Tennessee Heat Dome to Ease After September 23
Tennessee has been experiencing sweltering conditions under one of the strongest heat domes in the world, which has been in place since September 16, 2026. This weather phenomenon, characterized by high humidity, limited cloud cover, and light winds, has caused temperatures to feel even hotter than recorded. According to NASA, heat domes trap heat by allowing sunlight to reach the ground unabated. While meteorological fall began on September 1, the astronomical fall, starting on September 22, is expected to bring some relief. Temperatures across the state are forecast to gradually cool, with Knoxville, Memphis, and Nashville seeing slight drops in highs starting September 23. However, a sustained cooldown is not expected until October.