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National Weather Service Forecast for: Watertown TN
Issued by: National Weather Service Nashville, TN
Updated: 11:46 pm CDT Jul 26, 2026
 
Overnight

Overnight: Showers and thunderstorms before 2am, then showers likely and possibly a thunderstorm between 2am and 5am, then a chance of showers and thunderstorms after 5am. Patchy fog before 4am, then patchy fog after 5am. Low around 73. Calm wind. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Low: 73 °F		 Monday

Monday: A 30 percent chance of showers and thunderstorms before 7am. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 92. Heat index values as high as 105. Calm wind becoming northwest around 5 mph.
High: 92 °F		 Monday
Night
Monday Night: Mostly clear, with a low around 75. Calm wind becoming south southwest around 5 mph after midnight.
Low: 75 °F		 Tuesday

Tuesday: A chance of showers and thunderstorms between 1pm and 5pm. Mostly sunny, with a high near 94. Heat index values as high as 108. Southwest wind 5 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 40%.
High: 94 °F		 Tuesday
Night
Tuesday Night: A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 70. North wind around 5 mph. Chance of precipitation is 30%.
Low: 70 °F		 Wednesday

Wednesday: Sunny, with a high near 87. North wind 5 to 10 mph.
High: 87 °F		 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 65. North northwest wind around 5 mph becoming calm in the evening.
Low: 65 °F		 Thursday

Thursday: Sunny, with a high near 86. Calm wind becoming north around 5 mph in the morning.
High: 86 °F		 Thursday
Night
Thursday Night: Mostly clear, with a low around 65. North wind around 5 mph becoming calm.
Low: 65 °F
Showers and
Patchy Fog

 Chance
Showers and
Patchy Fog
then Sunny
 Mostly Clear

 Mostly Sunny
then Chance
T-storms
 Chance
Showers

 Sunny

 Mostly Clear

 Sunny

 Mostly Clear

Heat Advisory
 

Overnight
 
 Showers and thunderstorms before 2am, then showers likely and possibly a thunderstorm between 2am and 5am, then a chance of showers and thunderstorms after 5am. Patchy fog before 4am, then patchy fog after 5am. Low around 73. Calm wind. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Monday
 
 A 30 percent chance of showers and thunderstorms before 7am. Patchy fog before 8am. Otherwise, mostly sunny, with a high near 92. Heat index values as high as 105. Calm wind becoming northwest around 5 mph.
Monday Night
 
 Mostly clear, with a low around 75. Calm wind becoming south southwest around 5 mph after midnight.
Tuesday
 
 A chance of showers and thunderstorms between 1pm and 5pm. Mostly sunny, with a high near 94. Heat index values as high as 108. Southwest wind 5 to 10 mph becoming northwest in the afternoon. Winds could gust as high as 20 mph. Chance of precipitation is 40%.
Tuesday Night
 
 A chance of showers and thunderstorms before 10pm, then a chance of showers between 10pm and 1am. Partly cloudy, with a low around 70. North wind around 5 mph. Chance of precipitation is 30%.
Wednesday
 
 Sunny, with a high near 87. North wind 5 to 10 mph.
Wednesday Night
 
 Mostly clear, with a low around 65. North northwest wind around 5 mph becoming calm in the evening.
Thursday
 
 Sunny, with a high near 86. Calm wind becoming north around 5 mph in the morning.
Thursday Night
 
 Mostly clear, with a low around 65. North wind around 5 mph becoming calm.
Friday
 
 Mostly sunny, with a high near 88.
Friday Night
 
 A 30 percent chance of showers. Mostly cloudy, with a low around 68.
Saturday
 
 A 50 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.
Saturday Night
 
 A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Sunday
 
 A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 86.

 

Forecast from NOAA-NWS for Watertown TN.