 The Weather Service expects high temperatures during that period each day to range between 110 and 115 degrees. Both the 4th of July and the 5th have projected highs of 114, while Wednesday, Saturday, and Sunday are expected to hit 113. And speaking to the Las Vegas Review-Journal Weather Service meteorologist Matt Woods, gave a 25 to 30 percent chance of tying Las Vegas' all-time high of 117 during the weekend.