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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 5:51 am CDT Sep 11, 2026
 
Today

Today: Mostly sunny, with a high near 93. Heat index values as high as 100. Calm wind becoming west around 5 mph in the afternoon.
High: 93 °F		 Tonight

Tonight: A chance of showers and thunderstorms before 2am, then a chance of showers after 5am. Increasing clouds, with a low around 68. East wind around 5 mph becoming calm. Chance of precipitation is 40%.
Low: 68 °F		 Saturday

Saturday: Showers and thunderstorms likely, then showers and possibly a thunderstorm after 11am. High near 86. Southwest wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
High: 86 °F		 Saturday
Night
Saturday Night: Partly cloudy, with a low around 66. Calm wind.
Low: 66 °F		 Sunday

Sunday: Areas of fog before 9am. Otherwise, mostly sunny, with a high near 90. Calm wind becoming west northwest around 5 mph.
High: 90 °F		 Sunday
Night
Sunday Night: Patchy fog after midnight. Otherwise, mostly clear, with a low around 66. Calm wind.
Low: 66 °F		 Monday

Monday: Patchy fog before 9am. Otherwise, sunny, with a high near 91. Calm wind becoming east around 5 mph in the afternoon.
High: 91 °F		 Monday
Night
Monday Night: Clear, with a low around 67. East wind around 5 mph becoming calm after midnight.
Low: 67 °F		 Tuesday

Tuesday: Sunny, with a high near 93. South wind around 5 mph.
High: 93 °F
Mostly Sunny

 Chance
T-storms then
Chance
Showers
 Showers

 Partly Cloudy

 Areas Fog
then Sunny

 Mostly Clear
then Patchy
Fog
 Patchy Fog
then Sunny

 Clear

 Sunny

 

Today
 
 Mostly sunny, with a high near 93. Heat index values as high as 100. Calm wind becoming west around 5 mph in the afternoon.
Tonight
 
 A chance of showers and thunderstorms before 2am, then a chance of showers after 5am. Increasing clouds, with a low around 68. East wind around 5 mph becoming calm. Chance of precipitation is 40%.
Saturday
 
 Showers and thunderstorms likely, then showers and possibly a thunderstorm after 11am. High near 86. Southwest wind around 5 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday Night
 
 Partly cloudy, with a low around 66. Calm wind.
Sunday
 
 Areas of fog before 9am. Otherwise, mostly sunny, with a high near 90. Calm wind becoming west northwest around 5 mph.
Sunday Night
 
 Patchy fog after midnight. Otherwise, mostly clear, with a low around 66. Calm wind.
Monday
 
 Patchy fog before 9am. Otherwise, sunny, with a high near 91. Calm wind becoming east around 5 mph in the afternoon.
Monday Night
 
 Clear, with a low around 67. East wind around 5 mph becoming calm after midnight.
Tuesday
 
 Sunny, with a high near 93. South wind around 5 mph.
Tuesday Night
 
 Mostly clear, with a low around 69.
Wednesday
 
 Sunny, with a high near 93.
Wednesday Night
 
 Mostly clear, with a low around 69.
Thursday
 
 A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 92.

 

Forecast from NOAA-NWS for Watertown TN.