The problem with January in Florida is you never know what you are going to get. This year it was 70 a couple of days before the race & by race morning we were freezing & pulling out our winter running clothes& I started the race with 2 pr pants, gloves, jacket, etc. I was planning on wearing shorts & short sleeve shirt. You will need to bring clothes for all situations. I think the year before it was really hot. Sorry I couldnt be more help.