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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 12:11 am CDT Aug 20, 2026
 
Overnight

Overnight: A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 70. South wind around 5 mph becoming west southwest. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Low: 70 °F		 Thursday

Thursday: Showers and thunderstorms likely, mainly before 1pm. Partly sunny, with a high near 89. Heat index values as high as 100. South wind around 5 mph becoming west in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
High: 89 °F		 Thursday
Night
Thursday Night: A chance of showers and thunderstorms before 3am, then a slight chance of showers between 3am and 4am, then a slight chance of showers and thunderstorms after 4am. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 69. Northeast wind around 5 mph becoming calm. Chance of precipitation is 40%.
Low: 69 °F		 Friday

Friday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 88. Heat index values as high as 97. Calm wind becoming north northwest around 5 mph in the afternoon.
High: 88 °F		 Friday
Night
Friday Night: Patchy fog after 2am. Otherwise, mostly clear, with a low around 66. North wind around 5 mph becoming calm.
Low: 66 °F		 Saturday

Saturday: Areas of fog before 8am. Otherwise, sunny, with a high near 90. Light and variable wind becoming northwest 5 to 10 mph in the afternoon.
High: 90 °F		 Saturday
Night
Saturday Night: Patchy fog after 4am. Otherwise, mostly clear, with a low around 65. North northwest wind around 5 mph becoming calm.
Low: 65 °F		 Sunday

Sunday: Patchy fog before 8am. Otherwise, sunny, with a high near 86. Light north wind becoming north northwest 5 to 10 mph in the afternoon.
High: 86 °F		 Sunday
Night
Sunday Night: Partly cloudy, with a low around 62. North wind around 5 mph becoming calm.
Low: 62 °F
Showers
Likely

 Showers
Likely then
Chance
T-storms
 Chance
T-storms and
Patchy Fog
 Patchy Fog
then Mostly
Sunny
 Mostly Clear
then Patchy
Fog
 Areas Fog
then Sunny

 Mostly Clear
then Patchy
Fog
 Patchy Fog
then Sunny

 Partly Cloudy

Severe Thunderstorm Watch
 

Overnight
 
 A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 70. South wind around 5 mph becoming west southwest. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
 
 Showers and thunderstorms likely, mainly before 1pm. Partly sunny, with a high near 89. Heat index values as high as 100. South wind around 5 mph becoming west in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday Night
 
 A chance of showers and thunderstorms before 3am, then a slight chance of showers between 3am and 4am, then a slight chance of showers and thunderstorms after 4am. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 69. Northeast wind around 5 mph becoming calm. Chance of precipitation is 40%.
Friday
 
 Patchy fog before 9am. Otherwise, mostly sunny, with a high near 88. Heat index values as high as 97. Calm wind becoming north northwest around 5 mph in the afternoon.
Friday Night
 
 Patchy fog after 2am. Otherwise, mostly clear, with a low around 66. North wind around 5 mph becoming calm.
Saturday
 
 Areas of fog before 8am. Otherwise, sunny, with a high near 90. Light and variable wind becoming northwest 5 to 10 mph in the afternoon.
Saturday Night
 
 Patchy fog after 4am. Otherwise, mostly clear, with a low around 65. North northwest wind around 5 mph becoming calm.
Sunday
 
 Patchy fog before 8am. Otherwise, sunny, with a high near 86. Light north wind becoming north northwest 5 to 10 mph in the afternoon.
Sunday Night
 
 Partly cloudy, with a low around 62. North wind around 5 mph becoming calm.
Monday
 
 Mostly sunny, with a high near 86.
Monday Night
 
 Partly cloudy, with a low around 63.
Tuesday
 
 Sunny, with a high near 88.
Tuesday Night
 
 Partly cloudy, with a low around 66.
Wednesday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.

 

Forecast from NOAA-NWS for Watertown TN.