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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 10:26 pm CDT Sep 17, 2026
 
Overnight

Overnight: Clear, with a low around 72. Calm wind.
Low: 72 °F		 Friday

Friday: Sunny, with a high near 96. Heat index values as high as 104. Calm wind becoming north northwest around 5 mph in the afternoon.
High: 96 °F		 Friday
Night
Friday Night: Partly cloudy, with a low around 70. Calm wind.
Low: 70 °F		 Saturday

Saturday: Sunny, with a high near 95. Heat index values as high as 103. Calm wind becoming northwest around 5 mph in the afternoon.
High: 95 °F		 Saturday
Night
Saturday Night: Mostly clear, with a low around 70. Calm wind becoming south around 5 mph.
Low: 70 °F		 Sunday

Sunday: Mostly sunny, with a high near 95. South wind around 5 mph becoming west southwest in the afternoon.
High: 95 °F		 Sunday
Night
Sunday Night: Partly cloudy, with a low around 70. Calm wind becoming south around 5 mph.
Low: 70 °F		 Monday

Monday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. South wind around 5 mph becoming west southwest in the afternoon.
High: 94 °F		 Monday
Night
Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 67. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Low: 67 °F
Clear

 Sunny

 Partly Cloudy

 Sunny

 Mostly Clear

 Mostly Sunny

 Partly Cloudy

 Mostly Sunny
then Slight
Chance
T-storms
 Chance
Showers

Heat Advisory
 

Overnight
 
 Clear, with a low around 72. Calm wind.
Friday
 
 Sunny, with a high near 96. Heat index values as high as 104. Calm wind becoming north northwest around 5 mph in the afternoon.
Friday Night
 
 Partly cloudy, with a low around 70. Calm wind.
Saturday
 
 Sunny, with a high near 95. Heat index values as high as 103. Calm wind becoming northwest around 5 mph in the afternoon.
Saturday Night
 
 Mostly clear, with a low around 70. Calm wind becoming south around 5 mph.
Sunday
 
 Mostly sunny, with a high near 95. South wind around 5 mph becoming west southwest in the afternoon.
Sunday Night
 
 Partly cloudy, with a low around 70. Calm wind becoming south around 5 mph.
Monday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. South wind around 5 mph becoming west southwest in the afternoon.
Monday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 67. East wind around 5 mph becoming calm in the evening. Chance of precipitation is 40%.
Tuesday
 
 A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Chance of precipitation is 30%.
Tuesday Night
 
 A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 63.
Wednesday
 
 A 20 percent chance of showers. Mostly sunny, with a high near 85.
Wednesday Night
 
 Partly cloudy, with a low around 61.
Thursday
 
 Mostly sunny, with a high near 84.

 

Forecast from NOAA-NWS for Watertown TN.