The record-breaking heat for a San Francisco 49ers game at Levi’s Stadium has sent fans at the game down to the concourses. According to Fox — the network broadcasting Sunday’s game — the temperature was 95 degrees at kickoff and hit 100 degrees in the middle of the second quarter.

Active for the Niners are two All-Pros who were questionable entering Sunday’s game after missing two practices last week: tight end George Kittle (ribs) and linebacker Fred Warner (ankle). Warner missed the second half of last week’s 30-13 win over the Patriots after suffering his injury, and Kittle also picked up his injury in that game.

The Arizona Cardinals are accustomed to the desert heat on a daily basis, and the schedule reflects that with morning practices at the team’s facility in Tempe. They were probably figuring the weather wouldn’t be a factor for Sunday’s game against the 49ers in Santa Clara,

According to AccuWeather, the high for Sunday's Cardinals-49ers game will be 99 degrees, which wouldn't be anything new if the game was in Arizona. Instead, it's projected to be the hottest game in the 11-year history of Levi's Stadium.

The San Francisco 49ers, along with their fans, are preparing for what is expected to be the hottest gametime temperature in Levi's Stadium history as they face the Arizona Cardinals on Sunday. Kelsi Thorud reports.

NFL regular season game is set to be the hottest in stadium history on Sunday. It might be October, but it still feels like summer in many cities across the country this weekend. We've had surprisingly high temperatures during the first weekend of the 10th month of the year.

According to AccuWeather, the high for Sunday's Cardinals-49ers game is 99 degrees, which wouldn't be anything new if the game was in Arizona. Instead, it's projected to be the hottest game in the 11-year history of Levi's Stadium.