Hello Sushibear,
I was there in late July and I remember that during the day the weather was hot (80s?) but at 5 PM, the skies turned dark -- a bit chilly -- and the air was gritty. Weird. I even got a tan during the day just by walking around.
Seeksreal is right in that you can buy clothes there.
My preference is Rio Sul Shopping Center. It's five or six story shopping center. A ton of stores. I cold kick myself for not buying Christofle silverware. I guess I have to go back!
David