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

Dangerous Heat over the South-Central and Southwest U.S. Through Next Week

Dangerous heat persists across the Desert Southwest through this weekend and across the Southern Plains and Lower Mississippi Valley through at least the middle of next week. Numerous daily record high temperatures are expected through at least Tuesday for much of Texas and Oklahoma as well as portions of Louisiana, New Mexico, and Arizona. Read More >

Hazardous Weather Conditions

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Partly Cloudy

80°F

27°C

Humidity 64%
Wind Speed W 9 mph
Barometer 29.98 in (1013.9 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Heat Index82°F (28°C)
Last update 22 Aug 9:53 pm EDT
Extended Forecast for

Maryville TN

  • Tonight

    Tonight: A 20 percent chance of showers and thunderstorms before 11pm. Patchy fog after 4am. Otherwise, partly cloudy, with a low around 66. Southwest wind around 5 mph becoming calm.

    Low: 66 °F

    Slight Chance
    T-storms then
    Patchy Fog

  • Sunday

    Sunday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 88. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 88 °F

    Patchy Fog
    then Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 62. Northwest wind around 5 mph becoming calm.

    Low: 62 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 88. Calm wind becoming northwest around 5 mph.

    High: 88 °F

    Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 63. East wind around 5 mph becoming calm.

    Low: 63 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89. East wind around 5 mph becoming calm.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 66. Northwest wind around 5 mph becoming calm.

    Low: 66 °F

    Mostly Clear

  • Wednesday

    Wednesday: A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 91.

    High: 91 °F

    Mostly Sunny
    then Chance
    T-storms

  • Wednesday Night

    Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 40%.

    Low: 69 °F

    Chance
    T-storms

Detailed Forecast

Tonight
A 20 percent chance of showers and thunderstorms before 11pm. Patchy fog after 4am. Otherwise, partly cloudy, with a low around 66. Southwest wind around 5 mph becoming calm.
Sunday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 88. Calm wind becoming northwest around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 62. Northwest wind around 5 mph becoming calm.
Monday
Sunny, with a high near 88. Calm wind becoming northwest around 5 mph.
Monday Night
Partly cloudy, with a low around 63. East wind around 5 mph becoming calm.
Tuesday
Mostly sunny, with a high near 89. East wind around 5 mph becoming calm.
Tuesday Night
Mostly clear, with a low around 66. Northwest wind around 5 mph becoming calm.
Wednesday
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 91.
Wednesday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 69. Chance of precipitation is 40%.
Thursday
A chance of showers, with thunderstorms also possible after 8am. Partly sunny, with a high near 89. Chance of precipitation is 50%.
Thursday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Friday
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 90.
Friday Night
A slight chance of thunderstorms. Partly cloudy, with a low around 68. Chance of precipitation is 10%.
Saturday
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 91.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Maryville TN
 35.76°N 83.99°W (Elev. 886 ft)
Last Update:
7:06 pm EDT Aug 22, 2026
Forecast Valid:
10pm EDT Aug 22, 2026-6pm EDT Aug 29, 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