Unless you get cold when no one else is cold, you do not need a sweatshirt. While it is true that the A/C is on low in the restaurants, we always find it to be wonderful after being out in the heat. Plus, what do you do with the sweatshirt until you need it -- carry it around? We've never needed a sweatshirt, long pants or a jacket and we've been in April, May, June, July and October.