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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 1:31 pm CDT Sep 20, 2026
 
This
Afternoon
This Afternoon: A 20 percent chance of showers. Mostly sunny, with a high near 95. Heat index values as high as 98. West southwest wind around 5 mph.
High: 95 °F		 Tonight

Tonight: A 20 percent chance of showers before 8pm. Partly cloudy, with a low around 71. South wind around 5 mph.
Low: 71 °F		 Monday

Monday: A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 94. Heat index values as high as 99. South southwest wind around 5 mph. Chance of precipitation is 20%.
High: 94 °F		 Monday
Night
Monday Night: A chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 2am. Patchy fog after 2am. Otherwise, partly cloudy, with a low around 66. North wind around 5 mph becoming calm. Chance of precipitation is 40%.
Low: 66 °F		 Tuesday

Tuesday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87. Light north wind increasing to 5 to 10 mph in the afternoon. Chance of precipitation is 50%.
High: 87 °F		 Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 62. North northeast wind around 5 mph.
Low: 62 °F		 Wednesday

Wednesday: A 20 percent chance of showers. Mostly sunny, with a high near 81. North wind 5 to 10 mph.
High: 81 °F		 Wednesday
Night
Wednesday Night: Partly cloudy, with a low around 59. North wind 5 to 10 mph becoming light north northeast in the evening.
Low: 59 °F		 Thursday

Thursday: Mostly sunny, with a high near 79. Calm wind becoming north around 5 mph in the morning.
High: 79 °F
Slight Chance
Showers

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

 Slight Chance
Showers

 Partly Cloudy

 Mostly Sunny

Heat Advisory
 

This Afternoon
 
 A 20 percent chance of showers. Mostly sunny, with a high near 95. Heat index values as high as 98. West southwest wind around 5 mph.
Tonight
 
 A 20 percent chance of showers before 8pm. Partly cloudy, with a low around 71. South wind around 5 mph.
Monday
 
 A slight chance of showers between 1pm and 4pm, then a slight chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 94. Heat index values as high as 99. South southwest wind around 5 mph. Chance of precipitation is 20%.
Monday Night
 
 A chance of showers and thunderstorms before 1am, then a slight chance of showers between 1am and 2am. Patchy fog after 2am. Otherwise, partly cloudy, with a low around 66. North wind around 5 mph becoming calm. Chance of precipitation is 40%.
Tuesday
 
 A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 87. Light north wind increasing to 5 to 10 mph in the afternoon. Chance of precipitation is 50%.
Tuesday Night
 
 Partly cloudy, with a low around 62. North northeast wind around 5 mph.
Wednesday
 
 A 20 percent chance of showers. Mostly sunny, with a high near 81. North wind 5 to 10 mph.
Wednesday Night
 
 Partly cloudy, with a low around 59. North wind 5 to 10 mph becoming light north northeast in the evening.
Thursday
 
 Mostly sunny, with a high near 79. Calm wind becoming north around 5 mph in the morning.
Thursday Night
 
 Partly cloudy, with a low around 58.
Friday
 
 Mostly sunny, with a high near 79.
Friday Night
 
 Partly cloudy, with a low around 55.
Saturday
 
 Mostly sunny, with a high near 80.
Saturday Night
 
 Partly cloudy, with a low around 55.
Sunday
 
 Mostly sunny, with a high near 83.

 

Forecast from NOAA-NWS for Watertown TN.