It’s even hotter than was expected on a record-breaking day at Levi’s Stadium for Sunday’s San Francisco 49ers game — and the Niners may have reason to have a gripe with the NFL over it. San Francisco made a late switch to its throwback uniforms for Sunday’s game,

The 49ers along with their fans are going to be sweating it out in their red and gold for Sunday's game against the Cardinals, with temperatures expected to be in the 90s at kickoff at Levi's Stadium 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.