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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 5:11 am CDT Sep 21, 2026
 
Today

Today: A 30 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 94. Heat index values as high as 99. West wind around 5 mph.
High: 94 °F		 Tonight

Tonight: A 50 percent chance of showers and thunderstorms, mainly before 11pm. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 66. East wind around 5 mph becoming calm. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Low: 66 °F		 Tuesday

Tuesday: A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 86. Light and variable wind becoming north 5 to 10 mph in the afternoon. Chance of precipitation is 40%.
High: 86 °F		 Tuesday
Night
Tuesday Night: A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am. Mostly cloudy, with a low around 63. North northeast wind around 5 mph. Chance of precipitation is 20%.
Low: 63 °F		 Wednesday

Wednesday: Partly 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 after midnight.
Low: 59 °F		 Thursday

Thursday: Mostly sunny, with a high near 80. Light north wind becoming north northeast 5 to 10 mph in the afternoon.
High: 80 °F		 Thursday
Night
Thursday Night: Mostly clear, with a low around 57. North northeast wind around 5 mph becoming calm after midnight.
Low: 57 °F		 Friday

Friday: Mostly sunny, with a high near 79. Light northeast wind becoming north 5 to 10 mph in the morning.
High: 79 °F
Mostly Sunny
then Chance
T-storms

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


 Partly Cloudy


 Mostly Sunny


 Mostly Clear


 Mostly Sunny

 

Today
 
 A 30 percent chance of showers and thunderstorms after 4pm. Mostly sunny, with a high near 94. Heat index values as high as 99. West wind around 5 mph.
Tonight
 
 A 50 percent chance of showers and thunderstorms, mainly before 11pm. Patchy fog after 1am. Otherwise, mostly cloudy, with a low around 66. East wind around 5 mph becoming calm. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday
 
 A chance of showers, with thunderstorms also possible after 1pm. Mostly sunny, with a high near 86. Light and variable wind becoming north 5 to 10 mph in the afternoon. Chance of precipitation is 40%.
Tuesday Night
 
 A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am. Mostly cloudy, with a low around 63. North northeast wind around 5 mph. Chance of precipitation is 20%.
Wednesday
 
 Partly 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 after midnight.
Thursday
 
 Mostly sunny, with a high near 80. Light north wind becoming north northeast 5 to 10 mph in the afternoon.
Thursday Night
 
 Mostly clear, with a low around 57. North northeast wind around 5 mph becoming calm after midnight.
Friday
 
 Mostly sunny, with a high near 79. Light northeast wind becoming north 5 to 10 mph in the morning.
Friday Night
 
 Mostly clear, with a low around 53.
Saturday
 
 Sunny, with a high near 81.
Saturday Night
 
 Partly cloudy, with a low around 53.
Sunday
 
 Mostly sunny, with a high near 82.

 

Forecast from NOAA-NWS for Watertown TN.