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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 1:31 pm CDT Sep 4, 2026
 
Tonight

Tonight: Mostly clear, with a low around 74. Calm wind.
Low: 74 °F
Saturday

Saturday: A slight chance of showers, then a chance of showers and thunderstorms after 2pm.  Sunny and hot, with a high near 97. Heat index values as high as 106. Calm wind becoming north northwest around 5 mph in the afternoon.  Chance of precipitation is 30%.
High: 97 °F
Saturday
Night
Saturday Night: Mostly clear, with a low around 72. Calm wind.
Low: 72 °F
Sunday

Sunday: Sunny, with a high near 93. Heat index values as high as 100. Light north wind increasing to 5 to 10 mph in the morning.
High: 93 °F
Sunday
Night
Sunday Night: Mostly clear, with a low around 65. Northeast wind 5 to 10 mph.
Low: 65 °F
Labor
Day
Labor Day: Sunny, with a high near 91. East northeast wind around 5 mph.
High: 91 °F
Monday
Night
Monday Night: A 20 percent chance of showers before 1am.  Mostly clear, with a low around 69. East wind around 5 mph becoming south southeast after midnight.
Low: 69 °F
Tuesday

Tuesday: Sunny, with a high near 92. South wind 5 to 10 mph.
High: 92 °F
Tuesday
Night
Tuesday Night: Mostly clear, with a low around 70. South southeast wind around 5 mph.
Low: 70 °F
Mostly Clear

Slight Chance
Showers then
Chance
T-storms
Mostly Clear

Sunny

Mostly Clear

Sunny

Slight Chance
Showers

Sunny

Mostly Clear

Heat Advisory
 

Tonight
 
Mostly clear, with a low around 74. Calm wind.
Saturday
 
A slight chance of showers, then a chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 97. Heat index values as high as 106. Calm wind becoming north northwest around 5 mph in the afternoon. Chance of precipitation is 30%.
Saturday Night
 
Mostly clear, with a low around 72. Calm wind.
Sunday
 
Sunny, with a high near 93. Heat index values as high as 100. Light north wind increasing to 5 to 10 mph in the morning.
Sunday Night
 
Mostly clear, with a low around 65. Northeast wind 5 to 10 mph.
Labor Day
 
Sunny, with a high near 91. East northeast wind around 5 mph.
Monday Night
 
A 20 percent chance of showers before 1am. Mostly clear, with a low around 69. East wind around 5 mph becoming south southeast after midnight.
Tuesday
 
Sunny, with a high near 92. South wind 5 to 10 mph.
Tuesday Night
 
Mostly clear, with a low around 70. South southeast wind around 5 mph.
Wednesday
 
Sunny, with a high near 93.
Wednesday Night
 
Mostly clear, with a low around 71.
Thursday
 
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 94.
Thursday Night
 
Partly cloudy, with a low around 68.
Friday
 
A 20 percent chance of showers. Sunny, with a high near 91.

 

Forecast from NOAA-NWS for Watertown TN.