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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 6:26 am CDT Aug 16, 2026
 
Today

Today: Sunny and hot, with a high near 97. Heat index values as high as 105. West southwest wind around 5 mph.
High: 97 °F		 Tonight

Tonight: Mostly clear, with a low around 75. Southwest wind around 5 mph becoming calm.
Low: 75 °F		 Monday

Monday: A slight chance of showers and thunderstorms before 2pm, then a slight chance of thunderstorms after 5pm. Sunny, with a high near 94. Heat index values as high as 107. Light and variable wind becoming northwest 5 to 10 mph in the afternoon. Chance of precipitation is 20%.
High: 94 °F		 Monday
Night
Monday Night: A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am. Patchy fog after 5am. Otherwise, partly cloudy, with a low around 71. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Low: 71 °F		 Tuesday

Tuesday: Patchy fog before 8am. Otherwise, sunny, with a high near 91. Calm wind becoming north northwest around 5 mph in the afternoon.
High: 91 °F		 Tuesday
Night
Tuesday Night: Mostly clear, with a low around 69. Calm wind.
Low: 69 °F		 Wednesday

Wednesday: Sunny, with a high near 93. Calm wind becoming west around 5 mph in the afternoon.
High: 93 °F		 Wednesday
Night
Wednesday Night: A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72. South southwest wind around 5 mph becoming calm.
Low: 72 °F		 Thursday

Thursday: A 50 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 89. South wind around 5 mph becoming west northwest in the afternoon.
High: 89 °F
Hot

 Mostly Clear

 Sunny then
Slight Chance
T-storms
 Slight Chance
T-storms and
Patchy Fog
 Patchy Fog
then Sunny
 Mostly Clear

 Sunny

 Partly Cloudy
then Chance
T-storms
 Chance
Showers

Extreme Heat Warning
 

Today
 
 Sunny and hot, with a high near 97. Heat index values as high as 105. West southwest wind around 5 mph.
Tonight
 
 Mostly clear, with a low around 75. Southwest wind around 5 mph becoming calm.
Monday
 
 A slight chance of showers and thunderstorms before 2pm, then a slight chance of thunderstorms after 5pm. Sunny, with a high near 94. Heat index values as high as 107. Light and variable wind becoming northwest 5 to 10 mph in the afternoon. Chance of precipitation is 20%.
Monday Night
 
 A slight chance of showers and thunderstorms before 7pm, then a slight chance of showers between 7pm and 1am. Patchy fog after 5am. Otherwise, partly cloudy, with a low around 71. Northwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Tuesday
 
 Patchy fog before 8am. Otherwise, sunny, with a high near 91. Calm wind becoming north northwest around 5 mph in the afternoon.
Tuesday Night
 
 Mostly clear, with a low around 69. Calm wind.
Wednesday
 
 Sunny, with a high near 93. Calm wind becoming west around 5 mph in the afternoon.
Wednesday Night
 
 A 40 percent chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 72. South southwest wind around 5 mph becoming calm.
Thursday
 
 A 50 percent chance of showers and thunderstorms, mainly before 1pm. Partly sunny, with a high near 89. South wind around 5 mph becoming west northwest in the afternoon.
Thursday Night
 
 A 40 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Friday
 
 A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 87.
Friday Night
 
 A 30 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 87.

 

Forecast from NOAA-NWS for Watertown TN.