We have been the past two years in August and had very different experiences. In 2009 we were there the third week (the 16-21 I believe) which happened to be the week that APs were unlocked. While the weather was gorgeous, the crowds were awful. Much worse than spring break. This year we braved DLR in August again, but were there the week before the APs were unblocked (the 15th - 20th). It was a much better experience! The weather was great - a little hot (90 two days) but nothing to complain about, and the crowds were MUCH lighter than last year. If we go in August again we will go the week just before APs are unblocked. I think this year that week coincided with a lot of kids back to school in SoCal so it worked our very well! (Don't get me wrong, it was still crowded, but really manageable.)