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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 4:46 am CDT Jul 18, 2026
 
Overnight

Overnight: A 20 percent chance of showers and thunderstorms. Patchy fog. Otherwise, partly cloudy, with a low around 71. Calm wind.
Low: 71 °F		 Saturday

Saturday: A 30 percent chance of showers and thunderstorms, mainly between 1pm and 2pm. Patchy fog before 7am. Otherwise, mostly sunny, with a high near 90. Heat index values as high as 101. Calm wind becoming west northwest around 5 mph in the afternoon.
High: 90 °F		 Saturday
Night
Saturday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 73. West wind around 5 mph becoming calm. Chance of precipitation is 30%.
Low: 73 °F		 Sunday

Sunday: Showers and thunderstorms likely, mainly between 1pm and 5pm. Mostly sunny, with a high near 90. Heat index values as high as 100. Calm wind becoming west northwest around 5 mph in the afternoon. Chance of precipitation is 60%.
High: 90 °F		 Sunday
Night
Sunday Night: Showers and thunderstorms likely before 10pm, then a chance of showers between 10pm and 1am. Patchy fog after 1am. Otherwise, partly cloudy, with a low around 71. Calm wind. Chance of precipitation is 60%.
Low: 71 °F		 Monday

Monday: A 30 percent chance of showers and thunderstorms after 1pm. Areas of fog before 8am. Otherwise, mostly sunny, with a high near 90. Calm wind becoming west around 5 mph.
High: 90 °F		 Monday
Night
Monday Night: Partly cloudy, with a low around 73. Calm wind becoming south 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 92. Southwest wind 5 to 10 mph.
High: 92 °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. Southwest wind around 5 mph becoming northwest after midnight. Chance of precipitation is 60%.
Low: 73 °F
Slight Chance
T-storms and
Patchy Fog

 Chance
T-storms and
Patchy Fog

 Chance
T-storms

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

 Partly Cloudy


 Chance
T-storms

 Showers
Likely

 

Overnight
 
 A 20 percent chance of showers and thunderstorms. Patchy fog. Otherwise, partly cloudy, with a low around 71. Calm wind.
Saturday
 
 A 30 percent chance of showers and thunderstorms, mainly between 1pm and 2pm. Patchy fog before 7am. Otherwise, mostly sunny, with a high near 90. Heat index values as high as 101. Calm wind becoming west northwest around 5 mph in the afternoon.
Saturday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 73. West wind around 5 mph becoming calm. Chance of precipitation is 30%.
Sunday
 
 Showers and thunderstorms likely, mainly between 1pm and 5pm. Mostly sunny, with a high near 90. Heat index values as high as 100. Calm wind becoming west northwest around 5 mph in the afternoon. Chance of precipitation is 60%.
Sunday Night
 
 Showers and thunderstorms likely before 10pm, then a chance of showers between 10pm and 1am. Patchy fog after 1am. Otherwise, partly cloudy, with a low around 71. Calm wind. Chance of precipitation is 60%.
Monday
 
 A 30 percent chance of showers and thunderstorms after 1pm. Areas of fog before 8am. Otherwise, mostly sunny, with a high near 90. Calm wind becoming west around 5 mph.
Monday Night
 
 Partly cloudy, with a low around 73. Calm wind becoming south around 5 mph.
Tuesday
 
 A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92. Southwest wind 5 to 10 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. Southwest wind around 5 mph becoming northwest after midnight. Chance of precipitation is 60%.
Wednesday
 
 A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 86.
Wednesday Night
 
 Mostly clear, with a low around 63.
Thursday
 
 Sunny, with a high near 82.
Thursday Night
 
 Partly cloudy, with a low around 64.
Friday
 
 Mostly sunny, with a high near 85.

 

Forecast from NOAA-NWS for Watertown TN.