Knoxville woke up Saturday, June 20, 2026, to clear skies, muggy air and temperatures in the low 60s. Mostly sunny conditions are on tap today with a high near 86°F, setting up a warm, quiet afternoon with very little wind. It is a good day to enjoy the dry weather because the pattern turns stormier by Sunday and ramps up further into Monday.
Afternoon Heat And Weekend Outlook
Temperatures climb into the mid-to-upper 80s this afternoon and push toward 90°F on Sunday, with the hottest readings in the late day. Sunday stays mostly sunny through much of the afternoon, but a slight chance of showers and thunderstorms (about 15–20%) develops after about 5 p.m., mainly across the plateau and southern valley. Winds remain light today and turn southwesterly on Sunday, generally 0–10 mph as humidity ticks up.
Monday Shows Multi-Round Storms
A stronger system arrives Monday, June 22, and is likely to bring multiple rounds of showers and thunderstorms, some of which could be organized and strong into the evening. Expect gusty southwest winds around 15 mph with gusts up to 35 mph, along with periods of heavy rain that could trigger localized flash flooding in low-lying or poorly drained spots. The National Weather Service in Morristown is flagging the potential for organized severe storms and an increased flood risk Monday, so keep an eye on forecasts and watches as the weekend progresses, according to NWS Morristown.
What To Know
If you have outdoor plans Monday evening, it is smart to move them earlier in the day or inside. Lightning, damaging wind gusts and heavy downpours are the main concerns. Secure loose outdoor furniture, avoid parking under trees when possible, and be ready for quick ponding on city streets during heavier bursts of rain. Keep weather alerts turned on and check the latest forecast before heading out.
Hoodline Update
We published a forecast earlier this week that had storms holding off until later in the week; updated guidance now shifts the main threat forward to Monday. For background, see our earlier forecast calling for late-week storms.
