We have gone in February for the past four years. We are from Maine and we usually wear shorts and t-shirts and a wind breaker type jackets. Usually by mid-morning we take off our wind breakers. We always go swimming. That being said, last year, I was cold. I wore jeans and a t-shirt most days. My DH still wore shorts. I would have my kids wear lightweight jogging pants and I would pack lightweight shorts in our backpack. They changed into shorts by midday most days but they would put the long pants back on when the sun went down. Because people on these boards suggested it, I always pack hats and small pairs of knit gloves in case it got cold. I thought people were crazy to suggest that but I still packed them last year and believe it or not, we broke them out for the parades and fire works one night. So, I guess you should be prepared for all types of weather.