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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 1:31 am CDT Sep 19, 2026
 
Overnight

Overnight: Mostly clear, with a low around 70. Calm wind.
Low: 70 °F		 Saturday

Saturday: A 20 percent chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 97. Heat index values as high as 103. Calm wind becoming west northwest around 5 mph.
High: 97 °F		 Saturday
Night
Saturday Night: Mostly clear, with a low around 71. Calm wind becoming south around 5 mph.
Low: 71 °F		 Sunday

Sunday: Sunny, with a high near 96. Heat index values as high as 101. South southwest wind around 5 mph.
High: 96 °F		 Sunday
Night
Sunday Night: Partly cloudy, with a low around 70. Calm wind becoming south around 5 mph.
Low: 70 °F		 Monday

Monday: A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. South wind around 5 mph becoming west northwest in the afternoon.
High: 94 °F		 Monday
Night
Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Low: 66 °F		 Tuesday

Tuesday: A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 86. Calm wind becoming north northwest around 5 mph in the afternoon. Chance of precipitation is 60%.
High: 86 °F		 Tuesday
Night
Tuesday Night: A 50 percent chance of showers. Partly cloudy, with a low around 62. North wind around 5 mph becoming calm in the evening.
Low: 62 °F
Mostly Clear

 Sunny then
Slight Chance
T-storms
 Mostly Clear

 Sunny

 Partly Cloudy

 Mostly Sunny
then Chance
T-storms
 Showers
Likely

 Chance
Showers then
Showers
Likely
 Chance
Showers

Heat Advisory
 

Overnight
 
 Mostly clear, with a low around 70. Calm wind.
Saturday
 
 A 20 percent chance of showers and thunderstorms after 2pm. Sunny and hot, with a high near 97. Heat index values as high as 103. Calm wind becoming west northwest around 5 mph.
Saturday Night
 
 Mostly clear, with a low around 71. Calm wind becoming south around 5 mph.
Sunday
 
 Sunny, with a high near 96. Heat index values as high as 101. South southwest wind around 5 mph.
Sunday Night
 
 Partly cloudy, with a low around 70. Calm wind becoming south around 5 mph.
Monday
 
 A 30 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 94. South wind around 5 mph becoming west northwest in the afternoon.
Monday Night
 
 Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 66. North wind around 5 mph becoming calm in the evening. Chance of precipitation is 60%.
Tuesday
 
 A chance of showers, then showers likely and possibly a thunderstorm after 1pm. Partly sunny, with a high near 86. Calm wind becoming north northwest around 5 mph in the afternoon. Chance of precipitation is 60%.
Tuesday Night
 
 A 50 percent chance of showers. Partly cloudy, with a low around 62. North wind around 5 mph becoming calm in the evening.
Wednesday
 
 A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 80. Chance of precipitation is 50%.
Wednesday Night
 
 A 20 percent chance of showers. Partly cloudy, with a low around 59.
Thursday
 
 A 20 percent chance of showers. Mostly sunny, with a high near 79.
Thursday Night
 
 Partly cloudy, with a low around 57.
Friday
 
 Mostly sunny, with a high near 79.

 

Forecast from NOAA-NWS for Watertown TN.