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 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.

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.

Such is the setting for what’s slated to become the hottest 49ers game played at Levi’s Stadium in Santa Clara. The Week 5 NFL contest between the 49ers (2-2) and Arizona Cardinals (1-3) was set for 1:05 p.

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.