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

Dangerous Heat and Heavy Rainfall into the Weekend

Hot temperatures and high humidity are forecast to continue across the mid-Mississippi Valley into this weekend. Heat Advisories remain in effect. Heavy to excessive rainfall occurring at times through the weekend could bring areas of flooding to parts of the northern Rockies, upper Midwest, central Great Lakes, and southern New England. Read More >

Hazardous Weather Conditions

Current conditions at

Tullahoma Regional Airport/William Northern Field (KTHA)

Lat: 35.38°NLon: 86.25°WElev: 1083ft.

Fair

86°F

30°C

Humidity 52%
Wind Speed Calm
Barometer NA
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index88°F (31°C)
Last update 18 Sep 6:55 pm CDT
Extended Forecast for

Lynchburg TN

Heat Advisory September 18, 07:06pm until September 19, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 18, 07:06pm until September 19, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Tonight

    Low: 71 °F

    Slight Chance
    Showers then
    Mostly Clear

  • Saturday

    Saturday: A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Increasing clouds and hot, with a high near 98. Heat index values as high as 102. Calm wind becoming north northwest around 5 mph.

    High: 98 °F

    Sunny then
    Chance
    Showers

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 70. Calm wind.

    Low: 70 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 97. Heat index values as high as 101. Calm wind becoming south around 5 mph.

    High: 97 °F

    Hot

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 69. Calm wind.

    Low: 69 °F

    Partly Cloudy

  • Monday

    Monday: A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96.

    High: 96 °F

    Mostly Sunny
    then Chance
    T-storms

  • Monday Night

    Monday Night: A 50 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 67.

    Low: 67 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 91. Chance of precipitation is 60%.

    High: 91 °F

    Slight Chance
    T-storms then
    Showers
    Likely

Detailed Forecast

Tonight
A 20 percent chance of showers before 9pm. Mostly clear, with a low around 71. Calm wind.
Saturday
A 30 percent chance of showers and thunderstorms, mainly between 4pm and 5pm. Increasing clouds and hot, with a high near 98. Heat index values as high as 102. Calm wind becoming north northwest around 5 mph.
Saturday Night
Mostly clear, with a low around 70. Calm wind.
Sunday
Sunny and hot, with a high near 97. Heat index values as high as 101. Calm wind becoming south around 5 mph.
Sunday Night
Partly cloudy, with a low around 69. Calm wind.
Monday
A 40 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 96.
Monday Night
A 50 percent chance of showers and thunderstorms, mainly before 1am. Partly cloudy, with a low around 67.
Tuesday
A slight chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 91. Chance of precipitation is 60%.
Tuesday Night
A chance of showers and thunderstorms before 1am, then a slight chance of showers. Partly cloudy, with a low around 64. Chance of precipitation is 40%.
Wednesday
A 30 percent chance of showers. Partly sunny, with a high near 85.
Wednesday Night
Partly cloudy, with a low around 60.
Thursday
Mostly sunny, with a high near 82.
Thursday Night
Partly cloudy, with a low around 59.
Friday
Mostly sunny, with a high near 83.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Lynchburg TN
 35.29°N 86.38°W (Elev. 997 ft)
Last Update:
6:50 pm CDT Sep 18, 2026
Forecast Valid:
7pm CDT Sep 18, 2026-6pm CDT Sep 25, 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