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

Heavy Rainfall and Flooding Threats in the Midwest and Ohio Valley; Heat Continues in the Plains and Southeast

An active pattern will continue to bring heavy to excessive rainfall and flash flooding threats to the Midwest and Ohio Valley over the next couple of days. Dangerous heat continues across the central/southern Plains and Southeast U.S. into next week. There is potential for record-tying/breaking temperatures with many areas forecast to see their hottest temperatures so far this year. 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 74%
Wind Speed SW 10 mph
Barometer 29.97 in (1013.7 mb)
Dewpoint 71°F (22°C)
Visibility 10.00 mi
Heat Index83°F (28°C)
Last update 12 Aug 11:53 pm EDT
Extended Forecast for

Maryville TN

Flood Watch August 13, 12:13am until August 13, 08:00am
Click here for hazard details and duration
Flood Watch
  •  
    Flood Watch August 13, 12:13am until August 13, 08:00am

    NOW until 8:00am Thu

    Flood Watch

  • Overnight

    Low: 73 °F

    Mostly Cloudy

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Partly sunny and hot, with a high near 91. Heat index values as high as 101. Southwest wind around 5 mph.

    High: 91 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A 30 percent chance of showers and thunderstorms, mainly between 7pm and 8pm. Partly cloudy, with a low around 75. South wind around 5 mph becoming calm.

    Low: 75 °F

    Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 93. Heat index values as high as 105. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 93 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 76. Southeast wind around 5 mph becoming calm.

    Low: 76 °F

    Chance
    T-storms then
    Partly Cloudy

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 94. Calm wind becoming west around 5 mph.

    High: 94 °F

    Mostly Sunny
    then Chance
    T-storms

  • Saturday Night

    Saturday Night: A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 75. Northeast wind around 5 mph becoming calm.

    Low: 75 °F

    Chance
    T-storms then
    Partly Cloudy

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 96.

    High: 96 °F

    Hot

Detailed Forecast

Overnight
Mostly cloudy, with a low around 73. Southwest wind around 5 mph.
Thursday
A 40 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Partly sunny and hot, with a high near 91. Heat index values as high as 101. Southwest wind around 5 mph.
Thursday Night
A 30 percent chance of showers and thunderstorms, mainly between 7pm and 8pm. Partly cloudy, with a low around 75. South wind around 5 mph becoming calm.
Friday
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 93. Heat index values as high as 105. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 76. Southeast wind around 5 mph becoming calm.
Saturday
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 94. Calm wind becoming west around 5 mph.
Saturday Night
A 30 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 75. Northeast wind around 5 mph becoming calm.
Sunday
Mostly sunny and hot, with a high near 96.
Sunday Night
Mostly clear, with a low around 76.
Monday
A 20 percent chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 96.
Monday Night
A 10 percent chance of showers and thunderstorms. Partly cloudy, with a low around 75.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 93.
Tuesday Night
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Wednesday
A 20 percent chance of showers and thunderstorms. Mostly sunny and hot, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Maryville TN
 35.76°N 83.96°W (Elev. 994 ft)
Last Update:
7:06 pm EDT Aug 12, 2026
Forecast Valid:
12am EDT Aug 13, 2026-6pm EDT Aug 19, 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