Clear skies and a cool start near 59°F greet Knoxville on Sunday, May 17, 2026, but by afternoon you will be breaking a sweat. Mostly sunny skies will push highs into the upper 80s to around 90 degrees across the Oak Ridge–Knoxville area. If you are heading outside, keep water handy, and be aware that a stray late-afternoon shower or thunderstorm is possible, mainly over higher terrain.
Afternoon Heat Peaks Near 90
Highs are expected to reach near 90 this afternoon, then repeat the performance Monday and Tuesday as an upper-level ridge builds over the southern Appalachians. South to southwest winds stay on the lighter side, generally 0 to 10 mph, with occasional gusts nudging into the 15 to 20 mph range. Temperatures will run about 10 to 15 degrees above what is typical for mid-May, according to the National Weather Service Morristown.
Storms Return Midweek
A weak disturbance could trigger an isolated thunderstorm this evening along the ridges and closer to the Georgia line, but the bigger story is the shift back to wetter weather from Wednesday through Friday. Forecasters expect the best chances for more widespread showers and thunderstorms on Wednesday and again later in the week. Any stronger storms could deliver brief gusty winds, so keep an eye on updates if you have outdoor plans, per the National Weather Service Morristown.
Event Plans and What To Bring
If you are heading to Suttree Landing Park for the Cattywampus Puppet Council parade and block party this afternoon (1001 Waterfront Dr SE), plan on hot sunshine as the main backdrop. Bring plenty of water, sunscreen, and a hat, since shade will be limited during the peak heat. Any brief storms that pop up could drop sudden downpours, so a light rain layer is not a bad idea. Check start times and activity details at the Knox Ooze.
As you make travel or outdoor plans, expect a shift from a dry, very warm stretch into a stormier pattern by midweek. There are no local advisories in effect this morning, yet updates will be issued if conditions change. Plan to check the latest forecast, be ready to adjust outdoor activities, and keep water close at hand during the afternoon heat.
