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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 10:46 pm CDT Aug 18, 2026
 
Tonight

Tonight: Mostly clear, with a low around 66. Calm wind.
Low: 66 °F		 Wednesday

Wednesday: Increasing clouds, with a high near 91. Calm wind becoming north northwest around 5 mph.
High: 91 °F		 Wednesday
Night
Wednesday Night: A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4am. Low around 71. Calm wind becoming southwest around 5 mph after midnight. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Low: 71 °F		 Thursday

Thursday: Showers and thunderstorms likely before 2pm, then a slight chance of showers and thunderstorms after 5pm. Some of the storms could produce heavy rainfall. Mostly sunny, with a high near 87. South wind around 5 mph becoming west in the afternoon. Chance of precipitation is 60%.
High: 87 °F		 Thursday
Night
Thursday Night: Showers and thunderstorms likely before 1am, then a chance of showers. Patchy fog before midnight, then patchy fog after 1am. Otherwise, partly cloudy, with a low around 69. Calm wind. Chance of precipitation is 70%.
Low: 69 °F		 Friday

Friday: A slight chance of showers, with thunderstorms also possible after 1pm. Patchy fog before 9am. Otherwise, mostly sunny, with a high near 88. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 20%.
High: 88 °F		 Friday
Night
Friday Night: Patchy fog after 2am. Otherwise, mostly clear, with a low around 66. North wind around 5 mph becoming calm.
Low: 66 °F		 Saturday

Saturday: Areas of fog before 8am. Otherwise, sunny, with a high near 88. Calm wind becoming northwest around 5 mph in the afternoon.
High: 88 °F		 Saturday
Night
Saturday Night: Mostly clear, with a low around 66. Northwest wind around 5 mph becoming calm.
Low: 66 °F
Mostly Clear

 Increasing
Clouds

 Slight Chance
T-storms then
Showers
 Heavy Rain
then Slight
Chance
T-storms
 Showers
Likely and
Patchy Fog
 Slight Chance
T-storms and
Patchy Fog
 Mostly Clear
then Patchy
Fog
 Areas Fog
then Sunny

 Mostly Clear

 

Tonight
 
 Mostly clear, with a low around 66. Calm wind.
Wednesday
 
 Increasing clouds, with a high near 91. Calm wind becoming north northwest around 5 mph.
Wednesday Night
 
 A chance of showers and thunderstorms, then showers and possibly a thunderstorm after 4am. Low around 71. Calm wind becoming southwest around 5 mph after midnight. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
 
 Showers and thunderstorms likely before 2pm, then a slight chance of showers and thunderstorms after 5pm. Some of the storms could produce heavy rainfall. Mostly sunny, with a high near 87. South wind around 5 mph becoming west in the afternoon. Chance of precipitation is 60%.
Thursday Night
 
 Showers and thunderstorms likely before 1am, then a chance of showers. Patchy fog before midnight, then patchy fog after 1am. Otherwise, partly cloudy, with a low around 69. Calm wind. Chance of precipitation is 70%.
Friday
 
 A slight chance of showers, with thunderstorms also possible after 1pm. Patchy fog before 9am. Otherwise, mostly sunny, with a high near 88. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 20%.
Friday Night
 
 Patchy fog after 2am. Otherwise, mostly clear, with a low around 66. North wind around 5 mph becoming calm.
Saturday
 
 Areas of fog before 8am. Otherwise, sunny, with a high near 88. Calm wind becoming northwest around 5 mph in the afternoon.
Saturday Night
 
 Mostly clear, with a low around 66. Northwest wind around 5 mph becoming calm.
Sunday
 
 Sunny, with a high near 87.
Sunday Night
 
 Mostly clear, with a low around 63.
Monday
 
 Mostly sunny, with a high near 87.
Monday Night
 
 Partly cloudy, with a low around 66.
Tuesday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.

 

Forecast from NOAA-NWS for Watertown TN.