Sunny mornings are common but then as the day gets hotter,90-95 degrees with heat indexes of 100-115,the clouds tend to start forming around 1-2pm and then the rain comes.There's no guarantee it will be like this this is just the most common time frame.Sometimes the rain comes at 2pm,other days at 5pm,sometimes its just scattered showers and you might not get any rain in your area,other days its pretty much raining everywhere.Sometimes its a light sprinkle,sometimes they're worse than many hurricanes and last hours.Monday and Tuesday for example had really,really bad storms,flooding everywhere,on my drive home my car got pelted by hail and there was lightning all around me with rain and wind that had cars barely moving due to almost no visibility.Wind patterns and other factors also can influence where it rains,for example I went to Daytona on Saturday and apparently the winds were strong from the Atlantic and were moving the storms from Orlando towards the Gulf but in Daytona there wasn't a cloud in the sky.Basically if you come in the summer all you need to know is that it will rain,where,how long and how hard are all unpredictable so don't be upset if it rains and disrupts your trip.Sometimes as others mentioned the rain is a good thing as afterwards it drops the temperatures.Today wasn't as bad a washout as Monday and Tuesday,it rained but not as bad and it did stop so I chose to go to Sea World after work,amazingly it felt somewhat cool for this time of year,it rained and stopped and it felt as comfortable as its gonna get in July.If rain is a problem come between November and early May,dry season.