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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 6:41 pm CDT Aug 15, 2026
 
Tonight

Tonight: Mostly clear, with a low around 74. Calm wind becoming south southwest around 5 mph.
Low: 74 °F		 Sunday

Sunday: Sunny and hot, with a high near 97. Heat index values as high as 106. West southwest wind around 5 mph.
High: 97 °F		 Sunday
Night
Sunday Night: Mostly clear, with a low around 75. Calm wind becoming southwest around 5 mph.
Low: 75 °F		 Monday

Monday: A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94. Heat index values as high as 105. Southwest wind 5 to 10 mph becoming northwest in the afternoon.
High: 94 °F		 Monday
Night
Monday Night: Patchy fog after 5am. Otherwise, partly cloudy, with a low around 71. North northwest wind around 5 mph becoming calm in the evening.
Low: 71 °F		 Tuesday

Tuesday: Patchy fog before 8am. Otherwise, mostly sunny, with a high near 90. Calm wind becoming north 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 west southwest around 5 mph in the afternoon.
High: 94 °F		 Wednesday
Night
Wednesday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 72. South wind around 5 mph.
Low: 72 °F
Mostly Clear

 Hot

 Mostly Clear

 Sunny then
Chance
T-storms
 Partly Cloudy
then Patchy
Fog
 Patchy Fog
then Sunny

 Mostly Clear

 Sunny

 Slight Chance
T-storms then
Chance
Showers

Extreme Heat Warning
 

Tonight
 
 Mostly clear, with a low around 74. Calm wind becoming south southwest around 5 mph.
Sunday
 
 Sunny and hot, with a high near 97. Heat index values as high as 106. West southwest wind around 5 mph.
Sunday Night
 
 Mostly clear, with a low around 75. Calm wind becoming southwest around 5 mph.
Monday
 
 A 30 percent chance of showers and thunderstorms after 1pm. Sunny, with a high near 94. Heat index values as high as 105. Southwest wind 5 to 10 mph becoming northwest in the afternoon.
Monday Night
 
 Patchy fog after 5am. Otherwise, partly cloudy, with a low around 71. North northwest wind around 5 mph becoming calm in the evening.
Tuesday
 
 Patchy fog before 8am. Otherwise, mostly sunny, with a high near 90. Calm wind becoming north 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 west southwest around 5 mph in the afternoon.
Wednesday Night
 
 A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly clear, with a low around 72. South wind around 5 mph.
Thursday
 
 A 40 percent chance of showers and thunderstorms, mainly after 1pm. Mostly sunny, with a high near 90.
Thursday Night
 
 A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 68.
Friday
 
 A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 88.
Friday Night
 
 A 20 percent chance of showers and thunderstorms. Partly cloudy, with a low around 66.
Saturday
 
 Mostly sunny, with a high near 87.

 

Forecast from NOAA-NWS for Watertown TN.