We often travel in August and would go to the pool in the morning and stay until lunchtime. Then clean up and head to a park. Even if it rained later in the day there was plenty to do inside. Honestly, sometimes it’s a brief shower, other times it rains the rest of the evening. We use the app Dark Sky and find it very accurate. (Ex. Rain starting in 10 minutes or no precipitation the next hour).
Our daughter’s family is down there now and they have used the pool twice in the mornings-it’s nearly empty. They have found the lines are not long at all on those days. In fact, none of the days, no matter when they go. She also said they are rarely more than 2-3 families on a bus (they are at BCV).
We were really worried about them going (and decided not to go ourselves) but every thing she has shared has reassured us.