NRG Stadium is a retractable roof stadium that first opened in 2002. It features artificial turf and the city of Houston experiences a very wide range of temperatures. Early in the season, 90s is fairly common. That's bad enough but during the winter, temperatures can get all way down to single digits. Rain is a common deal as well -- Houston see around 50 inches of rain per year.
So, no surprise, the roof is closed for nearly every game. And, when it is, there's basically no weather impact to games played at NRG Stadium (sit/start players based on stats/matchups).
= home game
Preseason Wk1
8/9Texans @ Vikings4:00 pm EST
Preseason Wk2
8/16Panthers @ Texans1:00 pm EST
Preseason Wk3
8/23Texans @ Lions1:00 pm EST
Week 1
9/7Texans @ Rams4:25 pm EST
Week 2
9/15Buccaneers @ Texans7:00 pm EST
Week 3
9/21Texans @ Jaguars1:00 pm EST
Week 4
9/28Titans @ Texans1:00 pm EST
Week 5
10/5Texans @ Ravens1:00 pm EST
Week 7
10/20Texans @ Seahawks10:00 pm EST
Week 8
10/2649ers @ Texans1:00 pm EST
Week 9
11/2Broncos @ Texans1:00 pm EST
Week 10
11/9Jaguars @ Texans1:00 pm EST
Week 11
11/16Texans @ Titans1:00 pm EST
Week 12
11/20Bills @ Texans8:15 pm EST
Week 13
11/30Texans @ Colts1:00 pm EST
Week 14
12/7Texans @ Chiefs8:20 pm EST
Week 15
12/14Cardinals @ Texans1:00 pm EST
Week 16
12/21Raiders @ Texans4:25 pm EST
Week 17
12/28Texans @ Chargers1:00 pm EST
Week 18
1/4Colts @ Texans1:00 pm EST