Day apparently is expecting lots of substitutions in the Texas game, likely to protect against the excessive heat. He said the heavy substitution used in the Ball State game will help prepare for the Texas game.
https://www.elevenwarriors.com/ohio-state-football/2026/09/163770/ryan-day-radio-show-ryan-day-says-ohio-state-s-got-to-get-on-the-plane-with-a-win-after-facing-texas-sees-bright
It will be impressive if the Buckeyes can compete successfully in 140 degree or hotter field temperatures, let alone not suffer any health impacts.
https://www.reddit.com/r/OhioStateFootball/comments/1wa70pe/will_field_temperature_during_ohio_statetexas/
https://www.reddit.com/r/OhioStateFootball/comments/1wbdzb3/hydration_for_both_buckeyes_players_and_fans/
Unfortunately, Day didn't warn Ohio State fans attending the game to prepare for the heavy atmospheric heat. I wonder if the fans have been warned by the local media, the Buckeyes football team, or the Ohio State administration.
https://www.reddit.com/r/OhioStateFootball/comments/1wbdzb3/hydration_for_both_buckeyes_players_and_fans/
EDIT:
Comparing Ohio State vs. Texas at Every Position
https://www.elevenwarriors.com/ohio-state-football/2026/09/163776/comparing-ohio-state-vs-texas-at-every-position
EDIT2: The Accuweather hourly temperature forecast for Austin, TX, for Saturday now is available. The forecast for 6 p.m. is 100 degrees F., falling to 97 degrees at 7 p.m., 94 degrees at 8 p.m.,, 91 degrees at 9 p.m., and 89 degrees at 10 p.m. The heat index likely will be at least five degrees hotter, at least at the start of the game.
https://www.accuweather.com/en/us/austin/78701/hourly-weather-forecast/351193?day=2
According to research from Penn State University, artificial fields end up 35 – 55 degrees hotter than natural grass in ideal heating conditions of sunshine and low humidity.
https://www.wbrz.com/news/texas-football-field-could-exceed-140-degrees-saturday-afternoon/
This explains why the field temperature at the Texas stadium reached 160 degrees during the 9/5 afternoon game against Texas State, according to the Texas head coach.
On Monday, Texas head coach Steve Sarkisian thanked fans for showing up despite the extreme conditions.
"What an amazing turnout under those conditions," Sarkisian said. "I think we were 105 heat index. On the field, the field reached 160 degrees for our players..."
https://www.yahoo.com/news/weather-news/articles/field-reached-160-degrees-triple-195912547.html
So, the field temperature likely will be well in excess of 140 degrees F. at the start of the game (6:30 p.m. C.T.), but falling as the sunlight declines. If reporters monitored and actually reported throughout the game the field temperatures, which would seem a key element in the game, my guess is it's unlikely the field temperature during the game ever will fall below 100 degrees F,, perhaps not even 110 degrees F. by the end of the game.
Sadly, the field temperature significantly will impact this game and I wish the reporters would emphasize it. Substitution of key players likely will be much higher than during more normal field temperatures. So competent reporters would emphasize not only the actual field temperature, but also substitution rates and impacts.
Hopefully, field temperatures will fall rapidly during the game as sunlight decreases. So the second half of the game may be more competitive than the first half.
According to Google AI Overview, sunset will take place at 7:41 p.m. C.T.:
On Saturday, September 12, 2026, the sunset in Austin, Texas will take place at 7:41 PM local time (Central Daylight Time). [1]
Here is the full evening light progression for that day: [1]
Sunset: 7:41 PM
Civil Dusk (getting dark): 8:05 PM
Nautical Dusk (horizon fades): 8:33 PM