Knoxville is starting Monday in dense fog, but the gray lid is temporary: skies are expected to turn mostly sunny as temperatures surge to 91 degrees, with heat index values near 101. At McGhee Tyson Airport, temperatures were around 70 degrees early Monday and visibility was about half a mile. The forecast then keeps the city hot and increasingly storm-prone through the weekend.
A Dense Fog Advisory from the National Weather Service Morristown office remains in effect through 10 a.m. Monday for Knox County and parts of East Tennessee. Drivers should slow down, use their headlights and leave extra distance while fog lingers, though forecasters expect it to lift quickly after sunrise.
Sunny, Sweltering Afternoon
Once the fog burns off, temperatures should climb rapidly, reaching the mid-80s around midday and topping out near 91 degrees during the afternoon. Southwest winds will stay light at 5 mph or less, but the humidity will make it feel closer to 101. Anyone spending time outside should take breaks, drink water and avoid treating a sunny sky as a free pass from the heat.
Storm Chances Increase Tuesday
Tuesday brings another hot afternoon, with a high near 92 and a 40% chance of showers and thunderstorms after 2 p.m. Storm chances remain elevated Tuesday night before becoming more widespread Wednesday, when the forecast calls for a 60% chance of showers and thunderstorms. The strongest storms could produce damaging wind gusts and localized flooding, especially where heavy rain falls repeatedly.
Hot Pattern Hangs On Through Weekend
Thursday and Friday should stay near 92 degrees with additional 40% storm chances, while Saturday reaches about 92 with a 30% chance of afternoon storms. Sunday looks slightly hotter at 93 degrees, although the rain chance drops to 20%. Overnight lows remain muggy, generally between 73 and 75 degrees, so Knoxville gets little relief even after sunset.
