San Diego is 4 hours behind São Paulo
Best overlap: 12:00 PM to 6:00 PM in São Paulo is 8:00 AM to 2:00 PM in San Diego.
São Paulo and San Diego overlap from 12:00 PM to 6:00 PM (São Paulo) to the equivalent 8:00 AM to 2:00 PM in San Diego — that's your meeting window. You won't be short on options — 6 hours of overlap leaves space for recurring syncs and ad-hoc calls alike. A quick caveat — San Diego's clocks move for daylight saving and São Paulo's don't, so the times here are right for only part of the year.