Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

Current conditions at

Knoxville, McGhee Tyson Airport (KTYS)

Lat: 35.82°NLon: 83.99°WElev: 981ft.

Mostly Cloudy

85°F

29°C

Humidity 53%
Wind Speed Calm
Barometer 30.05 in (1016.2 mb)
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index87°F (31°C)
Last update 19 Aug 12:53 pm EDT
Extended Forecast for

4 Miles SW Maryville TN

  • This Afternoon

    This Afternoon: Sunny and hot, with a high near 90. Calm wind.

    High: 90 °F

    Hot

  • Tonight

    Tonight: Partly cloudy, with a low around 71. Calm wind becoming south around 5 mph.

    Low: 71 °F

    Partly Cloudy

  • Thursday

    Thursday: A 40 percent chance of showers and thunderstorms, mainly before 10am.  Mostly sunny, with a high near 89. Heat index values as high as 96. West wind around 5 mph.

    High: 89 °F

    Chance
    Showers then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Showers and thunderstorms likely before 4am, then a chance of showers between 4am and 5am, then a chance of showers and thunderstorms after 5am.  Increasing clouds, with a low around 70. South wind around 5 mph becoming calm.  Chance of precipitation is 60%.

    Low: 70 °F

    Showers
    Likely

  • Friday

    Friday: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm.  Mostly sunny, with a high near 88. Calm wind becoming west around 5 mph in the afternoon.  Chance of precipitation is 60%.

    High: 88 °F

    Showers
    Likely

  • Friday Night

    Friday Night: Showers and thunderstorms likely before 11pm, then a slight chance of showers between 11pm and 2am.  Partly cloudy, with a low around 69. Northwest wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 60%.

    Low: 69 °F

    Showers
    Likely then
    Slight Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 88. Calm wind becoming west around 5 mph in the afternoon.

    High: 88 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 88.

    High: 88 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny and hot, with a high near 90. Calm wind.
Tonight
Partly cloudy, with a low around 71. Calm wind becoming south around 5 mph.
Thursday
A 40 percent chance of showers and thunderstorms, mainly before 10am. Mostly sunny, with a high near 89. Heat index values as high as 96. West wind around 5 mph.
Thursday Night
Showers and thunderstorms likely before 4am, then a chance of showers between 4am and 5am, then a chance of showers and thunderstorms after 5am. Increasing clouds, with a low around 70. South wind around 5 mph becoming calm. Chance of precipitation is 60%.
Friday
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 2pm. Mostly sunny, with a high near 88. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 60%.
Friday Night
Showers and thunderstorms likely before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 69. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Saturday
Mostly sunny, with a high near 88. Calm wind becoming west around 5 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 67.
Sunday
Sunny, with a high near 88.
Sunday Night
Partly cloudy, with a low around 65.
Monday
Mostly sunny, with a high near 87.
Monday Night
A 20 percent chance of showers. Partly cloudy, with a low around 66.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
4 Miles SW Maryville TN
 35.72°N 84.02°W (Elev. 1115 ft)
12:56 pm EDT Aug 19, 2026
1pm EDT Aug 19, 2026-6pm EDT Aug 25, 2026
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database