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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 11:01 pm CDT Jun 28, 2026
 
Overnight

Overnight: Patchy fog after 5am.  Otherwise, mostly clear, with a low around 73. Calm wind.
Low: 73 °F
Monday

Monday: Sunny, with a high near 94. Heat index values as high as 106. Calm wind becoming west around 5 mph.
High: 94 °F
Monday
Night
Monday Night: Mostly clear, with a low around 75. Calm wind.
Low: 75 °F
Tuesday

Tuesday: Sunny and hot, with a high near 97. Heat index values as high as 107. Calm wind.
High: 97 °F
Tuesday
Night
Tuesday Night: Mostly clear, with a low around 76. Calm wind.
Low: 76 °F
Wednesday

Wednesday: Sunny and hot, with a high near 97. Calm wind becoming southeast around 5 mph.
High: 97 °F
Wednesday
Night
Wednesday Night: Mostly clear, with a low around 75. Calm wind.
Low: 75 °F
Thursday

Thursday: A 20 percent chance of showers and thunderstorms after 1pm.  Sunny and hot, with a high near 98. Calm wind becoming east northeast around 5 mph.
High: 98 °F
Thursday
Night
Thursday Night: A 30 percent chance of showers and thunderstorms before 1am.  Mostly clear, with a low around 75. Calm wind.
Low: 75 °F
Patchy Fog

Sunny

Mostly Clear

Hot

Mostly Clear

Hot

Mostly Clear

Sunny then
Slight Chance
T-storms
Chance
T-storms

Extreme Heat Warning
 

Overnight
 
Patchy fog after 5am. Otherwise, mostly clear, with a low around 73. Calm wind.
Monday
 
Sunny, with a high near 94. Heat index values as high as 106. Calm wind becoming west around 5 mph.
Monday Night
 
Mostly clear, with a low around 75. Calm wind.
Tuesday
 
Sunny and hot, with a high near 97. Heat index values as high as 107. Calm wind.
Tuesday Night
 
Mostly clear, with a low around 76. Calm wind.
Wednesday
 
Sunny and hot, with a high near 97. Calm wind becoming southeast around 5 mph.
Wednesday Night
 
Mostly clear, with a low around 75. Calm wind.
Thursday
 
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 98. Calm wind becoming east northeast around 5 mph.
Thursday Night
 
A 30 percent chance of showers and thunderstorms before 1am. Mostly clear, with a low around 75. Calm wind.
Friday
 
A 20 percent chance of showers and thunderstorms after 1pm. Sunny and hot, with a high near 97.
Friday Night
 
Mostly clear, with a low around 75.
Independence Day
 
A 30 percent chance of showers and thunderstorms. Sunny, with a high near 96.
Saturday Night
 
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 74.
Sunday
 
A 40 percent chance of showers and thunderstorms. Sunny, with a high near 94.

 

Forecast from NOAA-NWS for Watertown TN.