I live in California and use my suits all the time. When I was younger I would have brought a new one for each day... now I bring 2-3 for a week long cruise.
I don't usually buy any online though, I like to try them on first! If I need to get one in the winter time though, I have to go to a sporting goods store unless I want to buy overpriced ones at the beach.
Carnival Spirit - Exotic Mexican Riviera - January 9, 2008
Carnival Pride - Mexican Riviera - August 5, 2007