National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Areas of Extreme Heat and Excessive Rainfall Potential

Dangerous and extreme heat will remain across portions of the central U.S. this week, persisting across the mid to lower Mississippi Valley, Gulf Coast, southern Plains and portions of Texas. A heat wave over the Southwest U.S. will peak this weekend. Heavy to excessive rainfall may produce flash flooding from the Delmarva Peninsula north into the Hudson Valley today and tonight. Read More >

Hazardous Weather Conditions

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Partly Cloudy

88°F

31°C

Humidity 68%
Wind Speed SW 15 mph
Barometer 29.81 in (1008.1 mb)
Dewpoint 76°F (24°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 28 Jul 11:53 am EDT
Extended Forecast for

Knoxville TN

  • This Afternoon

    This Afternoon: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny and hot, with a high near 92. Heat index values as high as 103. West wind 10 to 15 mph, with gusts as high as 25 mph.

    High: 92 °F

    Chance
    T-storms

  • Tonight

    Tonight: Showers and thunderstorms likely, mainly before 9pm. Partly cloudy, with a low around 70. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    Low: 70 °F

    T-storms
    Likely then
    Partly Cloudy

  • Wednesday

    Wednesday: Mostly sunny, with a high near 87. Calm wind becoming north around 5 mph in the afternoon.

    High: 87 °F

    Mostly Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 64. North wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 85. Calm wind becoming north around 5 mph in the afternoon.

    High: 85 °F

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 64. Calm wind.

    Low: 64 °F

    Mostly Clear

  • Friday

    Friday: Mostly sunny, with a high near 87. Calm wind.

    High: 87 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly cloudy, with a low around 68.

    Low: 68 °F

    Mostly Cloudy

  • Saturday

    Saturday: A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 86. Chance of precipitation is 40%.

    High: 86 °F

    Slight Chance
    Showers then
    Chance
    T-storms

Detailed Forecast

This Afternoon
A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny and hot, with a high near 92. Heat index values as high as 103. West wind 10 to 15 mph, with gusts as high as 25 mph.
Tonight
Showers and thunderstorms likely, mainly before 9pm. Partly cloudy, with a low around 70. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Wednesday
Mostly sunny, with a high near 87. Calm wind becoming north around 5 mph in the afternoon.
Wednesday Night
Mostly clear, with a low around 64. North wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 85. Calm wind becoming north around 5 mph in the afternoon.
Thursday Night
Mostly clear, with a low around 64. Calm wind.
Friday
Mostly sunny, with a high near 87. Calm wind.
Friday Night
Mostly cloudy, with a low around 68.
Saturday
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Mostly cloudy, with a high near 86. Chance of precipitation is 40%.
Saturday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 70. Chance of precipitation is 50%.
Sunday
Showers and thunderstorms likely. Mostly cloudy, with a high near 86. Chance of precipitation is 70%.
Sunday Night
Showers and thunderstorms likely. Mostly cloudy, with a low around 69. Chance of precipitation is 60%.
Monday
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Knoxville TN
 35.96°N 83.91°W (Elev. 942 ft)
Last Update:
10:51 am EDT Jul 28, 2026
Forecast Valid:
12pm EDT Jul 28, 2026-6pm EDT Aug 3, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation