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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 10:41 pm CDT Sep 8, 2026
 
Overnight

Overnight: Mostly clear, with a low around 69. South wind around 5 mph.
Low: 69 °F		 Wednesday

Wednesday: Sunny, with a high near 92. Heat index values as high as 97. South southwest wind 5 to 10 mph.
High: 92 °F		 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 70. South wind 5 to 10 mph.
Low: 70 °F		 Thursday

Thursday: A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. Heat index values as high as 99. Southwest wind around 10 mph.
High: 93 °F		 Thursday
Night
Thursday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 67. West wind around 5 mph becoming calm. Chance of precipitation is 60%.
Low: 67 °F		 Friday

Friday: A chance of showers, with thunderstorms also possible after 10am. Patchy fog before 9am. Otherwise, partly sunny, with a high near 89. Calm wind becoming south around 5 mph. Chance of precipitation is 40%.
High: 89 °F		 Friday
Night
Friday Night: A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 67. Calm wind.
Low: 67 °F		 Saturday

Saturday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 91. South southwest wind around 5 mph. Chance of precipitation is 30%.
High: 91 °F		 Saturday
Night
Saturday Night: A 20 percent chance of showers before 1am. Partly cloudy, with a low around 68. Calm wind becoming south southeast around 5 mph.
Low: 68 °F
Mostly Clear


 Sunny


 Mostly Clear


 Sunny then
Chance
T-storms

 Showers
Likely and
Patchy Fog

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

 Chance
Showers then
Chance
T-storms
 Slight Chance
Showers

 

Overnight
 
 Mostly clear, with a low around 69. South wind around 5 mph.
Wednesday
 
 Sunny, with a high near 92. Heat index values as high as 97. South southwest wind 5 to 10 mph.
Wednesday Night
 
 Mostly clear, with a low around 70. South wind 5 to 10 mph.
Thursday
 
 A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93. Heat index values as high as 99. Southwest wind around 10 mph.
Thursday Night
 
 Showers likely and possibly a thunderstorm before 1am, then a chance of showers. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 67. West wind around 5 mph becoming calm. Chance of precipitation is 60%.
Friday
 
 A chance of showers, with thunderstorms also possible after 10am. Patchy fog before 9am. Otherwise, partly sunny, with a high near 89. Calm wind becoming south around 5 mph. Chance of precipitation is 40%.
Friday Night
 
 A 20 percent chance of showers and thunderstorms before 1am. Mostly cloudy, with a low around 67. Calm wind.
Saturday
 
 A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 91. South southwest wind around 5 mph. Chance of precipitation is 30%.
Saturday Night
 
 A 20 percent chance of showers before 1am. Partly cloudy, with a low around 68. Calm wind becoming south southeast around 5 mph.
Sunday
 
 A slight chance of showers, with thunderstorms also possible after 1pm. Sunny, with a high near 92. Chance of precipitation is 20%.
Sunday Night
 
 Mostly clear, with a low around 67.
Monday
 
 A 20 percent chance of showers and thunderstorms. Sunny, with a high near 91.
Monday Night
 
 Mostly clear, with a low around 68.
Tuesday
 
 A 30 percent chance of showers and thunderstorms. Sunny, with a high near 92.

 

Forecast from NOAA-NWS for Watertown TN.