Chances are pretty low for Houston and the game is indoors when the roof is shut. This shouldn't affect the game.
The showers have been in the mid-afternoon almost all summer in Houston. Maybe 5 minutes, maybe an hour. Seldom late evening or at night. The weather will be fine at game time.
They have been calling for rain the last couple days, I'm holding off putting the water on the lawn. I'm gonna put it on so I can get some rain. Works every time.