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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 5:21 am CDT Aug 26, 2026
 
Today

Today: Mostly sunny, with a high near 90. Calm wind becoming west around 5 mph.
High: 90 °F		 Tonight

Tonight: A slight chance of showers between 3am and 4am, then a slight chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 68. Calm wind. Chance of precipitation is 20%.
Low: 68 °F		 Thursday

Thursday: A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 90. Heat index values as high as 97. Calm wind becoming west southwest around 5 mph in the afternoon. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
High: 90 °F		 Thursday
Night
Thursday Night: A chance of showers and thunderstorms. Patchy fog between midnight and 3am. Otherwise, partly cloudy, with a low around 66. Calm wind. Chance of precipitation is 30%.
Low: 66 °F		 Friday

Friday: Sunny, with a high near 88. Calm wind becoming north around 5 mph in the afternoon.
High: 88 °F		 Friday
Night
Friday Night: Mostly clear, with a low around 64. North northeast wind around 5 mph becoming calm in the evening.
Low: 64 °F		 Saturday

Saturday: Sunny, with a high near 90. Calm wind becoming east northeast around 5 mph.
High: 90 °F		 Saturday
Night
Saturday Night: Mostly clear, with a low around 68. Calm wind.
Low: 68 °F		 Sunday

Sunday: Sunny, with a high near 91. Calm wind becoming south around 5 mph in the morning.
High: 91 °F
Mostly Sunny

 Mostly Cloudy
then Slight
Chance
T-storms
 Slight Chance
T-storms then
Chance
T-storms
 Chance
Showers and
Patchy Fog
 Sunny

 Mostly Clear

 Sunny

 Mostly Clear

 Sunny

 

Today
 
 Mostly sunny, with a high near 90. Calm wind becoming west around 5 mph.
Tonight
 
 A slight chance of showers between 3am and 4am, then a slight chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 68. Calm wind. Chance of precipitation is 20%.
Thursday
 
 A 50 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 90. Heat index values as high as 97. Calm wind becoming west southwest around 5 mph in the afternoon. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Thursday Night
 
 A chance of showers and thunderstorms. Patchy fog between midnight and 3am. Otherwise, partly cloudy, with a low around 66. Calm wind. Chance of precipitation is 30%.
Friday
 
 Sunny, with a high near 88. Calm wind becoming north around 5 mph in the afternoon.
Friday Night
 
 Mostly clear, with a low around 64. North northeast wind around 5 mph becoming calm in the evening.
Saturday
 
 Sunny, with a high near 90. Calm wind becoming east northeast around 5 mph.
Saturday Night
 
 Mostly clear, with a low around 68. Calm wind.
Sunday
 
 Sunny, with a high near 91. Calm wind becoming south around 5 mph in the morning.
Sunday Night
 
 Partly cloudy, with a low around 71.
Monday
 
 Sunny, with a high near 92.
Monday Night
 
 Mostly clear, with a low around 72.
Tuesday
 
 A 20 percent chance of showers and thunderstorms. Sunny, with a high near 93.

 

Forecast from NOAA-NWS for Watertown TN.