Knoxville Fog Lifts as Weekend Sizzler, Tennessee Valley Heat Wave Looms

Knoxville is waking up to mostly clear skies and temperatures around 72 degrees Friday, but patchy fog could briefly slow the morning before clearing. From there, the forecast turns sunny, hot and mostly dry, with a high near 89.

Friday Fog Burns Off Before Afternoon Heat

Fog is expected to linger in spots until about 10 a.m., especially near waterways and other low-lying areas. The National Weather Service says a few isolated showers or thunderstorms may develop this afternoon, with the best odds near the eastern mountains, though most of Knoxville should stay dry and the overall severe-weather risk is low.

Winds will remain light from the north at 5 mph or less. Friday night should be partly cloudy, with temperatures dropping to about 67 degrees.

Weekend Looks Mostly Dry

Saturday brings sunny skies and a high near 91, followed by a partly cloudy night with a low around 70. Sunday should be similar, with mostly sunny conditions and another high near 91.

Most locations are expected to remain dry through the weekend, making it a relatively easy forecast for outdoor plans. Any storm activity that develops is more likely to be isolated and tied to the higher terrain than widespread across the city.

Heat Builds Into Next Week

The bigger weather story arrives Monday through Thursday, when highs are forecast to climb from 92 to 95 degrees. Overnight lows will stay in the low to mid-70s, and humidity could push heat-index readings into the 100-to-105-degree range across the Tennessee Valley.

That is a notable shift from the recent Hoodline forecast, which focused on more immediate triple-digit-feeling heat and storm chances. The latest outlook keeps the weekend quieter before the hottest stretch takes over early next week.

Storm chances remain limited but do not disappear entirely, with slight chances of afternoon showers and thunderstorms returning Wednesday and Thursday. No watches, warnings or advisories are listed for Tennessee in the current forecast package, but residents should plan for shade, water and breaks from the heat as temperatures rise.