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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 7:26 am CDT Aug 17, 2026
 
Today

Today: A 30 percent chance of showers and thunderstorms, mainly between 2pm and 4pm. Mostly sunny, with a high near 94. Heat index values as high as 105. West southwest wind 5 to 10 mph.
High: 94 °F		 Tonight

Tonight: Partly cloudy, with a low around 69. North northwest wind 5 to 10 mph becoming light after midnight.
Low: 69 °F		 Tuesday

Tuesday: Mostly sunny, with a high near 88. Calm wind becoming north northwest around 5 mph in the morning.
High: 88 °F		 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 66. Calm wind.
Low: 66 °F		 Wednesday

Wednesday: Sunny, with a high near 93. Calm wind becoming west northwest around 5 mph.
High: 93 °F		 Wednesday
Night
Wednesday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72. Calm wind.
Low: 72 °F		 Thursday

Thursday: Showers likely and possibly a thunderstorm before 1pm, then a slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Calm wind becoming west around 5 mph in the morning. Chance of precipitation is 60%.
High: 90 °F		 Thursday
Night
Thursday Night: A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. Calm wind.
Low: 69 °F		 Friday

Friday: A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 88. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 50%.
High: 88 °F
Chance
T-storms

 Partly Cloudy

 Mostly Sunny

 Mostly Clear

 Sunny

 Partly Cloudy
then Chance
T-storms
 Showers
Likely

 Chance
Showers then
Chance
T-storms
 Chance
Showers then
Chance
T-storms

Heat Advisory
 

Today
 
 A 30 percent chance of showers and thunderstorms, mainly between 2pm and 4pm. Mostly sunny, with a high near 94. Heat index values as high as 105. West southwest wind 5 to 10 mph.
Tonight
 
 Partly cloudy, with a low around 69. North northwest wind 5 to 10 mph becoming light after midnight.
Tuesday
 
 Mostly sunny, with a high near 88. Calm wind becoming north northwest around 5 mph in the morning.
Tuesday Night
 
 Mostly clear, with a low around 66. Calm wind.
Wednesday
 
 Sunny, with a high near 93. Calm wind becoming west northwest around 5 mph.
Wednesday Night
 
 A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72. Calm wind.
Thursday
 
 Showers likely and possibly a thunderstorm before 1pm, then a slight chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 90. Calm wind becoming west around 5 mph in the morning. Chance of precipitation is 60%.
Thursday Night
 
 A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69. Calm wind.
Friday
 
 A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 88. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 50%.
Friday Night
 
 A 30 percent chance of showers and thunderstorms before 1am. Partly cloudy, with a low around 67.
Saturday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Saturday Night
 
 Mostly clear, with a low around 65.
Sunday
 
 Sunny, with a high near 87.

 

Forecast from NOAA-NWS for Watertown TN.