Agree on the weather. I've been to Austin a number of times. A number of years back, I had back to back events during the summer and spent the weekend rather than going home. I enjoyed myself well enough but remember it was very much an exercise in managing activities so that I wasn't too active in the heat of the day. Remember going to some nearby caves, and to hill country, and then watching the bats in the evening.

Also lived in New Orleans for a few years and recall summer days were mostly spent going from AC to AC.