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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 11:36 am CDT Aug 6, 2026
 
This
Afternoon
This Afternoon: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. Heat index values as high as 99. West southwest wind around 5 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
High: 90 °F		 Tonight

Tonight: A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 71. South southeast wind around 5 mph.
Low: 71 °F		 Friday

Friday: A 30 percent chance of showers and thunderstorms, mainly between 1pm and 2pm. Mostly sunny, with a high near 90. Heat index values as high as 98. South southwest wind around 5 mph.
High: 90 °F		 Friday
Night
Friday Night: A 30 percent chance of showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 72. South wind around 5 mph.
Low: 72 °F		 Saturday

Saturday: A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 90. West southwest wind around 5 mph. Chance of precipitation is 50%.
High: 90 °F		 Saturday
Night
Saturday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 71. Calm wind. Chance of precipitation is 20%.
Low: 71 °F		 Sunday

Sunday: Mostly sunny, with a high near 91. Calm wind becoming southwest around 5 mph.
High: 91 °F		 Sunday
Night
Sunday Night: A slight chance of showers and thunderstorms. Mostly clear, with a low around 71. Calm wind becoming south around 5 mph. Chance of precipitation is 20%.
Low: 71 °F		 Monday

Monday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. South southwest wind around 5 mph.
High: 91 °F
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This Afternoon
 
 A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. Heat index values as high as 99. West southwest wind around 5 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
 
 A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 71. South southeast wind around 5 mph.
Friday
 
 A 30 percent chance of showers and thunderstorms, mainly between 1pm and 2pm. Mostly sunny, with a high near 90. Heat index values as high as 98. South southwest wind around 5 mph.
Friday Night
 
 A 30 percent chance of showers and thunderstorms, mainly after 5am. Partly cloudy, with a low around 72. South wind around 5 mph.
Saturday
 
 A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 90. West southwest wind around 5 mph. Chance of precipitation is 50%.
Saturday Night
 
 A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Partly cloudy, with a low around 71. Calm wind. Chance of precipitation is 20%.
Sunday
 
 Mostly sunny, with a high near 91. Calm wind becoming southwest around 5 mph.
Sunday Night
 
 A slight chance of showers and thunderstorms. Mostly clear, with a low around 71. Calm wind becoming south around 5 mph. Chance of precipitation is 20%.
Monday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91. South southwest wind around 5 mph.
Monday Night
 
 Partly cloudy, with a low around 73.
Tuesday
 
 Showers and thunderstorms likely. Mostly sunny, with a high near 91. Chance of precipitation is 60%.
Tuesday Night
 
 A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Wednesday
 
 Showers and thunderstorms likely. Mostly sunny, with a high near 89. Chance of precipitation is 60%.

 

Forecast from NOAA-NWS for Watertown TN.