The wind may be side offshore on Sunday there. No one really knows but I would checkout the forecast and real time wind sites carefully. If you check you will see the forecast changes a bit from place to place in South Florida. Where are you traveling from?
The local forecast from the NWS is at:http://forecast.weather.gov/MapClick.php?map.x=118&map.y=114&site=mfl&zmx=1&zmy=1
Saturday is to have a high of 73 F and Sunday 61 F. Sunday is pretty cold by local standards more so with wind chill. If you plan to be out for a while I would wear something pretty warm including a hood. I would wear the heaviest wetsuit I have a 5/4 with vest if I planned on going out for the day.