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.

Fair

72°F

22°C

Humidity 84%
Wind Speed Calm
Barometer 29.98 in (1014.0 mb)
Dewpoint 67°F (19°C)
Visibility 10.00 mi
Last update 19 Aug 2:53 am EDT
Extended Forecast for

3 Miles WNW Louisville TN

  • Overnight

    Overnight: Mostly clear, with a low around 69. Calm wind.

    Low: 69 °F

    Mostly Clear

  • Wednesday

    Wednesday: Patchy fog between 7am and 8am.  Otherwise, sunny and hot, with a high near 91. Heat index values as high as 96. Calm wind.

    High: 91 °F

    Patchy Fog
    then Sunny

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 72. Calm wind.

    Low: 72 °F

    Partly Cloudy

  • Thursday

    Thursday: Showers and thunderstorms likely before noon, then a slight chance of showers and thunderstorms after 4pm.  Mostly cloudy, then gradually becoming sunny, with a high near 89. Heat index values as high as 98. Calm wind becoming south around 5 mph in the afternoon.  Chance of precipitation is 60%.

    High: 89 °F

    Showers
    Likely then
    Slight Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of showers and thunderstorms.  Mostly cloudy, with a low around 71. Northwest wind around 5 mph becoming northeast after midnight.  Chance of precipitation is 50%.

    Low: 71 °F

    Chance
    T-storms then
    Chance
    Showers

  • Friday

    Friday: A chance of showers, with thunderstorms also possible after 8am.  Mostly sunny, with a high near 88. Calm wind becoming west around 5 mph.  Chance of precipitation is 50%.

    High: 88 °F

    Chance
    Showers then
    Chance
    T-storms

  • Friday Night

    Friday Night: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am.  Partly cloudy, with a low around 70. Calm wind.  Chance of precipitation is 30%.

    Low: 70 °F

    Chance
    T-storms then
    Slight Chance
    Showers

  • Saturday

    Saturday: Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Partly cloudy, with a low around 68.

    Low: 68 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly clear, with a low around 69. Calm wind.
Wednesday
Patchy fog between 7am and 8am. Otherwise, sunny and hot, with a high near 91. Heat index values as high as 96. Calm wind.
Wednesday Night
Partly cloudy, with a low around 72. Calm wind.
Thursday
Showers and thunderstorms likely before noon, then a slight chance of showers and thunderstorms after 4pm. Mostly cloudy, then gradually becoming sunny, with a high near 89. Heat index values as high as 98. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 60%.
Thursday Night
A chance of showers and thunderstorms. Mostly cloudy, with a low around 71. Northwest wind around 5 mph becoming northeast after midnight. Chance of precipitation is 50%.
Friday
A chance of showers, with thunderstorms also possible after 8am. Mostly sunny, with a high near 88. Calm wind becoming west around 5 mph. Chance of precipitation is 50%.
Friday Night
A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and 2am. Partly cloudy, with a low around 70. Calm wind. Chance of precipitation is 30%.
Saturday
Mostly sunny, with a high near 89.
Saturday Night
Partly cloudy, with a low around 68.
Sunday
Mostly sunny, with a high near 88.
Sunday Night
Partly cloudy, with a low around 67.
Monday
Mostly sunny, with a high near 88.
Monday Night
Partly cloudy, with a low around 68.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
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ABOUT THIS FORECAST

 
Point Forecast:
3 Miles WNW Louisville TN
 35.83°N 84.09°W (Elev. 892 ft)
2:26 am EDT Aug 19, 2026
3am EDT Aug 19, 2026-6pm EDT Aug 25, 2026
 
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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