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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 5:52 pm CDT Sep 5, 2026
 
Tonight

Tonight: A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and midnight. Patchy fog between 4am and 5am. Otherwise, partly cloudy, with a low around 71. North northwest wind around 5 mph becoming calm. Chance of precipitation is 20%.
Low: 71 °F		 Sunday

Sunday: Patchy fog before 8am. Otherwise, sunny, with a high near 92. Heat index values as high as 99. Light and variable wind becoming north 5 to 10 mph in the morning.
High: 92 °F		 Sunday
Night
Sunday Night: Mostly clear, with a low around 65. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Low: 65 °F		 Labor
Day
Labor Day: A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 90. East northeast wind around 5 mph.
High: 90 °F		 Monday
Night
Monday Night: Mostly clear, with a low around 68. Southeast wind around 5 mph.
Low: 68 °F		 Tuesday

Tuesday: Sunny, with a high near 91. South southeast wind 5 to 10 mph.
High: 91 °F		 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 68. South southeast wind around 5 mph.
Low: 68 °F		 Wednesday

Wednesday: Sunny, with a high near 93. South southwest wind 5 to 10 mph.
High: 93 °F		 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 70. South wind around 5 mph.
Low: 70 °F
Slight Chance
T-storms then
Patchy Fog
 Patchy Fog
then Sunny
 Mostly Clear

 Sunny then
Slight Chance
T-storms
 Mostly Clear

 Sunny

 Mostly Clear

 Sunny

 Mostly Clear

Heat Advisory
 

Tonight
 
 A slight chance of showers and thunderstorms before 10pm, then a slight chance of showers between 10pm and midnight. Patchy fog between 4am and 5am. Otherwise, partly cloudy, with a low around 71. North northwest wind around 5 mph becoming calm. Chance of precipitation is 20%.
Sunday
 
 Patchy fog before 8am. Otherwise, sunny, with a high near 92. Heat index values as high as 99. Light and variable wind becoming north 5 to 10 mph in the morning.
Sunday Night
 
 Mostly clear, with a low around 65. North northeast wind 5 to 10 mph, with gusts as high as 20 mph.
Labor Day
 
 A 20 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 90. East northeast wind around 5 mph.
Monday Night
 
 Mostly clear, with a low around 68. Southeast wind around 5 mph.
Tuesday
 
 Sunny, with a high near 91. South southeast wind 5 to 10 mph.
Tuesday Night
 
 Mostly clear, with a low around 68. South southeast wind around 5 mph.
Wednesday
 
 Sunny, with a high near 93. South southwest wind 5 to 10 mph.
Wednesday Night
 
 Mostly clear, with a low around 70. South wind around 5 mph.
Thursday
 
 A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 93.
Thursday Night
 
 A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Friday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 89.
Friday Night
 
 A 20 percent chance of showers. Partly cloudy, with a low around 63.
Saturday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.

 

Forecast from NOAA-NWS for Watertown TN.