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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 2:11 pm CDT Sep 2, 2026
 
This
Afternoon
This Afternoon: Sunny and hot, with a high near 97. Heat index values as high as 106. Calm wind.
High: 97 °F
Tonight

Tonight: 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 106. Calm wind.
High: 98 °F
Thursday
Night
Thursday Night: Mostly clear, with a low around 74. Calm wind.
Low: 74 °F
Friday

Friday: Sunny and hot, with a high near 98. Calm wind.
High: 98 °F
Friday
Night
Friday Night: Mostly clear, with a low around 73. Calm wind.
Low: 73 °F
Saturday

Saturday: A 20 percent chance of showers and thunderstorms after 1pm.  Sunny, with a high near 96. Calm wind becoming north around 5 mph.
High: 96 °F
Saturday
Night
Saturday Night: Partly cloudy, with a low around 71. Calm wind.
Low: 71 °F
Sunday

Sunday: Sunny, with a high near 94. Light east northeast wind becoming north northeast 5 to 10 mph in the afternoon.
High: 94 °F
Hot

Clear

Hot

Mostly Clear

Hot

Mostly Clear

Sunny then
Slight Chance
T-storms
Partly Cloudy

Sunny

Heat Advisory
Air Quality Alert
 

This Afternoon
 
Sunny and hot, with a high near 97. Heat index values as high as 106. Calm wind.
Tonight
 
Clear, with a low around 75. Calm wind.
Thursday
 
Sunny and hot, with a high near 98. Heat index values as high as 106. Calm wind.
Thursday Night
 
Mostly clear, with a low around 74. Calm wind.
Friday
 
Sunny and hot, with a high near 98. Calm wind.
Friday Night
 
Mostly clear, with a low around 73. Calm wind.
Saturday
 
A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96. Calm wind becoming north around 5 mph.
Saturday Night
 
Partly cloudy, with a low around 71. Calm wind.
Sunday
 
Sunny, with a high near 94. Light east northeast wind becoming north northeast 5 to 10 mph in the afternoon.
Sunday Night
 
Mostly clear, with a low around 69.
Labor Day
 
Sunny, with a high near 93.
Monday Night
 
Partly cloudy, with a low around 70.
Tuesday
 
Mostly sunny, with a high near 92.

 

Forecast from NOAA-NWS for Watertown TN.