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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 1:31 am CDT Sep 20, 2026
 
Overnight

Overnight: Mostly clear, with a low around 71. South southwest wind around 5 mph.
Low: 71 °F		 Sunday

Sunday: Sunny, with a high near 95. Heat index values as high as 101. South wind around 5 mph becoming west in the afternoon.
High: 95 °F		 Sunday
Night
Sunday Night: Partly cloudy, with a low around 71. Calm wind becoming south southwest around 5 mph after midnight.
Low: 71 °F		 Monday

Monday: A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94. Heat index values as high as 99. South southwest wind around 5 mph becoming west northwest in the afternoon.
High: 94 °F		 Monday
Night
Monday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 67. Northwest wind around 5 mph becoming calm. Chance of precipitation is 30%.
Low: 67 °F		 Tuesday

Tuesday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 88. Light north wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 50%.
High: 88 °F		 Tuesday
Night
Tuesday Night: A chance of showers and thunderstorms. Partly cloudy, with a low around 63. North wind around 5 mph. Chance of precipitation is 40%.
Low: 63 °F		 Wednesday

Wednesday: A 30 percent chance of showers, mainly before 1pm. Mostly sunny, with a high near 80. North wind 5 to 10 mph.
High: 80 °F		 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 59. North wind around 5 mph becoming calm in the evening.
Low: 59 °F
Mostly Clear

 Sunny

 Partly Cloudy

 Mostly Sunny
then Slight
Chance
T-storms
 Chance
T-storms then
Chance
Showers
 Chance
Showers then
Chance
T-storms
 Chance
Showers

 Chance
Showers

 Partly Cloudy

Heat Advisory
 

Overnight
 
 Mostly clear, with a low around 71. South southwest wind around 5 mph.
Sunday
 
 Sunny, with a high near 95. Heat index values as high as 101. South wind around 5 mph becoming west in the afternoon.
Sunday Night
 
 Partly cloudy, with a low around 71. Calm wind becoming south southwest around 5 mph after midnight.
Monday
 
 A 20 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 94. Heat index values as high as 99. South southwest wind around 5 mph becoming west northwest in the afternoon.
Monday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 67. Northwest wind around 5 mph becoming calm. Chance of precipitation is 30%.
Tuesday
 
 A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 88. Light north wind increasing to 5 to 10 mph in the morning. Chance of precipitation is 50%.
Tuesday Night
 
 A chance of showers and thunderstorms. Partly cloudy, with a low around 63. North wind around 5 mph. Chance of precipitation is 40%.
Wednesday
 
 A 30 percent chance of showers, mainly before 1pm. Mostly sunny, with a high near 80. North wind 5 to 10 mph.
Wednesday Night
 
 Partly cloudy, with a low around 59. North wind around 5 mph becoming calm in the evening.
Thursday
 
 Mostly sunny, with a high near 79.
Thursday Night
 
 Partly cloudy, with a low around 57.
Friday
 
 Mostly sunny, with a high near 79.
Friday Night
 
 Mostly clear, with a low around 54.
Saturday
 
 Mostly sunny, with a high near 79.

 

Forecast from NOAA-NWS for Watertown TN.