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,

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.

The San Francisco 49ers have been practicing in temperatures exceeding 90 degrees this week. Sunday's game against the Arizona Cardinals is expected to set