Thats the standard weather for this time of year..I wouldnt take much notice of it because it will be nearly wall to wall sunshine with, maybe, a huge big tropical downpour for a short while in the afternoon, then back to the wall to wall sunshine. Very typical weather for the summer months and it nearly always shows as rain in the weather forecasts. Without a doubt no jacket required and maybe a poncho thingy if you don't mind sweating buckets underneath it