Knoxville is starting Tuesday, August 11, with clear skies and temperatures around 73°F, but the calm morning is a setup for a hotter, stormier afternoon. The high is expected to reach 92°F, with a heat index near 102°F.
Heat Builds Before Storms Arrive
A slight chance of showers early will give way to a mostly sunny stretch before scattered showers and thunderstorms become more possible later in the day. The latest forecast from the National Weather Service Morristown puts Tuesday’s rain chance at 20%, with southwest winds around 5 mph.
Any storms that develop could bring brief heavy rain, damaging wind gusts, localized flooding and perhaps small hail. No watches or warnings are in effect for the Knoxville area Tuesday morning, but outdoor plans may need a backup option by late afternoon and evening.
Storm Chances Stick Around Through Thursday
Wednesday looks similarly hot, with a high near 92°F, a low around 74°F and a 50% chance of showers and thunderstorms. Another round of storms is possible Wednesday night, while Thursday brings partly sunny skies, a high near 93°F and a lower 20% rain chance after 2 p.m.
Forecasters expect storm chances to continue through the end of the workweek, with the main opportunities generally arriving during afternoon heating. The unsettled pattern also means one neighborhood could get a downpour while another stays mostly dry—a very East Tennessee arrangement.
Weekend Heat Keeps Its Grip
Friday through Monday stays hot, with highs from 93°F to 95°F and additional afternoon storm chances Friday and Monday. Sunday currently looks like the quietest day, with mostly sunny skies, a high near 94°F and only a small rain chance.
Anyone spending time outside Tuesday should take breaks from the heat, drink plenty of water and keep an eye on changing skies. If thunder is heard, head indoors, and avoid driving through water-covered roads during any sudden downpour.
