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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.