The weather the first day will be fairly close to LA, but will get progressively warmer as the ship heads south. The weather all three times I have done this cruise has been sunny and warm while in the ports. I find that anything you might wear to go out for a weekend on land is appropriate, I usually wear khakis or shorts and comfortable shoes. I see women in anything from shorts to pants to dresses or skirts. I am getting off the ship the day you get on. Enjoy your first (but, hopefully not your last) cruise!!!