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

86°F

30°C

Humidity 49%
Wind Speed W 12 mph
Barometer 30.04 in (1015.9 mb)
Dewpoint 65°F (18°C)
Visibility 8.00 mi
Heat Index88°F (31°C)
Last update 19 Aug 1:53 pm EDT
Extended Forecast for

4 Miles S Maryville TN

  • This Afternoon

    This Afternoon: Sunny, with a high near 89. Calm wind.

    High: 89 °F

    Sunny

  • Tonight

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

    High: 89 °F

    Chance
    Showers then
    Mostly Sunny

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms before midnight, then showers likely and possibly a thunderstorm between midnight and 2am, then a chance of showers and thunderstorms after 2am.  Increasing clouds, with a low around 70. South wind around 5 mph becoming calm.  Chance of precipitation is 70%.

    Low: 70 °F

    Chance
    T-storms then
    Showers
    Likely

  • Friday

    Friday: A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm.  Partly sunny, with a high near 87. Calm wind becoming west around 5 mph in the afternoon.  Chance of precipitation is 60%.

    High: 87 °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. West wind around 5 mph becoming calm.  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 northwest 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 87.

    High: 87 °F

    Sunny

Detailed Forecast

This Afternoon
Sunny, with a high near 89. Calm wind.
Tonight
Partly cloudy, with a low around 71. Calm wind becoming southwest 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. Southwest wind around 5 mph.
Thursday Night
A chance of showers and thunderstorms before midnight, then showers likely and possibly a thunderstorm between midnight and 2am, then a chance of showers and thunderstorms after 2am. Increasing clouds, with a low around 70. South wind around 5 mph becoming calm. Chance of precipitation is 70%.
Friday
A chance of showers before 11am, then a chance of showers and thunderstorms between 11am and 2pm, then showers likely and possibly a thunderstorm after 2pm. Partly sunny, with a high near 87. 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. West wind around 5 mph becoming calm. Chance of precipitation is 60%.
Saturday
Mostly sunny, with a high near 88. Calm wind becoming northwest around 5 mph in the afternoon.
Saturday Night
Partly cloudy, with a low around 67.
Sunday
Sunny, with a high near 87.
Sunday Night
Partly cloudy, with a low around 66.
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 S Maryville TN
 35.69°N 83.97°W (Elev. 1099 ft)
1:31 pm EDT Aug 19, 2026
2pm 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