An extreme heat warning is in effect in Las Vegas, with temperatures expected to reach 97 degrees, which is 20 to 25 degrees warmer than seasonal norms. An Extreme Heat Warning was put into effect at 2:25 am and will last until Sunday night at 8 p.m. Despite a weak system moving in, there is expected to be a few degrees of relief for the weekend. The NWS has predicted that Las Vegas will break daily records next week, potentially with warm overnight lows potentially breaking daily record lows.