"Endless Summer: Tennessee's Heatwave Persists, But Is Autumn on the Horizon?"
In Tennessee, summer officially ends on September 22 according to the autumnal equinox, or on August 31 according to the meteorological definition. The autumnal equinox occurs on September 23 and marks the start of fall, with equal amounts of daylight and darkness. The temperatures in Tennessee are expected to remain high in the high 80s and 90s throughout September, but evening temperatures will start to drop to the mid-60s by the end of August and beginning of September.