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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 6:16 am CDT Aug 18, 2026
 
Today

Today: Sunny, with a high near 87. North northwest wind around 5 mph.
High: 87 °F		 Tonight

Tonight: Patchy fog after 5am. Otherwise, mostly clear, with a low around 66. Calm wind.
Low: 66 °F		 Wednesday

Wednesday: Mostly sunny, with a high near 91. Calm wind becoming north around 5 mph.
High: 91 °F		 Wednesday
Night
Wednesday Night: A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71. Calm wind becoming south around 5 mph.
Low: 71 °F		 Thursday

Thursday: Showers likely and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. Calm wind becoming west southwest around 5 mph in the morning. Chance of precipitation is 60%.
High: 89 °F		 Thursday
Night
Thursday Night: A chance of showers and thunderstorms. Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 69. West wind around 5 mph becoming calm. Chance of precipitation is 40%.
Low: 69 °F		 Friday

Friday: A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 88. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 30%.
High: 88 °F		 Friday
Night
Friday Night: Partly cloudy, with a low around 66. North wind around 5 mph becoming calm.
Low: 66 °F		 Saturday

Saturday: Sunny, with a high near 89. Calm wind becoming north northwest around 5 mph in the afternoon.
High: 89 °F
Sunny


 Mostly Clear
then Patchy
Fog

 Mostly Sunny


 Partly Cloudy
then Chance
T-storms

 Showers
Likely

 Chance
T-storms and
Patchy Fog

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


 Sunny

 

Today
 
 Sunny, with a high near 87. North northwest wind around 5 mph.
Tonight
 
 Patchy fog after 5am. Otherwise, mostly clear, with a low around 66. Calm wind.
Wednesday
 
 Mostly sunny, with a high near 91. Calm wind becoming north around 5 mph.
Wednesday Night
 
 A 50 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71. Calm wind becoming south around 5 mph.
Thursday
 
 Showers likely and possibly a thunderstorm, mainly before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 89. Calm wind becoming west southwest around 5 mph in the morning. Chance of precipitation is 60%.
Thursday Night
 
 A chance of showers and thunderstorms. Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 69. West wind around 5 mph becoming calm. Chance of precipitation is 40%.
Friday
 
 A slight chance of showers, then a chance of showers and thunderstorms after 1pm. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 88. Calm wind becoming northwest around 5 mph in the afternoon. Chance of precipitation is 30%.
Friday Night
 
 Partly cloudy, with a low around 66. North wind around 5 mph becoming calm.
Saturday
 
 Sunny, with a high near 89. Calm wind becoming north northwest around 5 mph in the afternoon.
Saturday Night
 
 Mostly clear, with a low around 67.
Sunday
 
 Sunny, with a high near 88.
Sunday Night
 
 Mostly clear, with a low around 64.
Monday
 
 Mostly sunny, with a high near 88.

 

Forecast from NOAA-NWS for Watertown TN.