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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 7:21 pm CDT Jul 20, 2026
 
Overnight

Overnight: Partly cloudy, with a low around 74. Calm wind becoming south southwest around 5 mph.
Low: 74 °F		 Tuesday

Tuesday: A slight chance of showers and thunderstorms before 4pm, then a slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 92. Heat index values as high as 107. South southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
High: 92 °F		 Tuesday
Night
Tuesday Night: Showers and thunderstorms before 4am, then a chance of showers. Low around 72. Southwest wind around 5 mph becoming calm after midnight. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Low: 72 °F		 Wednesday

Wednesday: A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 86. Light west wind becoming north northwest 5 to 10 mph in the morning. Chance of precipitation is 20%.
High: 86 °F		 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 64. North northeast wind 5 to 10 mph.
Low: 64 °F		 Thursday

Thursday: Mostly sunny, with a high near 82. North northeast wind 5 to 10 mph.
High: 82 °F		 Thursday
Night
Thursday Night: Partly cloudy, with a low around 63. North northeast wind around 5 mph becoming calm after midnight.
Low: 63 °F		 Friday

Friday: Partly sunny, with a high near 84. Calm wind becoming north northeast around 5 mph.
High: 84 °F		 Friday
Night
Friday Night: A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 68. North wind around 5 mph becoming calm.
Low: 68 °F
Partly Cloudy

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

 Slight Chance
T-storms

 Partly Cloudy

 Mostly Sunny

 Partly Cloudy

 Partly Sunny

 Mostly Cloudy
then Chance
Showers

Heat Advisory
 

Overnight
 
 Partly cloudy, with a low around 74. Calm wind becoming south southwest around 5 mph.
Tuesday
 
 A slight chance of showers and thunderstorms before 4pm, then a slight chance of showers and thunderstorms after 5pm. Mostly sunny, with a high near 92. Heat index values as high as 107. South southwest wind 5 to 10 mph, with gusts as high as 20 mph. Chance of precipitation is 20%.
Tuesday Night
 
 Showers and thunderstorms before 4am, then a chance of showers. Low around 72. Southwest wind around 5 mph becoming calm after midnight. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Wednesday
 
 A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm. Mostly cloudy, then gradually becoming sunny, with a high near 86. Light west wind becoming north northwest 5 to 10 mph in the morning. Chance of precipitation is 20%.
Wednesday Night
 
 Partly cloudy, with a low around 64. North northeast wind 5 to 10 mph.
Thursday
 
 Mostly sunny, with a high near 82. North northeast wind 5 to 10 mph.
Thursday Night
 
 Partly cloudy, with a low around 63. North northeast wind around 5 mph becoming calm after midnight.
Friday
 
 Partly sunny, with a high near 84. Calm wind becoming north northeast around 5 mph.
Friday Night
 
 A 30 percent chance of showers after 1am. Mostly cloudy, with a low around 68. North wind around 5 mph becoming calm.
Saturday
 
 A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 85. Chance of precipitation is 40%.
Saturday Night
 
 A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 70.
Sunday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Sunday Night
 
 Mostly clear, with a low around 71.
Monday
 
 A 20 percent chance of showers and thunderstorms. Sunny, with a high near 92.

 

Forecast from NOAA-NWS for Watertown TN.