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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 1:31 pm CDT Aug 8, 2026
 
Tonight

Tonight: A 20 percent chance of showers and thunderstorms before 9pm. Mostly cloudy, with a low around 71. South wind around 5 mph becoming calm.
Low: 71 °F		 Sunday

Sunday: A 40 percent chance of showers and thunderstorms, mainly before 3pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 89. Heat index values as high as 99. Calm wind becoming south southeast around 5 mph in the afternoon.
High: 89 °F		 Sunday
Night
Sunday Night: A 10 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 72. South wind around 5 mph.
Low: 72 °F		 Monday

Monday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 91. Heat index values as high as 102. Southwest wind around 5 mph. Chance of precipitation is 30%.
High: 91 °F		 Monday
Night
Monday Night: Mostly clear, with a low around 72. South wind around 5 mph.
Low: 72 °F		 Tuesday

Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 91. Southwest wind around 5 mph.
High: 91 °F		 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 72. South wind around 5 mph.
Low: 72 °F		 Wednesday

Wednesday: A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. West southwest wind 5 to 10 mph.
High: 90 °F		 Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South southwest wind around 5 mph. Chance of precipitation is 50%.
Low: 73 °F
Slight Chance
T-storms then
Mostly Cloudy
 Chance
T-storms and
Patchy Fog
 Slight Chance
T-storms then
Partly Cloudy
 Chance
T-storms
 Mostly Clear

 Sunny then
Slight Chance
T-storms
 Mostly Clear

 Chance
T-storms
 Chance
Showers

Flash Flood Warning
 

Tonight
 
 A 20 percent chance of showers and thunderstorms before 9pm. Mostly cloudy, with a low around 71. South wind around 5 mph becoming calm.
Sunday
 
 A 40 percent chance of showers and thunderstorms, mainly before 3pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 89. Heat index values as high as 99. Calm wind becoming south southeast around 5 mph in the afternoon.
Sunday Night
 
 A 10 percent chance of showers and thunderstorms before 7pm. Mostly cloudy, with a low around 72. South wind around 5 mph.
Monday
 
 A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 91. Heat index values as high as 102. Southwest wind around 5 mph. Chance of precipitation is 30%.
Monday Night
 
 Mostly clear, with a low around 72. South wind around 5 mph.
Tuesday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 91. Southwest wind around 5 mph.
Tuesday Night
 
 Mostly clear, with a low around 72. South wind around 5 mph.
Wednesday
 
 A 50 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. West southwest wind 5 to 10 mph.
Wednesday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 73. South southwest wind around 5 mph. Chance of precipitation is 50%.
Thursday
 
 A 50 percent chance of showers and thunderstorms, mainly after 1pm. Partly sunny, with a high near 89.
Thursday Night
 
 A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Friday
 
 A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.
Friday Night
 
 A 20 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 72.
Saturday
 
 A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 89.

 

Forecast from NOAA-NWS for Watertown TN.