Either that or set up the grill at the perimeter of the garage and let the smoke blow out. Think my Dad liked the garage idea because that's the location of the adult beverages.
July 4th is almost a guaranteed lock at getting roasted and a decent chance of a late day T-storm screwing up your BBQ. If not your BBQ, then if you had plans to see a local firework display later that evening, it would screw that up.
48F / drizzle and mist