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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 1:31 am CDT Jul 17, 2026
 
Today

Today: Showers and thunderstorms likely, mainly after 1pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 89. Heat index values as high as 99. Calm wind becoming west 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		 Tonight

Tonight: A chance of showers and thunderstorms before 10pm, then a slight chance of showers and thunderstorms after 4am. Patchy fog before 1am, then patchy fog after 2am. Otherwise, partly cloudy, with a low around 72. Calm wind. Chance of precipitation is 30%.
Low: 72 °F		 Saturday

Saturday: A 40 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Sunny, with a high near 90. Heat index values as high as 99. Calm wind becoming west around 5 mph in the morning.
High: 90 °F		 Saturday
Night
Saturday Night: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 72. West wind around 5 mph becoming calm. Chance of precipitation is 60%.
Low: 72 °F		 Sunday

Sunday: A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 89. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 70%.
High: 89 °F		 Sunday
Night
Sunday Night: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 71. Calm wind. Chance of precipitation is 20%.
Low: 71 °F		 Monday

Monday: A 20 percent chance of showers and thunderstorms after 1pm. Areas of fog before 8am. Otherwise, mostly sunny, with a high near 90. Calm wind becoming northwest around 5 mph.
High: 90 °F		 Monday
Night
Monday Night: Mostly clear, with a low around 73. Calm wind becoming south around 5 mph.
Low: 73 °F		 Tuesday

Tuesday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. West southwest wind 5 to 10 mph.
High: 93 °F
Slight Chance
T-storms and
Patchy Fog
then T-storms
Likely
 Chance
T-storms and
Patchy Fog

 Chance
T-storms

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

 Areas Fog
then Slight
Chance
T-storms
 Mostly Clear


 Mostly Sunny
then Slight
Chance
T-storms

 

Today
 
 Showers and thunderstorms likely, mainly after 1pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 89. Heat index values as high as 99. Calm wind becoming west 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.
Tonight
 
 A chance of showers and thunderstorms before 10pm, then a slight chance of showers and thunderstorms after 4am. Patchy fog before 1am, then patchy fog after 2am. Otherwise, partly cloudy, with a low around 72. Calm wind. Chance of precipitation is 30%.
Saturday
 
 A 40 percent chance of showers and thunderstorms, mainly between 1pm and 4pm. Sunny, with a high near 90. Heat index values as high as 99. Calm wind becoming west around 5 mph in the morning.
Saturday Night
 
 A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Partly cloudy, with a low around 72. West wind around 5 mph becoming calm. Chance of precipitation is 60%.
Sunday
 
 A slight chance of showers before 10am, then a slight chance of showers and thunderstorms between 10am and 1pm, then showers likely and possibly a thunderstorm after 1pm. Mostly sunny, with a high near 89. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 70%.
Sunday Night
 
 A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and 1am. Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 71. Calm wind. Chance of precipitation is 20%.
Monday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Areas of fog before 8am. Otherwise, mostly sunny, with a high near 90. Calm wind becoming northwest around 5 mph.
Monday Night
 
 Mostly clear, with a low around 73. Calm wind becoming south around 5 mph.
Tuesday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 93. West southwest wind 5 to 10 mph.
Tuesday Night
 
 A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 73.
Wednesday
 
 Mostly sunny, with a high near 88.
Wednesday Night
 
 Mostly clear, with a low around 66.
Thursday
 
 Sunny, with a high near 86.

 

Forecast from NOAA-NWS for Watertown TN.