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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 10:26 pm CDT Sep 16, 2026
 
Tonight

Tonight: 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 106. Calm wind becoming north around 5 mph in the afternoon.
High: 97 °F
Thursday
Night
Thursday Night: Mostly clear, with a low around 72. Calm wind.
Low: 72 °F
Friday

Friday: Sunny and hot, with a high near 97. Heat index values as high as 105. Calm wind becoming north around 5 mph in the afternoon.
High: 97 °F
Friday
Night
Friday Night: Mostly clear, with a low around 70. East northeast wind around 5 mph becoming calm.
Low: 70 °F
Saturday

Saturday: Sunny, with a high near 96. Calm wind becoming west around 5 mph.
High: 96 °F
Saturday
Night
Saturday Night: Partly cloudy, with a low around 72. Calm wind becoming south around 5 mph after midnight.
Low: 72 °F
Sunday

Sunday: Sunny, with a high near 96. South wind 5 to 10 mph becoming west in the afternoon.
High: 96 °F
Sunday
Night
Sunday Night: Partly cloudy, with a low around 71. South wind around 5 mph.
Low: 71 °F
Mostly Clear
Hot
Mostly Clear
Hot
Mostly Clear
Sunny
Partly Cloudy
Sunny
Partly Cloudy

Heat Advisory
 

Tonight
 
Mostly clear, with a low around 72. Calm wind.
Thursday
 
Sunny and hot, with a high near 97. Heat index values as high as 106. Calm wind becoming north around 5 mph in the afternoon.
Thursday Night
 
Mostly clear, with a low around 72. Calm wind.
Friday
 
Sunny and hot, with a high near 97. Heat index values as high as 105. Calm wind becoming north around 5 mph in the afternoon.
Friday Night
 
Mostly clear, with a low around 70. East northeast wind around 5 mph becoming calm.
Saturday
 
Sunny, with a high near 96. 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
 
Sunny, with a high near 96. South wind 5 to 10 mph becoming west in the afternoon.
Sunday Night
 
Partly cloudy, with a low around 71. South wind around 5 mph.
Monday
 
A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94.
Monday Night
 
A 30 percent chance of showers. Partly cloudy, with a low around 68.
Tuesday
 
A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Tuesday Night
 
A 20 percent chance of showers. Partly cloudy, with a low around 66.
Wednesday
 
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.

 

Forecast from NOAA-NWS for Watertown TN.