Knoxville is starting Monday, August 31, under clear skies and calm winds, but the comfortable morning will quickly give way to a long stretch of dangerous heat. Temperatures are expected to reach 93 degrees this afternoon, with the heat index climbing as high as 99. Rain is almost a nonfactor today, with just a 4% chance of precipitation.
Heat Builds Through Thursday
The hot pattern strengthens Tuesday, September 1, when Knoxville could reach 95 degrees with a heat index near 101. Wednesday and Thursday are forecast to peak around 96 degrees, while overnight lows remain in the low to mid-70s, offering limited relief after sunset.
The latest outlook is a sharper update to Sunday's Hoodline forecast, particularly for Tuesday's heat. The National Weather Service in Morristown says temperatures could run about 10 degrees above normal this week, and heat advisories may be considered later for parts of the Tennessee Valley.
Rain Chances Finally Return Friday
Dry weather dominates through Thursday, with daily rain chances staying near zero. According to the National Weather Service, Friday, September 4, brings a slight chance of morning showers followed by a 40% chance of showers and thunderstorms after 2 p.m.
Saturday will remain mostly sunny and hot near 93 degrees, with a 20% chance of afternoon showers or thunderstorms. Sunday looks slightly cooler at 92 degrees, with another small storm chance after 2 p.m.
Plan Around the Afternoon Heat
There are no watches, warnings or advisories in effect for the Knoxville area in the current forecast, but the heat index near or above 100 degrees can still make outdoor activity risky. Try to schedule strenuous work for the morning, take frequent water breaks and seek shade or air conditioning during the hottest part of the day.
