Knoxville started Friday, May 15, 2026, on a crisp note, with clear skies, light winds, and temperatures in the mid-40s helping the valley dry out in a hurry. Under full sunshine, those cool readings will not last long, with afternoon highs expected to climb into the upper 70s and top out near 78°F across the metro.
Weekend Warmup
The heat is set to build quickly as we head into the weekend. Saturday, May 16, 2026, is forecast to be mostly sunny with a high near 86°F and southwest winds around 0 to 10 mph, with gusts up to 20 mph. Sunday and Monday, May 17-18, 2026, look even hotter, with highs near 90°F on Sunday and around 92°F on Monday, roughly 10 to 15 degrees above normal for this time of year, according to the National Weather Service.
Low Humidity And Fire Risk
Relative humidity is expected to drop into the 20s on Friday afternoon, which will dry out lawns and brush and increase the potential for wildfire spread in some rural and exposed spots. Much of East Tennessee is still dealing with drought conditions, so residents should check the U.S. Drought Monitor along with local burn-ban pages before doing any open burning or firing up outdoor power tools.
Midweek Showers And Thunderstorms
Looking ahead, there is a slight chance of showers Tuesday night, May 19, 2026, with the best odds for a more widespread round of showers and thunderstorms on Wednesday and Thursday, May 20-21, 2026. If it pans out, that midweek rain could bring some meaningful drought relief in spots, although timing and coverage are still uncertain. For the latest adjustments, keep an eye on updated forecasts from the National Weather Service.
If you are planning to be outside this weekend, be ready for warm afternoons: drink plenty of water, grab some shade during the hottest hours, and make sure patio furniture and other loose items are secured before those gusty afternoons roll through.
