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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 5:06 am CDT Sep 18, 2026
 
This
Afternoon
This Afternoon: Sunny, with a high near 96. Heat index values as high as 102. North wind around 5 mph.
High: 96 °F		 Tonight

Tonight: Mostly clear, with a low around 70. Calm wind.
Low: 70 °F		 Saturday

Saturday: A slight chance of showers and thunderstorms between 3pm and 4pm. Sunny, with a high near 96. Heat index values as high as 102. Calm wind becoming northwest around 5 mph. Chance of precipitation is 20%.
High: 96 °F		 Saturday
Night
Saturday Night: Partly cloudy, with a low around 70. Calm wind becoming south around 5 mph.
Low: 70 °F		 Sunday

Sunday: Mostly sunny, with a high near 95. South wind around 5 mph becoming west southwest in the afternoon.
High: 95 °F		 Sunday
Night
Sunday Night: Partly cloudy, with a low around 70. Calm wind becoming south around 5 mph.
Low: 70 °F		 Monday

Monday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. South wind around 5 mph becoming west southwest in the afternoon.
High: 94 °F		 Monday
Night
Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 67. South wind around 5 mph becoming east southeast in the evening. Chance of precipitation is 50%.
Low: 67 °F		 Tuesday

Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. Light and variable wind becoming northwest 5 to 10 mph in the morning. Chance of precipitation is 50%.
High: 88 °F
Sunny

 Mostly Clear

 Sunny then
Slight Chance
T-storms
 Partly Cloudy

 Mostly Sunny

 Partly Cloudy

 Mostly Sunny
then Slight
Chance
T-storms
 Chance
T-storms

 Slight Chance
Showers then
Chance
T-storms

Heat Advisory
 

This Afternoon
 
 Sunny, with a high near 96. Heat index values as high as 102. North wind around 5 mph.
Tonight
 
 Mostly clear, with a low around 70. Calm wind.
Saturday
 
 A slight chance of showers and thunderstorms between 3pm and 4pm. Sunny, with a high near 96. Heat index values as high as 102. Calm wind becoming northwest around 5 mph. Chance of precipitation is 20%.
Saturday Night
 
 Partly cloudy, with a low around 70. Calm wind becoming south around 5 mph.
Sunday
 
 Mostly sunny, with a high near 95. South wind around 5 mph becoming west southwest in the afternoon.
Sunday Night
 
 Partly cloudy, with a low around 70. Calm wind becoming south around 5 mph.
Monday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. South wind around 5 mph becoming west southwest in the afternoon.
Monday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 67. South wind around 5 mph becoming east southeast in the evening. Chance of precipitation is 50%.
Tuesday
 
 A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 88. Light and variable wind becoming northwest 5 to 10 mph in the morning. Chance of precipitation is 50%.
Tuesday Night
 
 A 20 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 62.
Wednesday
 
 A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 82.
Wednesday Night
 
 Partly cloudy, with a low around 59.
Thursday
 
 Mostly sunny, with a high near 80.

 

Forecast from NOAA-NWS for Watertown TN.