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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 1:31 pm CDT Jul 18, 2026
 
Tonight

Tonight: A 30 percent chance of showers and thunderstorms, mainly between 3am and 4am. Partly cloudy, with a low around 72. West northwest wind around 5 mph becoming calm in the evening.
Low: 72 °F		 Sunday

Sunday: Showers and thunderstorms likely, mainly after 1pm. Mostly sunny, with a high near 89. Heat index values as high as 99. Calm wind becoming west northwest around 5 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
High: 89 °F		 Sunday
Night
Sunday Night: A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and midnight. Patchy fog before 1am, then patchy fog after 2am. Otherwise, partly cloudy, with a low around 71. Calm wind. Chance of precipitation is 30%.
Low: 71 °F		 Monday

Monday: A 50 percent chance of showers and thunderstorms after 1pm. Areas of fog before 9am. Otherwise, mostly sunny, with a high near 90. Heat index values as high as 99. Calm wind becoming west southwest around 5 mph.
High: 90 °F		 Monday
Night
Monday Night: Partly cloudy, with a low around 73. Calm wind becoming south southwest around 5 mph.
Low: 73 °F		 Tuesday

Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
High: 91 °F		 Tuesday
Night
Tuesday Night: Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73. South southwest wind 5 to 10 mph becoming west after midnight. Chance of precipitation is 70%.
Low: 73 °F		 Wednesday

Wednesday: A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87. North wind 5 to 10 mph.
High: 87 °F		 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 63. North wind 5 to 10 mph.
Low: 63 °F
Chance
T-storms

 Slight Chance
T-storms then
T-storms
Likely
 Chance
T-storms and
Patchy Fog
then Patchy
Fog
 Areas Fog
then Chance
T-storms

 Partly Cloudy


 Chance
T-storms

 Showers
Likely

 Slight Chance
T-storms

 Mostly Clear

 

Tonight
 
 A 30 percent chance of showers and thunderstorms, mainly between 3am and 4am. Partly cloudy, with a low around 72. West northwest wind around 5 mph becoming calm in the evening.
Sunday
 
 Showers and thunderstorms likely, mainly after 1pm. Mostly sunny, with a high near 89. Heat index values as high as 99. Calm wind becoming west northwest around 5 mph in the afternoon. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Sunday Night
 
 A chance of showers and thunderstorms before 11pm, then a slight chance of showers between 11pm and midnight. Patchy fog before 1am, then patchy fog after 2am. Otherwise, partly cloudy, with a low around 71. Calm wind. Chance of precipitation is 30%.
Monday
 
 A 50 percent chance of showers and thunderstorms after 1pm. Areas of fog before 9am. Otherwise, mostly sunny, with a high near 90. Heat index values as high as 99. Calm wind becoming west southwest around 5 mph.
Monday Night
 
 Partly cloudy, with a low around 73. Calm wind becoming south southwest around 5 mph.
Tuesday
 
 A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 91. Southwest wind 5 to 10 mph, with gusts as high as 20 mph.
Tuesday Night
 
 Showers likely and possibly a thunderstorm before 1am, then a chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 73. South southwest wind 5 to 10 mph becoming west after midnight. Chance of precipitation is 70%.
Wednesday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87. North wind 5 to 10 mph.
Wednesday Night
 
 Mostly clear, with a low around 63. North wind 5 to 10 mph.
Thursday
 
 Sunny, with a high near 82.
Thursday Night
 
 Partly cloudy, with a low around 62.
Friday
 
 Mostly sunny, with a high near 86.
Friday Night
 
 Partly cloudy, with a low around 69.
Saturday
 
 A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 88.

 

Forecast from NOAA-NWS for Watertown TN.