Knoxville

Knoxville Braces for Week of High Heat and Occasional Thunderstorms, NWS Advises Caution

AI Assisted Icon
Published on August 18, 2025
Knoxville Braces for Week of High Heat and Occasional Thunderstorms, NWS Advises CautionSource: Google Street View

Knoxville residents can anticipate a streak of hot and sunny days peppered with the occasional chance of thunderstorms, according to the latest update from the National Weather Service (NWS) in Knoxville. The forecast for the coming week points to hot daytime conditions, with only slight relief expected at night.

Beginning today, the patchy morning fog is expected to clear, leading to a sunny and hot day with high temperatures nearing 93 degrees. "Heat index values as high as 98," predicts the NWS. Winds should remain mild, with a shift to the north at about 5 mph in the afternoon. Tonight's outlook remains mostly clear with lows around 71, offering some relief from the daytime heat.

The pattern of sunny mornings followed by a potential for showers continues into Tuesday, with a 20 percent chance of thunderstorms rolling in after 2 pm. Once again, the scorching heat is expected with heat index values matching today's high. NWS advises keeping an eye on the sky, as calming winds could bring ad-hoc thunderstorms in the evenings, particularly before 8 pm, with a 10 percent chance of weather disturbances.

Midweek forecasts hold steady—Wednesday boasts a 30 percent chance of afternoon showers and thunderstorms, with mostly sunny skies and a high of 92 degrees. "Calm wind becoming northwest around 5 mph," notes the forecast from the NWS. The nighttime should offer a slight, yet consistent chance of precipitation and partly cloudy skies with lows resting around 71 degrees.

Heading into the weekend, both temperatures and weather patterns are expected to remain steady. Thursday and Friday predict a continued mix of heat, sun, and routine chances for afternoon showers. A slight downturn in mercury suggests highs around 88-90 degrees. "A 30 percent chance of showers and thunderstorms after 2pm," the NWS asserts for both days, mirroring the unsettled afternoons characteristic of this week's climate.

The weekend forecast brings a modest dip in temperature to the mid-'80s, yet the 40 percent possibility of rain on Saturday signals the most significant likelihood of showers throughout the week. Partial clouds will persist into the evening, with an enduring 30 percent chance of rainfall, and similar conditions are slated for Sunday.

To stay informed on the latest weather updates for Knoxville and to plan the week accordingly, visit the National Weather Service website for real-time information and detailed forecasts.