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

Overnight: Mostly clear, with a low around 74. Calm wind.
Low: 74 °F
Friday

Friday: A 20 percent chance of showers and thunderstorms after 3pm.  Sunny and hot, with a high near 98. Heat index values as high as 107. Calm wind.
High: 98 °F
Friday
Night
Friday Night: Mostly clear, with a low around 74. Calm wind.
Low: 74 °F
Saturday

Saturday: A slight chance of showers and thunderstorms between 2pm and 4pm.  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.  Chance of precipitation is 20%.
High: 97 °F
Saturday
Night
Saturday Night: Mostly clear, with a low around 71. Calm wind.
Low: 71 °F
Sunday

Sunday: Patchy fog before 7am.  Otherwise, sunny, with a high near 93. Light north wind increasing to 5 to 10 mph in the afternoon.
High: 93 °F
Sunday
Night
Sunday Night: Mostly clear, with a low around 67. Northeast wind 5 to 10 mph.
Low: 67 °F
Labor
Day
Labor Day: Sunny, with a high near 91. East northeast wind around 5 mph.
High: 91 °F
Monday
Night
Monday Night: Mostly clear, with a low around 69. East wind around 5 mph becoming south southeast after midnight.
Low: 69 °F
Mostly Clear

Sunny then
Slight Chance
T-storms
Mostly Clear

Sunny then
Slight Chance
T-storms
Mostly Clear

Patchy Fog
then Sunny
Mostly Clear

Sunny

Mostly Clear

Heat Advisory
 

Overnight
 
Mostly clear, with a low around 74. Calm wind.
Friday
 
A 20 percent chance of showers and thunderstorms after 3pm. Sunny and hot, with a high near 98. Heat index values as high as 107. Calm wind.
Friday Night
 
Mostly clear, with a low around 74. Calm wind.
Saturday
 
A slight chance of showers and thunderstorms between 2pm and 4pm. 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. Chance of precipitation is 20%.
Saturday Night
 
Mostly clear, with a low around 71. Calm wind.
Sunday
 
Patchy fog before 7am. Otherwise, sunny, with a high near 93. Light north wind increasing to 5 to 10 mph in the afternoon.
Sunday Night
 
Mostly clear, with a low around 67. Northeast wind 5 to 10 mph.
Labor Day
 
Sunny, with a high near 91. East northeast wind around 5 mph.
Monday Night
 
Mostly clear, with a low around 69. East wind around 5 mph becoming south southeast after midnight.
Tuesday
 
Sunny, with a high near 92.
Tuesday Night
 
Mostly clear, with a low around 70.
Wednesday
 
Sunny, with a high near 93.
Wednesday Night
 
Mostly clear, with a low around 72.
Thursday
 
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 94.

 

Forecast from NOAA-NWS for Watertown TN.