Never been there myself, understand they can have excellent strong winds and nice Pacific swells to go with. In late October, I would assume some strong frontal related winds would be on periodically. Not sure about air/water temperature and exposure clothing req's. It might be coming near the end of the "normal" wind season, varying from rider to rider of course. If the strong winds are on, a smaller kite would be indicated. I would suggest researching further on:
http://www.bayareakiteboarding.com/