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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 1:31 am CDT Sep 3, 2026
 
Overnight

Overnight: Clear, with a low around 75. Calm wind.
Low: 75 °F
Thursday

Thursday: Sunny and hot, with a high near 98. Heat index values as high as 105. Calm wind.
High: 98 °F
Thursday
Night
Thursday Night: Mostly clear, with a low around 75. Calm wind.
Low: 75 °F
Friday

Friday: Sunny and hot, with a high near 98. Heat index values as high as 106. Calm wind becoming north around 5 mph.
High: 98 °F
Friday
Night
Friday Night: Mostly clear, with a low around 73. Calm wind.
Low: 73 °F
Saturday

Saturday: Sunny, with a high near 96. Calm wind becoming north around 5 mph in the afternoon.
High: 96 °F
Saturday
Night
Saturday Night: Partly cloudy, with a low around 71. Calm wind.
Low: 71 °F
Sunday

Sunday: Patchy fog before 8am.  Otherwise, sunny, with a high near 94. Light east northeast wind becoming north 5 to 10 mph in the afternoon.
High: 94 °F
Sunday
Night
Sunday Night: Mostly clear, with a low around 67. East northeast wind around 5 mph.
Low: 67 °F
Clear
Hot
Mostly Clear
Hot
Mostly Clear
Sunny
Partly Cloudy
Patchy Fog
then Sunny
Mostly Clear

Heat Advisory
Air Quality Alert
 

Overnight
 
Clear, with a low around 75. Calm wind.
Thursday
 
Sunny and hot, with a high near 98. Heat index values as high as 105. Calm wind.
Thursday Night
 
Mostly clear, with a low around 75. Calm wind.
Friday
 
Sunny and hot, with a high near 98. Heat index values as high as 106. Calm wind becoming north around 5 mph.
Friday Night
 
Mostly clear, with a low around 73. Calm wind.
Saturday
 
Sunny, with a high near 96. Calm wind becoming north around 5 mph in the afternoon.
Saturday Night
 
Partly cloudy, with a low around 71. Calm wind.
Sunday
 
Patchy fog before 8am. Otherwise, sunny, with a high near 94. Light east northeast wind becoming north 5 to 10 mph in the afternoon.
Sunday Night
 
Mostly clear, with a low around 67. East northeast wind around 5 mph.
Labor Day
 
Sunny, with a high near 92.
Monday Night
 
Mostly clear, with a low around 69.
Tuesday
 
Sunny, with a high near 92.
Tuesday Night
 
Mostly clear, with a low around 70.
Wednesday
 
Sunny, with a high near 93.

 

Forecast from NOAA-NWS for Watertown TN.