For the time period you are thinking about, you should not need heavy winter clothes, but sweaters, windbreakers and perhaps raingear are a good idea. Also, you will still likely have some muggy summer days.

Also, you should not have a problem finding specialty food markets close to SF. Plus, I've been told there is a reasonably large Asian population in the area. If you have any trouble, SF is a very multi-cultural city and has many many asian markets.