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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 10:36 pm CDT Aug 5, 2026
 
Overnight

Overnight: Mostly clear, with a low around 70. Calm wind becoming south around 5 mph.
Low: 70 °F		 Thursday

Thursday: A slight chance of showers and thunderstorms between noon and 4pm. Mostly sunny, with a high near 90. Heat index values as high as 98. South wind around 5 mph becoming west in the afternoon. Chance of precipitation is 20%.
High: 90 °F		 Thursday
Night
Thursday Night: Partly cloudy, with a low around 71. South wind around 5 mph.
Low: 71 °F		 Friday

Friday: A 40 percent chance of showers and thunderstorms, mainly between 1pm and 5pm. Sunny, with a high near 91. Heat index values as high as 99. South southwest wind around 5 mph.
High: 91 °F		 Friday
Night
Friday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 71. South wind around 5 mph. Chance of precipitation is 30%.
Low: 71 °F		 Saturday

Saturday: A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 89. Southwest wind around 5 mph. Chance of precipitation is 50%.
High: 89 °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 70. Calm wind. Chance of precipitation is 20%.
Low: 70 °F		 Sunday

Sunday: Mostly sunny, with a high near 91. Calm wind becoming south southwest around 5 mph.
High: 91 °F		 Sunday
Night
Sunday Night: Mostly clear, with a low around 72. Calm wind becoming south around 5 mph.
Low: 72 °F
Mostly Clear

 Mostly Sunny
then Slight
Chance
T-storms
 Partly Cloudy

 Sunny then
Chance
T-storms
 Chance
T-storms then
Chance
Showers
 Chance
T-storms

 Slight Chance
T-storms then
Slight Chance
Showers
 Mostly Sunny

 Mostly Clear

 

Overnight
 
 Mostly clear, with a low around 70. Calm wind becoming south around 5 mph.
Thursday
 
 A slight chance of showers and thunderstorms between noon and 4pm. Mostly sunny, with a high near 90. Heat index values as high as 98. South wind around 5 mph becoming west in the afternoon. Chance of precipitation is 20%.
Thursday Night
 
 Partly cloudy, with a low around 71. South wind around 5 mph.
Friday
 
 A 40 percent chance of showers and thunderstorms, mainly between 1pm and 5pm. Sunny, with a high near 91. Heat index values as high as 99. South southwest wind around 5 mph.
Friday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 71. South wind around 5 mph. Chance of precipitation is 30%.
Saturday
 
 A chance of showers, with thunderstorms also possible after 10am. Mostly sunny, with a high near 89. 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 70. Calm wind. Chance of precipitation is 20%.
Sunday
 
 Mostly sunny, with a high near 91. Calm wind becoming south southwest around 5 mph.
Sunday Night
 
 Mostly clear, with a low around 72. Calm wind becoming south around 5 mph.
Monday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 91.
Monday Night
 
 Partly cloudy, with a low around 73.
Tuesday
 
 A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Tuesday Night
 
 A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 72.
Wednesday
 
 A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.

 

Forecast from NOAA-NWS for Watertown TN.