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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 7:16 pm CDT Sep 15, 2026
 
Tonight

Tonight: Clear, with a low around 73. South wind around 5 mph.
Low: 73 °F		 Wednesday

Wednesday: Sunny and hot, with a high near 97. Heat index values as high as 102. South southwest wind around 5 mph becoming calm in the afternoon.
High: 97 °F		 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 72. Calm wind.
Low: 72 °F		 Thursday

Thursday: Sunny and hot, with a high near 97. Heat index values as high as 103. Calm wind becoming northwest around 5 mph.
High: 97 °F		 Thursday
Night
Thursday Night: Mostly clear, with a low around 71. Calm wind.
Low: 71 °F		 Friday

Friday: Sunny, with a high near 96. Calm wind becoming north around 5 mph in the afternoon.
High: 96 °F		 Friday
Night
Friday Night: Mostly clear, with a low around 70. Northeast wind around 5 mph becoming calm in the evening.
Low: 70 °F		 Saturday

Saturday: Sunny, with a high near 95. Calm wind becoming west around 5 mph.
High: 95 °F		 Saturday
Night
Saturday Night: Partly cloudy, with a low around 72. Calm wind becoming south around 5 mph after midnight.
Low: 72 °F
Clear
 Hot
 Mostly Clear
 Hot
 Mostly Clear
 Sunny
 Mostly Clear
 Sunny
 Partly Cloudy

Heat Advisory
 

Tonight
 
 Clear, with a low around 73. South wind around 5 mph.
Wednesday
 
 Sunny and hot, with a high near 97. Heat index values as high as 102. South southwest wind around 5 mph becoming calm in the afternoon.
Wednesday Night
 
 Mostly clear, with a low around 72. Calm wind.
Thursday
 
 Sunny and hot, with a high near 97. Heat index values as high as 103. Calm wind becoming northwest around 5 mph.
Thursday Night
 
 Mostly clear, with a low around 71. Calm wind.
Friday
 
 Sunny, with a high near 96. Calm wind becoming north around 5 mph in the afternoon.
Friday Night
 
 Mostly clear, with a low around 70. Northeast wind around 5 mph becoming calm in the evening.
Saturday
 
 Sunny, with a high near 95. Calm wind becoming west around 5 mph.
Saturday Night
 
 Partly cloudy, with a low around 72. Calm wind becoming south around 5 mph after midnight.
Sunday
 
 Mostly sunny, with a high near 95.
Sunday Night
 
 Partly cloudy, with a low around 71.
Monday
 
 A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.
Monday Night
 
 A 40 percent chance of showers. Partly cloudy, with a low around 67.
Tuesday
 
 A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.

 

Forecast from NOAA-NWS for Watertown TN.