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.

Mostly Cloudy

81°F

27°C

Humidity 74%
Wind Speed W 5 mph
Barometer 29.96 in (1013.2 mb)
Dewpoint 72°F (22°C)
Visibility 10.00 mi
Heat Index85°F (29°C)
Last update 21 Aug 6:53 pm EDT
Extended Forecast for

Alcoa TN

  • Tonight

    Tonight: 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 sunny, with a high near 89. Calm wind becoming west around 5 mph in the afternoon.

    High: 89 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: A slight chance of showers and thunderstorms between 10pm and 11pm. Partly cloudy, with a low around 66. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 66 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Partly sunny, then gradually becoming sunny, with a high near 86. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 86 °F

    Becoming
    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 62. Northwest wind around 5 mph becoming calm in the evening.

    Low: 62 °F

    Mostly Clear

  • Monday

    Monday: Mostly sunny, with a high near 87. Calm wind becoming west around 5 mph.

    High: 87 °F

    Mostly Sunny

  • Monday Night

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

    Low: 63 °F

    Mostly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 88.

    High: 88 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 66.

    Low: 66 °F

    Partly Cloudy

Detailed Forecast

Tonight
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 sunny, with a high near 89. Calm wind becoming west around 5 mph in the afternoon.
Saturday Night
A slight chance of showers and thunderstorms between 10pm and 11pm. Partly cloudy, with a low around 66. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Sunday
Partly sunny, then gradually becoming sunny, with a high near 86. Calm wind becoming northwest around 5 mph in the afternoon.
Sunday Night
Mostly clear, with a low around 62. Northwest wind around 5 mph becoming calm in the evening.
Monday
Mostly sunny, with a high near 87. Calm wind becoming west around 5 mph.
Monday Night
Mostly cloudy, with a low around 63. North wind around 5 mph becoming calm.
Tuesday
Mostly sunny, with a high near 88.
Tuesday Night
Partly cloudy, with a low around 66.
Wednesday
A 40 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 90.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Thursday
A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
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, with a high near 89.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Alcoa TN
 35.8°N 83.98°W (Elev. 955 ft)
Last Update:
7:06 pm EDT Aug 21, 2026
Forecast Valid:
7pm EDT Aug 21, 2026-6pm EDT Aug 28, 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