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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 1:31 am CDT Sep 10, 2026
 
Today

Today: A 50 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 93. Heat index values as high as 100. Southwest wind 5 to 10 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
High: 93 °F		 Tonight

Tonight: A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 69. South wind around 5 mph becoming calm in the evening.
Low: 69 °F		 Friday

Friday: A slight chance of showers, then a chance of showers and thunderstorms after 3pm. Patchy fog before 7am. Otherwise, mostly sunny, with a high near 92. Heat index values as high as 99. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 30%.
High: 92 °F		 Friday
Night
Friday Night: A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. North wind around 5 mph becoming calm. Chance of precipitation is 40%.
Low: 68 °F		 Saturday

Saturday: Showers likely, then showers and possibly a thunderstorm after 1pm. High near 88. South southwest wind around 5 mph. Chance of precipitation is 80%.
High: 88 °F		 Saturday
Night
Saturday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Patchy fog after 10pm. Otherwise, partly cloudy, with a low around 66. Calm wind. Chance of precipitation is 20%.
Low: 66 °F		 Sunday

Sunday: A 20 percent chance of showers and thunderstorms after 1pm. Patchy fog before 9am. Otherwise, sunny, with a high near 91. Calm wind becoming west northwest around 5 mph.
High: 91 °F		 Sunday
Night
Sunday Night: Mostly clear, with a low around 66. Calm wind.
Low: 66 °F		 Monday

Monday: Sunny, with a high near 92. Calm wind becoming south southwest around 5 mph in the afternoon.
High: 92 °F
Mostly Sunny
then Chance
Showers

 Chance
T-storms then
Chance
Showers
 Slight Chance
Showers and
Patchy Fog
then Chance
T-storms
 Chance
T-storms then
Chance
Showers
 Showers


 Slight Chance
T-storms and
Patchy Fog

 Patchy Fog
then Slight
Chance
T-storms
 Mostly Clear


 Sunny

 

Today
 
 A 50 percent chance of showers and thunderstorms, mainly after 2pm. Mostly sunny, with a high near 93. Heat index values as high as 100. Southwest wind 5 to 10 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tonight
 
 A 40 percent chance of showers and thunderstorms, mainly before 1am. Mostly cloudy, with a low around 69. South wind around 5 mph becoming calm in the evening.
Friday
 
 A slight chance of showers, then a chance of showers and thunderstorms after 3pm. Patchy fog before 7am. Otherwise, mostly sunny, with a high near 92. Heat index values as high as 99. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 30%.
Friday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. North wind around 5 mph becoming calm. Chance of precipitation is 40%.
Saturday
 
 Showers likely, then showers and possibly a thunderstorm after 1pm. High near 88. South southwest wind around 5 mph. Chance of precipitation is 80%.
Saturday Night
 
 A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Patchy fog after 10pm. Otherwise, partly cloudy, with a low around 66. Calm wind. Chance of precipitation is 20%.
Sunday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Patchy fog before 9am. Otherwise, sunny, with a high near 91. Calm wind becoming west northwest around 5 mph.
Sunday Night
 
 Mostly clear, with a low around 66. Calm wind.
Monday
 
 Sunny, with a high near 92. Calm wind becoming south southwest around 5 mph in the afternoon.
Monday Night
 
 Mostly clear, with a low around 66.
Tuesday
 
 A 20 percent chance of showers and thunderstorms. Sunny, with a high near 93.
Tuesday Night
 
 A 30 percent chance of showers. Mostly clear, with a low around 67.
Wednesday
 
 A 30 percent chance of showers and thunderstorms. Sunny, with a high near 92.

 

Forecast from NOAA-NWS for Watertown TN.