Knoxville rolled into Memorial Day under a blanket of mostly cloudy, muggy air Monday, May 25, 2026, with temperatures hovering near 68°F and humidity already putting in some overtime. Showers are expected to develop later in the day, with thunderstorm chances ramping up from late morning into the mid-afternoon and a high near 80°F. Anyone with outdoor plans should have a solid indoor backup ready to go today.
Timing And Impacts
Rain is possible before 11 a.m., with showers and thunderstorms most likely between about 11 a.m. and 4 p.m., and additional storm rounds remaining on the table into the evening and overnight. New rainfall totals of roughly a tenth to a quarter of an inch look likely for many spots, though any stronger cell could dump heavier, brief downpours that trigger localized flooding. Daily thunderstorm chances stick around through midweek. Temperatures hold near 80°F with a low near 65°F tonight, according to NWS Morristown.
Holiday Plans? Bring A Backup
Memorial Day picnics, cookouts, and ceremonies will be playing dodgeball with the radar. If you can, move activities under cover; short, intense downpours can quickly shut down low-lying roads and turn yards into mud pits. The threat for severe wind looks limited, but gusty pockets, particularly on ridgetops, are still in play. For how this setup developed, see our muggy storm parade outlook.
Drive Times And Smokies Travel
Plan on wet roads and slower drive times through the afternoon, with extra travel time a smart idea and standing water in low spots something to steer clear of. If you are heading into the Smokies, higher-elevation gusts can make those winding roads a tougher ride, so ease off the gas and keep an eye on changing conditions. The forecast discussion from the NWS also notes that the Flood Watch that had been in effect will not be extended at this time, although additional rounds of heavy rain are still anticipated later Monday, per NWS Morristown.
Quick Prep Tips
Grab an umbrella and a waterproof layer on your way out the door, secure any loose patio furniture before the gusts show up, and keep children and pets away from creeks and low spots when heavier cells roll through. Check radar before heading out and keep weather alerts turned on so you will know if storms organize or a warning is issued. We will update this story if watches or warnings change.
