On our 4th trip to Vero last August, we had rain every day from about 1pm to 7pm ish. We borrowed ALOT of movies from the rental place. We visited the store ALOT. If it was a drizzle with no lightening/thunder, the pool was open, so we swam anyway. We still had alot of fun, but it did try our patience with 7 kids in our party of 12!. In fact, my husband planned a surprise vow renewal for our 10th anniversary - it was supposed to be held on the croquet lawn, but it rained. We ended up in a private room in the hallway heading to Shutters.
This was our 3rd time going in August and we have never had weather like that. The entire East Coast was stuck in a weather pattern of rain for the whole week, so it was definately a fluke.