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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 1:31 pm CDT Sep 19, 2026
 
This
Afternoon
This Afternoon: A 20 percent chance of showers and thunderstorms. Sunny and hot, with a high near 97. Heat index values as high as 100. Northwest wind around 5 mph.
High: 97 °F		 Tonight

Tonight: Mostly clear, with a low around 71. South wind around 5 mph.
Low: 71 °F		 Sunday

Sunday: A 20 percent chance of showers after 4pm. Sunny, with a high near 96. Heat index values as high as 100. South wind around 5 mph becoming west in the afternoon.
High: 96 °F		 Sunday
Night
Sunday Night: Partly cloudy, with a low around 71. Calm wind becoming south around 5 mph.
Low: 71 °F		 Monday

Monday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. South wind around 5 mph becoming northwest in the afternoon.
High: 95 °F		 Monday
Night
Monday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 66. East wind around 5 mph becoming calm. Chance of precipitation is 40%.
Low: 66 °F		 Tuesday

Tuesday: A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 89. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 60%.
High: 89 °F		 Tuesday
Night
Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 63. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.
Low: 63 °F		 Wednesday

Wednesday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 82. Calm wind becoming northwest around 5 mph in the morning. Chance of precipitation is 50%.
High: 82 °F
Slight Chance
T-storms

 Mostly Clear

 Sunny then
Slight Chance
Showers
 Partly Cloudy

 Sunny then
Slight Chance
T-storms
 Chance
Showers

 Slight Chance
T-storms then
Showers
Likely
 Chance
Showers

 Chance
Showers

Heat Advisory
 

This Afternoon
 
 A 20 percent chance of showers and thunderstorms. Sunny and hot, with a high near 97. Heat index values as high as 100. Northwest wind around 5 mph.
Tonight
 
 Mostly clear, with a low around 71. South wind around 5 mph.
Sunday
 
 A 20 percent chance of showers after 4pm. Sunny, with a high near 96. Heat index values as high as 100. South wind around 5 mph becoming west in the afternoon.
Sunday Night
 
 Partly cloudy, with a low around 71. Calm wind becoming south around 5 mph.
Monday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95. South wind around 5 mph becoming northwest in the afternoon.
Monday Night
 
 A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 66. East wind around 5 mph becoming calm. Chance of precipitation is 40%.
Tuesday
 
 A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 89. Calm wind becoming north around 5 mph in the afternoon. Chance of precipitation is 60%.
Tuesday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 63. Northeast wind around 5 mph becoming calm in the evening. Chance of precipitation is 50%.
Wednesday
 
 A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 82. Calm wind becoming northwest around 5 mph in the morning. Chance of precipitation is 50%.
Wednesday Night
 
 A 20 percent chance of showers before 1am. Partly cloudy, with a low around 60.
Thursday
 
 Mostly sunny, with a high near 80.
Thursday Night
 
 Partly cloudy, with a low around 58.
Friday
 
 Mostly sunny, with a high near 80.

 

Forecast from NOAA-NWS for Watertown TN.