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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 4:26 am CDT Jul 20, 2026
 
Today

Today: A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92. Heat index values as high as 105. Calm wind becoming southwest around 5 mph.
High: 92 °F		 Tonight

Tonight: A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 74. Calm wind becoming south southwest around 5 mph.
Low: 74 °F		 Tuesday

Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 94. Heat index values as high as 107. Southwest wind 5 to 10 mph. Chance of precipitation is 40%.
High: 94 °F		 Tuesday
Night
Tuesday Night: A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7pm. Low around 73. South southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 90%.
Low: 73 °F		 Wednesday

Wednesday: A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. West wind 5 to 10 mph becoming north in the afternoon.
High: 86 °F		 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 64. North northeast wind 5 to 10 mph.
Low: 64 °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		 Friday

Friday: Partly sunny, with a high near 85. Calm wind becoming north around 5 mph in the afternoon.
High: 85 °F
Mostly Sunny
then Chance
T-storms
 Slight Chance
T-storms then
Mostly Clear
 Chance
T-storms

 Showers

 Chance
Showers then
Chance
T-storms
 Mostly Clear

 Mostly Sunny

 Partly Cloudy

 Partly Sunny

Heat Advisory
 

Today
 
 A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 92. Heat index values as high as 105. Calm wind becoming southwest around 5 mph.
Tonight
 
 A 20 percent chance of showers and thunderstorms before 8pm. Partly cloudy, with a low around 74. Calm wind becoming south southwest around 5 mph.
Tuesday
 
 A slight chance of showers, then a chance of showers and thunderstorms after 10am. Mostly sunny, with a high near 94. Heat index values as high as 107. Southwest wind 5 to 10 mph. Chance of precipitation is 40%.
Tuesday Night
 
 A slight chance of showers and thunderstorms, then showers and possibly a thunderstorm after 7pm. Low around 73. South southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 90%.
Wednesday
 
 A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 86. West wind 5 to 10 mph becoming north in the afternoon.
Wednesday Night
 
 Mostly clear, with a low around 64. 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
 
 Partly sunny, with a high near 85. Calm wind becoming north around 5 mph in the afternoon.
Friday Night
 
 A 20 percent chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 68.
Saturday
 
 A 30 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 69.
Sunday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.

 

Forecast from NOAA-NWS for Watertown TN.