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Severe Thunderstorms and Heavy Rain in the Mid-Atlantic; Heat Persists Across the South

Scattered severe thunderstorms and excessive rainfall are possible into the night in the Mid Atlantic, and heavy rain will shift to Virginia and the Carolinas on Friday. Severe thunderstorms are also possible in the Central Plains into the Upper MS Valley and the Deep South tonight. Dangerous heat persists across the Southern Plains and Lower MS Valley and heat will expand into the Southwest. Read More >

Hazardous Weather Conditions

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Overcast

80°F

27°C

Humidity 76%
Wind Speed Calm
Barometer 30.03 in (1015.5 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 20 Aug 9:53 pm EDT
Extended Forecast for

Knoxville, McGhee Tyson Airport TN

  • Tonight

    Tonight: A chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Southeast wind around 5 mph becoming west after midnight. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 71 °F

    Chance
    T-storms

  • Friday

    Friday: A slight chance of showers before 2pm, then a slight chance of showers and thunderstorms between 2pm and 4pm. Mostly cloudy, then gradually becoming sunny, with a high near 89. Southeast wind around 5 mph becoming west in the afternoon. Chance of precipitation is 20%.

    High: 89 °F

    Slight Chance
    Showers then
    Slight Chance
    T-storms

  • Friday Night

    Friday Night: A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 69. Northwest wind around 5 mph becoming calm in the evening.

    Low: 69 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Saturday

    Saturday: Mostly cloudy, then gradually becoming sunny, with a high near 89. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 89 °F

    Decreasing
    Clouds

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 66. West wind around 5 mph becoming calm in the evening.

    Low: 66 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 87. Light north wind becoming northwest 5 to 10 mph in the afternoon.

    High: 87 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 63. Northwest wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Mostly Clear

  • Monday

    Monday: A 20 percent chance of showers after 2pm. Sunny, with a high near 87.

    High: 87 °F

    Sunny then
    Slight Chance
    Showers

  • Monday Night

    Monday Night: A 20 percent chance of showers. Partly cloudy, with a low around 63.

    Low: 63 °F

    Slight Chance
    Showers

Detailed Forecast

Tonight
A chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Southeast wind around 5 mph becoming west after midnight. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Friday
A slight chance of showers before 2pm, then a slight chance of showers and thunderstorms between 2pm and 4pm. Mostly cloudy, then gradually becoming sunny, with a high near 89. Southeast wind around 5 mph becoming west in the afternoon. Chance of precipitation is 20%.
Friday Night
A 20 percent chance of showers and thunderstorms before 9pm. Partly cloudy, with a low around 69. Northwest wind around 5 mph becoming calm in the evening.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 89. Calm wind becoming northwest around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 66. West wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 87. Light north wind becoming northwest 5 to 10 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 63. Northwest wind around 5 mph becoming calm in the evening.
Monday
A 20 percent chance of showers after 2pm. Sunny, with a high near 87.
Monday Night
A 20 percent chance of showers. Partly cloudy, with a low around 63.
Tuesday
A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 88.
Tuesday Night
A 10 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Wednesday
A 30 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 91.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Thursday
A 40 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 90.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Knoxville, McGhee Tyson Airport TN
 35.83°N 83.98°W (Elev. 961 ft)
Last Update:
7:06 pm EDT Aug 20, 2026
Forecast Valid:
11pm EDT Aug 20, 2026-6pm EDT Aug 27, 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