Knoxville is starting Thursday socked in with fog and mist, but it will not stay gloomy for long. KDKX was reporting about 48°F at 6:35 a.m. Thursday, April 23, 2026, across the valley. The low clouds should lift by mid-morning, and once the sun takes over, temperatures will shoot into the low 80s this afternoon with light southwest breezes of 0 to 5 mph.
Afternoon Warmup
The National Weather Service in Morristown says an upper-level ridge will keep the Knoxville area unseasonably warm and dry through Friday. That pattern will drive afternoon relative humidity down into the 20s and 30s and raise fire-weather concerns. Expect mostly sunny skies today and Friday with highs near 83°F and light southwest to south winds. Some locations could see gusts up to about 20 mph on Friday.
Late Night Storm Chance
Late Friday into Saturday, a weak front could finally break the dry streak with showers and a few thunderstorms. The first chances arrive after about 8 p.m. Friday, with showers likely overnight and lingering into Saturday. Saturday should run a bit cooler with highs near 78°F and mostly cloudy skies, while precipitation chances climb into the 70 to 80 percent range in many spots.
Early Week Threat
A more organized system is expected Monday night into Tuesday, bringing the best chance for heavier showers and thunderstorms in this stretch. Forecasters note that early-week guidance shows a stronger signal for deeper Gulf moisture and faster winds aloft, so it is worth keeping an eye on updates if you have outdoor plans Monday night into Tuesday.
Fire Weather And Local Context
Low humidity paired with dry fuels will make the next few afternoons more susceptible to new fire starts, conditions that helped feed last week's House Mountain wildfire, which scorched roughly 40 acres. For local coverage of that incident, see the House Mountain wildfire that scorched 40 acres.
Legal Implications
Local officials have been using temporary burn bans this month when conditions warranted. Violating a burn ban can result in fines or other enforcement. Before any open burning, check your city or county website and follow fire department guidance.
How To Plan
Give yourself extra time for the morning commute while fog hangs around, then plan for dry, warm afternoons that are friendly to outdoor errands. From Friday night through Tuesday, have a backup plan for any outdoor events, avoid open burns, secure loose yard debris, and if you see smoke or a new fire, call 911 immediately.
