Are you sure you want to know?
Okay, you asked for it. First, go stand in your shower, fully clothed, and make sure the water is on luke warm. Okay, nice and wet now? Good. Next, go get in your car - it really should be sitting out in the hot sun for several hours to get the full effect - and turn the heater on full blast. This works best if you have leather or vinyl seats so you can really get the full effect of your legs sticking to the seats. Now, sit there for a while. Like an hour or two.
Getting hard to breathe? Feel like your legs will be forever stuck to the seats? Feel like your clothes are clinging to you from sweating? Feel like the life is being sucked out of you? Good.
Now invite a couple dozen neighbors to come cram themselves into the car with you for awhile.
That's what August feels like!
Seriously, though, get the hoppers. You may want to take mid-day breaks during the hottest part of the day and go to a different park in the evening. Also, August is rainy season here, so bring ponchos and extra shoes and plan on having afternoon thunderstorms. There's plenty to do indoors around the parks when this happens, so don't worry.
So come on down and have a nice trip!