It's starting to stay darker and cooler a little longer in the mornings, but that Texas-like ability to creep into the 90's by mid-day is still going strong enough to make you think twice about lighting cinnamon candles or ordering your various seasonal lattes. We'll be happily basking in the heat of summer until at least October around here.
In August, I was able to spend a lovely day here, and I kicked myself for letting over 4 years pass in Austin before finding the time to visit. Pace Bend Park has miles and miles of trails, exhilarating cliffs for jumping off into the water, countless campsites for overnight adventurers, and some swell trees for swinging your hammock. The shallow part of Lake Travis was feeling pretty bath-like that day, but it was all just fine.
If you're an Austin person looking for some sweaty hikes or your last swims of summer, or even a shoreline campground, I think it would really be worth your while.