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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 7:06 pm CDT Aug 16, 2026
 
Tonight

Tonight: Mostly clear, with a low around 75. South southwest wind around 5 mph.
Low: 75 °F
Monday

Monday: A 30 percent chance of showers and thunderstorms, mainly before 4pm.  Mostly sunny, with a high near 94. Heat index values as high as 105. South southwest wind 5 to 10 mph becoming west northwest in the afternoon.
High: 94 °F
Monday
Night
Monday Night: A slight chance of showers and thunderstorms between 7pm and 8pm.  Partly cloudy, with a low around 70. Northwest wind around 5 mph becoming calm  in the evening.  Chance of precipitation is 20%.
Low: 70 °F
Tuesday

Tuesday: Patchy fog before 7am.  Otherwise, mostly sunny, with a high near 90. Calm wind becoming north northwest around 5 mph in the afternoon.
High: 90 °F
Tuesday
Night
Tuesday Night: Mostly clear, with a low around 68. Calm wind.
Low: 68 °F
Wednesday

Wednesday: Sunny, with a high near 94. Calm wind becoming southwest around 5 mph.
High: 94 °F
Wednesday
Night
Wednesday Night: A 40 percent chance of showers and thunderstorms after 1am.  Partly cloudy, with a low around 71. Calm wind becoming south around 5 mph after midnight.
Low: 71 °F
Thursday

Thursday: Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm.  Partly sunny, with a high near 90. South southwest wind around 5 mph becoming west northwest in the afternoon.  Chance of precipitation is 60%.
High: 90 °F
Thursday
Night
Thursday Night: A 50 percent chance of showers and thunderstorms.  Mostly cloudy, with a low around 68. North northwest wind around 5 mph becoming calm.
Low: 68 °F
Mostly Clear

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

Sunny

Partly Cloudy
then Chance
Showers
Showers
Likely
Chance
T-storms

Heat Advisory
 

Tonight
 
Mostly clear, with a low around 75. South southwest wind around 5 mph.
Monday
 
A 30 percent chance of showers and thunderstorms, mainly before 4pm. Mostly sunny, with a high near 94. Heat index values as high as 105. South southwest wind 5 to 10 mph becoming west northwest in the afternoon.
Monday Night
 
A slight chance of showers and thunderstorms between 7pm and 8pm. Partly cloudy, with a low around 70. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Tuesday
 
Patchy fog before 7am. Otherwise, mostly sunny, with a high near 90. Calm wind becoming north northwest around 5 mph in the afternoon.
Tuesday Night
 
Mostly clear, with a low around 68. Calm wind.
Wednesday
 
Sunny, with a high near 94. Calm wind becoming southwest around 5 mph.
Wednesday Night
 
A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 71. Calm wind becoming south around 5 mph after midnight.
Thursday
 
Showers likely and possibly a thunderstorm before 1pm, then a chance of showers and thunderstorms after 1pm. Partly sunny, with a high near 90. South southwest wind around 5 mph becoming west northwest in the afternoon. Chance of precipitation is 60%.
Thursday Night
 
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68. North northwest wind around 5 mph becoming calm.
Friday
 
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 87.
Friday Night
 
A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Saturday
 
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Saturday Night
 
Partly cloudy, with a low around 66.
Sunday
 
Mostly sunny, with a high near 88.

 

Forecast from NOAA-NWS for Watertown TN.