Skip to main content.
National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 9:47 pm CDT Jul 19, 2026
 
Overnight

Overnight: Patchy fog before 4am, then patchy fog after 5am. Otherwise, partly cloudy, with a low around 71. Calm wind.
Low: 71 °F		 Monday

Monday: A 30 percent chance of showers and thunderstorms, mainly between 1pm and 3pm. Areas of fog before 8am. Otherwise, mostly sunny, with a high near 91. Heat index values as high as 103. Calm wind becoming southwest around 5 mph.
High: 91 °F		 Monday
Night
Monday Night: A 10 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 74. Calm wind becoming south southwest around 5 mph.
Low: 74 °F		 Tuesday

Tuesday: A 30 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92. Heat index values as high as 103. Southwest wind 5 to 10 mph.
High: 92 °F		 Tuesday
Night
Tuesday Night: Showers and possibly a thunderstorm. Low around 74. South southwest wind around 5 mph. Chance of precipitation is 80%.
Low: 74 °F		 Wednesday

Wednesday: A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. South southwest wind 5 to 10 mph becoming north in the afternoon.
High: 87 °F		 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 65. North northeast wind 5 to 10 mph.
Low: 65 °F		 Thursday

Thursday: Mostly sunny, with a high near 84. North northeast wind 5 to 10 mph.
High: 84 °F		 Thursday
Night
Thursday Night: Partly cloudy, with a low around 64. North northeast wind around 5 mph becoming calm in the evening.
Low: 64 °F
Patchy Fog

 Areas Fog
then Chance
T-storms
 Slight Chance
T-storms then
Partly Cloudy
 Chance
T-storms
 Showers

 Chance
T-storms
 Mostly Clear

 Mostly Sunny

 Partly Cloudy

Heat Advisory
 

Overnight
 
 Patchy fog before 4am, then patchy fog after 5am. Otherwise, partly cloudy, with a low around 71. Calm wind.
Monday
 
 A 30 percent chance of showers and thunderstorms, mainly between 1pm and 3pm. Areas of fog before 8am. Otherwise, mostly sunny, with a high near 91. Heat index values as high as 103. Calm wind becoming southwest around 5 mph.
Monday Night
 
 A 10 percent chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 74. 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 92. Heat index values as high as 103. Southwest wind 5 to 10 mph.
Tuesday Night
 
 Showers and possibly a thunderstorm. Low around 74. South southwest wind around 5 mph. Chance of precipitation is 80%.
Wednesday
 
 A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 87. South southwest wind 5 to 10 mph becoming north in the afternoon.
Wednesday Night
 
 Mostly clear, with a low around 65. North northeast wind 5 to 10 mph.
Thursday
 
 Mostly sunny, with a high near 84. North northeast wind 5 to 10 mph.
Thursday Night
 
 Partly cloudy, with a low around 64. North northeast wind around 5 mph becoming calm in the evening.
Friday
 
 Mostly sunny, with a high near 85.
Friday Night
 
 A 30 percent chance of showers. Mostly cloudy, with a low around 68.
Saturday
 
 A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Saturday Night
 
 A 20 percent chance of showers. Partly cloudy, with a low around 68.
Sunday
 
 A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.

 

Forecast from NOAA-NWS for Watertown TN.