Knoxville woke up Saturday, June 13, to a sticky, almost wind-free start, with temps in the upper 60s and humidity thick enough to feel like a wet blanket. Forecasters are calling for mostly sunny skies and a high near 90°F today, but all eyes are on Sunday, when numerous showers and thunderstorms could roll through with some punchy winds.
Afternoon Heat and Humidity
Saturday afternoon across the metro will be a classic hot-and-muggy slog: highs around 90°F and a heat index that could feel closer to 96°F, especially away from the river and higher terrain. With winds light or nearly calm, there is not much natural AC on the way, so midafternoon outdoor plans will likely feel downright steamy.
If you have to be outside, keep water handy, dial back heavy yard work or workouts during the hottest hours, and keep an eye on kids, older neighbors, and pets that can overheat quickly in these conditions.
Tonight Into Sunday
After about 2 a.m. tonight, a few showers and thunderstorms could start to pop up, with overnight lows near 72°F offering only limited relief from the heat. Sunday is the main trouble spot: numerous showers and thunderstorms are likely from late morning into the afternoon, with gusts that could reach 25 mph and localized downpours dropping roughly a quarter to a half-inch of rain.
According to the National Weather Service Morristown, a few storms may ramp up to strong or severe, with damaging wind as the primary concern. In other words, plan for gusty, wet conditions on Sunday, June 14, and be ready to adjust outdoor plans.
Event Impacts and What To Do
Weekend outdoor events could easily end up dodging storms, and next week’s Juneteenth activities may face some weather interference too, with local listings showing celebrations on Friday, June 19, that might coincide with showers and thunderstorms.
Visit Knoxville keeps a running calendar of community events, so organizers and attendees will want to keep one eye on that and the other on the evolving forecast. If you are planning or heading to an outdoor gathering, line up an indoor backup, secure tents and loose items, and take severe thunderstorm warnings seriously if they are issued.
Looking Ahead
After Sunday’s storms, conditions should trend cooler and drier on Monday and Tuesday, with highs easing back into the lower 80s. Scattered storms may try to make a return by late week, so anyone planning festivals, cookouts, or other outdoor events will want to keep checking for updated timing and coverage.
Stay tuned to forecast updates from the National Weather Service, and use local weather apps or NOAA weather radio for real-time alerts. If watches or warnings go up, treat them as a cue to move quickly and stay safe rather than background noise.
