August is a transitional time for Disney crowds. We will actually be checking in on August 27, 2016.
Crowds start out as heavy summer crowds at the start of the month, and they decline significantly by the last few days of the month.
In your case: August 14th, I would still expect summer peak crowds. Not Christmas/Spring break level crowds, but still pretty bad.
By the last couple days of that time frame, you might see crowds start to moderate. Florida schools usually go back in session 2 weeks before labor day. That causes a sharp drop in crowds... As of August 22, 2016. So you may see a sudden drop in the crowds the last few days of your trip.