-2 in their last five games, pulling to within two points of a playoff position in the Western Conference.
San Jose (3-4-6), meanwhile, has recorded just one victory in eight contests.
Millions of Getty images now available for free via embed tool
Boston schools pull out free condoms over wrapping complaints