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.

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,

Niner fans were ready for battle at Levi's Stadium but many were not expecting unsportsmanlike conduct from the weather.

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.