It will still be over 80 and possibly around 90 at the start of the game but it won't be as hot. Based on early weather predictions, they are saying Austin will have a high of 89: http://www.accuweather.com/en/us/austin-tx/78701/daily-weather-forecast/351193?day=42 It will also help that the sun won't be high in the sky; instead, the sun will be down before the second half starts.