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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 10:31 pm CDT Sep 13, 2026
 
Tonight

Tonight: Patchy fog after 5am.  Otherwise, mostly clear, with a low around 68. Calm wind.
Low: 68 °F
Monday

Monday: Sunny, with a high near 91. Northeast wind around 5 mph.
High: 91 °F
Monday
Night
Monday Night: Mostly clear, with a low around 68. Northeast wind around 5 mph becoming calm  after midnight.
Low: 68 °F
Tuesday

Tuesday: Sunny, with a high near 96. Heat index values as high as 102. South wind around 5 mph.
High: 96 °F
Tuesday
Night
Tuesday Night: Mostly clear, with a low around 72. South wind around 5 mph.
Low: 72 °F
Wednesday

Wednesday: Sunny, with a high near 95. South wind around 5 mph becoming calm  in the afternoon.
High: 95 °F
Wednesday
Night
Wednesday Night: Mostly clear, with a low around 70. Calm wind.
Low: 70 °F
Thursday

Thursday: Sunny, with a high near 95. Calm wind becoming southwest around 5 mph.
High: 95 °F
Thursday
Night
Thursday Night: Mostly clear, with a low around 69. Calm wind.
Low: 69 °F
Patchy Fog
Sunny
Mostly Clear
Sunny
Mostly Clear
Sunny
Mostly Clear
Sunny
Mostly Clear

Heat Advisory
 

Tonight
 
Patchy fog after 5am. Otherwise, mostly clear, with a low around 68. Calm wind.
Monday
 
Sunny, with a high near 91. Northeast wind around 5 mph.
Monday Night
 
Mostly clear, with a low around 68. Northeast wind around 5 mph becoming calm after midnight.
Tuesday
 
Sunny, with a high near 96. Heat index values as high as 102. South wind around 5 mph.
Tuesday Night
 
Mostly clear, with a low around 72. South wind around 5 mph.
Wednesday
 
Sunny, with a high near 95. South wind around 5 mph becoming calm in the afternoon.
Wednesday Night
 
Mostly clear, with a low around 70. Calm wind.
Thursday
 
Sunny, with a high near 95. Calm wind becoming southwest around 5 mph.
Thursday Night
 
Mostly clear, with a low around 69. Calm wind.
Friday
 
Sunny, with a high near 94.
Friday Night
 
Mostly clear, with a low around 68.
Saturday
 
Sunny, with a high near 94.
Saturday Night
 
Partly cloudy, with a low around 68.
Sunday
 
A 30 percent chance of showers. Mostly sunny, with a high near 90.

 

Forecast from NOAA-NWS for Watertown TN.