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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 1:31 pm CDT Aug 13, 2026
 
This
Afternoon
This Afternoon: A 20 percent chance of showers and thunderstorms after 3pm.  Mostly sunny, with a high near 94. Heat index values as high as 105. West southwest wind around 5 mph.
High: 94 °F
Tonight

Tonight: Partly cloudy, with a low around 74. South wind around 5 mph.
Low: 74 °F
Friday

Friday: Sunny, with a high near 95. Heat index values as high as 107. West southwest wind around 5 mph.
High: 95 °F
Friday
Night
Friday Night: Partly cloudy, with a low around 75. West southwest wind around 5 mph becoming calm.
Low: 75 °F
Saturday

Saturday: Sunny, with a high near 96. Calm wind becoming west southwest around 5 mph in the afternoon.
High: 96 °F
Saturday
Night
Saturday Night: Mostly clear, with a low around 75. Calm wind becoming south southwest around 5 mph.
Low: 75 °F
Sunday

Sunday: Sunny and hot, with a high near 98. West southwest wind around 5 mph.
High: 98 °F
Sunday
Night
Sunday Night: Mostly clear, with a low around 75. Calm wind becoming south southwest around 5 mph.
Low: 75 °F
Monday

Monday: A 30 percent chance of showers and thunderstorms after 1pm.  Sunny, with a high near 96. South southwest wind 5 to 10 mph becoming west northwest in the afternoon.
High: 96 °F
Slight Chance
T-storms
Partly Cloudy

Sunny

Partly Cloudy

Sunny

Mostly Clear

Hot

Mostly Clear

Sunny then
Chance
T-storms

Heat Advisory
 

This Afternoon
 
A 20 percent chance of showers and thunderstorms after 3pm. Mostly sunny, with a high near 94. Heat index values as high as 105. West southwest wind around 5 mph.
Tonight
 
Partly cloudy, with a low around 74. South wind around 5 mph.
Friday
 
Sunny, with a high near 95. Heat index values as high as 107. West southwest wind around 5 mph.
Friday Night
 
Partly cloudy, with a low around 75. West southwest wind around 5 mph becoming calm.
Saturday
 
Sunny, with a high near 96. Calm wind becoming west southwest around 5 mph in the afternoon.
Saturday Night
 
Mostly clear, with a low around 75. Calm wind becoming south southwest around 5 mph.
Sunday
 
Sunny and hot, with a high near 98. West southwest wind around 5 mph.
Sunday Night
 
Mostly clear, with a low around 75. Calm wind becoming south southwest around 5 mph.
Monday
 
A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 96. South southwest wind 5 to 10 mph becoming west northwest in the afternoon.
Monday Night
 
A slight chance of showers and thunderstorms. Partly cloudy, with a low around 73. Chance of precipitation is 20%.
Tuesday
 
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Tuesday Night
 
Mostly clear, with a low around 71.
Wednesday
 
Sunny, with a high near 93.

 

Forecast from NOAA-NWS for Watertown TN.