Watch the skies and head into a quick service. It typically rains between 3-5 for about 20 minutes. Once you are done eating, the rain will have stopped and you enjoy the parks after many have left! In August, it will say everyday for Florida! If you are really concerned, get an app that shows weather coming in with times and plan around it. Reality, we go all the time in August (because of occupation) and it can be a great time to go with less crowds. There is also shopping you can do when the storms hit, but many will be shopping with you!