You should probably go to Austin Texas in September to November or March to May, when 70s and 80s are the anticipated daytime temperatures. As temperatures climb into the mid- to high 90s with high humidity, the Texan summer (June through August) is barely tolerable for unaccustomed visitors. Winter (December to February) is relatively mild and dry, with temperatures that hover in the low to mid-60s. Festivals are an integral part of Austin's culture. If your travel plans are flexible, then plan on attending a festival that interests you – just be prepared for inflated lodging rates.