This year the weather pattern all over Europe has been simply too extreme. Temperatures in Vienna exceeded 44C in early August. Things are much better now. Good time to visit to a typicalViennese institution ; one of the the many "Heuriger " is in Grinzing. I recommend you try this informal home from home very inexpensive eating with local delicacies. Anyone can tell you how to get there by tram, bus or by car.