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

Dangerous Heat and Possible Flooding

Dangerous heat will persist across the Southwest U.S. through Saturday with daytime highs of 110-115°F. Extreme Heat Warnings remain in effect. Dangerous heat will build across the southern Plains again beginning this weekend. Heavy to excessive rain over the Carolinas Friday may lead to isolated areas of flash flooding. Read More >

Hazardous Weather Conditions

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

A Few Clouds

74°F

23°C

Humidity 88%
Wind Speed NW 5 mph
Barometer 29.99 in (1014.4 mb)
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 28 Aug 3:53 am EDT
Extended Forecast for

Maryville TN

  • Today

    Today: Patchy fog before 10am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 89. Calm wind becoming north around 5 mph in the afternoon.

    High: 89 °F

    Patchy Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Partly cloudy, with a low around 67. Northeast wind around 5 mph becoming calm in the evening.

    Low: 67 °F

    Partly Cloudy

  • Saturday

    Saturday: A 10 percent chance of showers and thunderstorms after 5pm. Sunny and hot, with a high near 91. Heat index values as high as 96. Calm wind.

    High: 91 °F

    Sunny then
    Slight Chance
    T-storms

  • Saturday Night

    Saturday Night: A 10 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 69. South wind around 5 mph becoming calm in the evening.

    Low: 69 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 91. Calm wind.

    High: 91 °F

    Hot

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 70. South wind around 5 mph.

    Low: 70 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 92. Calm wind.

    High: 92 °F

    Sunny then
    Slight Chance
    T-storms

  • Monday Night

    Monday Night: Partly cloudy, with a low around 72.

    Low: 72 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Sunny and hot, with a high near 93.

    High: 93 °F

    Hot

Detailed Forecast

Today
Patchy fog before 10am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 89. Calm wind becoming north around 5 mph in the afternoon.
Tonight
Partly cloudy, with a low around 67. Northeast wind around 5 mph becoming calm in the evening.
Saturday
A 10 percent chance of showers and thunderstorms after 5pm. Sunny and hot, with a high near 91. Heat index values as high as 96. Calm wind.
Saturday Night
A 10 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 69. South wind around 5 mph becoming calm in the evening.
Sunday
Mostly sunny and hot, with a high near 91. Calm wind.
Sunday Night
Partly cloudy, with a low around 70. South wind around 5 mph.
Monday
A 20 percent chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 92. Calm wind.
Monday Night
Partly cloudy, with a low around 72.
Tuesday
Sunny and hot, with a high near 93.
Tuesday Night
Mostly clear, with a low around 73.
Wednesday
A 20 percent chance of showers and thunderstorms. Sunny and hot, with a high near 94.
Wednesday Night
A 10 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Thursday
A 30 percent chance of showers and thunderstorms. Sunny and hot, with a high near 95.
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ABOUT THIS FORECAST

 
Point Forecast:
Maryville TN
 35.74°N 83.96°W (Elev. 1010 ft)
Last Update:
2:26 am EDT Aug 28, 2026
Forecast Valid:
4am EDT Aug 28, 2026-6pm EDT Sep 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