According to the National Weather Service, the forecast temperature when the game is over
will be 86.
Here's the 7 pm forecast for the Reliant Park area per NWS:
Saturday, August 11 at 7pm
Dewpoint: 73°F Heat Index: 102°
F Wind: S 6mph
Precipitation Potential: 6% Sky Cover: 45% Relative Humidity: 52%
Rain: <10% Thunder: <10%
As much as I like the roof open, this is probably a good one to leave it closed the entire time.