These Are the 10 Hottest US Cities Texas is sizzling By Arden Dier, Newser Staff Posted Jun 25, 2016 11:00 AM CDT 44 comments Comments The sun rises over the desert north of Phoenix. (AP Photo/Charlie Riedel) (Newser) – You know what they say, if you can’t stand the heat, get out of Texas. 24/7 Wall St. has rounded up the hottest US cities based on the average number of days each year that temperatures reached at least 90 degrees since records began. A whopping seven of the top 10 are in the Lone Star State. The hottest cities and their average number of 90+ degree days: Phoenix, Ariz.: 169 Tucson, Ariz.: 146 Las Vegas, Nev.: 135 Del Rio, Texas: 134 Brownsville, Texas: 124 San Antonio, Texas: 116 Austin, Texas: 114 San Angelo, Texas: 114 Corpus Christi, Texas: 112 Waco, Texas: 111 Click for the full list or check out the best cities for lazy people.