National Weather Service Forecast for: Lebanon TN
Issued by: National Weather Service Nashville, TN
Updated: 1:31 am CDT Aug 20, 2026
 
Overnight

Overnight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 71. North northwest wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Heavy Rain


 Thursday

Thursday: Showers and thunderstorms likely, mainly before 1pm. Partly sunny, with a high near 90. Heat index values as high as 103. South wind around 5 mph becoming west in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Showers
Likely then
Chance
T-storms
 Thursday
Night
Thursday Night: A 30 percent chance of showers and thunderstorms, mainly before 10pm. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 70. North wind around 5 mph becoming calm.
Chance
T-storms and
Patchy Fog
then Patchy
Fog
 Friday

Friday: Areas of fog before 9am. Otherwise, mostly sunny, with a high near 89. Heat index values as high as 98. Calm wind becoming north northwest around 5 mph in the afternoon.
Areas Fog
then Mostly
Sunny

 Friday
Night
Friday Night: Patchy fog after midnight. Otherwise, mostly clear, with a low around 67. North wind around 5 mph becoming calm.
Mostly Clear
then Patchy
Fog

 Saturday

Saturday: Areas of fog before 8am. Otherwise, sunny, with a high near 91. Light and variable wind becoming northwest 5 to 10 mph in the afternoon.
Areas Fog
then Sunny

 Saturday
Night
Saturday Night: Patchy fog after 3am. Otherwise, mostly clear, with a low around 66. North northwest wind around 5 mph becoming calm in the evening.
Mostly Clear
then Patchy
Fog

 Sunday

Sunday: Patchy fog before 8am. Otherwise, sunny, with a high near 88. Light north wind increasing to 5 to 10 mph in the afternoon.
Patchy Fog
then Sunny

 Sunday
Night
Sunday Night: Mostly clear, with a low around 63. North wind around 5 mph becoming calm in the evening.
Mostly Clear
Lo 71 °F Hi 90 °F Lo 70 °F Hi 89 °F Lo 67 °F Hi 91 °F Lo 66 °F Hi 88 °F Lo 63 °F

Severe Thunderstorm Watch
 

Overnight
 
 A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Some of the storms could produce heavy rainfall. Mostly cloudy, with a low around 71. North northwest wind around 5 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
 
 Showers and thunderstorms likely, mainly before 1pm. Partly sunny, with a high near 90. Heat index values as high as 103. South wind around 5 mph becoming west in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
 
 A 30 percent chance of showers and thunderstorms, mainly before 10pm. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 70. North wind around 5 mph becoming calm.
Friday
 
 Areas of fog before 9am. Otherwise, mostly sunny, with a high near 89. Heat index values as high as 98. Calm wind becoming north northwest around 5 mph in the afternoon.
Friday Night
 
 Patchy fog after midnight. Otherwise, mostly clear, with a low around 67. North wind around 5 mph becoming calm.
Saturday
 
 Areas of fog before 8am. Otherwise, sunny, with a high near 91. Light and variable wind becoming northwest 5 to 10 mph in the afternoon.
Saturday Night
 
 Patchy fog after 3am. Otherwise, mostly clear, with a low around 66. North northwest wind around 5 mph becoming calm in the evening.
Sunday
 
 Patchy fog before 8am. Otherwise, sunny, with a high near 88. Light north wind increasing to 5 to 10 mph in the afternoon.
Sunday Night
 
 Mostly clear, with a low around 63. North wind around 5 mph becoming calm in the evening.
Monday
 
 Mostly sunny, with a high near 87.
Monday Night
 
 Partly cloudy, with a low around 64.
Tuesday
 
 Sunny, with a high near 89.
Tuesday Night
 
 A 20 percent chance of showers. Partly cloudy, with a low around 67.
Wednesday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.

 

Forecast from NOAA-NWS for Lebanon TN.