Knoxville

Knoxville Braces for Clear Skies, Thunderstorms, and Heat on the Horizon

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Published on August 20, 2025
Knoxville Braces for Clear Skies, Thunderstorms, and Heat on the HorizonSource: Google Street View

Residents in Knoxville and surrounding regions should anticipate a mix of clear skies and potential thunderstorms over the next several days, according to the National Weather Service (NWS) in Knoxville. As of this morning, the city is under an overcast sky with a humid 73°F temperature, accompanied by a comforting calm wind for anyone stepping out early. The NWS forecast expects showers and thunderstorms primarily between 3:00 p.m. and 4:00 p.m. today, with a high near 90°F potentially heating things. Gusts of southwest wind are picking up slightly, blowing at around 5 mph, while the heat index could reach an intense 97 degrees.

Tonight, the thunderstorm chances drop to 30 percent before 8:00 p.m., leading into a partly cloudy evening with a low around 71°F, featuring a north wind that will be felt calming down to a soft breeze. As we move ahead, Thursday promises partly sunny skies with a high of 87°F and light northern winds expected in the afternoon. The NWS mentions that over the weekend, we can expect a 40 percent chance of showers and thunderstorms, mainly after 2:00 p.m. on Saturday, yet it's mostly sunny with a high nearing 86°F during the daytime.

The Hazardous Weather Outlook released by the National Weather Service in Morristown, TN, covers a broad area including southwest North Carolina, east Tennessee, and southwest Virginia. It points to scattered storms with potential gusty winds and isolated flooding risks today and this evening. However, from Thursday through Tuesday, there's a lower chance of widespread hazardous conditions.

No spotter activation is required at this time, but the NWS advises the public to stay alert. For those planning outdoor activities or travel over the next week, be sure to keep an eye on updates, as the weather can change with the region known for its quick shifts in conditions. Sunday night is looking mostly clear, but there's still a 30 percent chance of showers and thunderstorms before that notorious 8:00 p.m. cutoff. Easing into next week, expect sunny skies on Monday with a high near 82°F, providing a brief respite before another probable bout of precipitation on Tuesday.