| National Weather Service Forecast for:
Watertown TN Issued by: National Weather Service Nashville, TN |
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| Updated: 12:11 am CDT Aug 20, 2026 | ||||||||||||||||||
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| Overnight |
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 5am. Mostly cloudy, with a low around 70. South wind around 5 mph becoming west southwest. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. |
| Thursday |
Showers and thunderstorms likely, mainly before 1pm. Partly sunny, with a high near 89. Heat index values as high as 100. South wind around 5 mph becoming west in the afternoon. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms. |
| Thursday Night |
A chance of showers and thunderstorms before 3am, then a slight chance of showers between 3am and 4am, then a slight chance of showers and thunderstorms after 4am. Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 69. Northeast wind around 5 mph becoming calm. Chance of precipitation is 40%. |
| Friday |
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 88. Heat index values as high as 97. Calm wind becoming north northwest around 5 mph in the afternoon. |
| Friday Night |
Patchy fog after 2am. Otherwise, mostly clear, with a low around 66. North wind around 5 mph becoming calm. |
| Saturday |
Areas of fog before 8am. Otherwise, sunny, with a high near 90. Light and variable wind becoming northwest 5 to 10 mph in the afternoon. |
| Saturday Night |
Patchy fog after 4am. Otherwise, mostly clear, with a low around 65. North northwest wind around 5 mph becoming calm. |
| Sunday |
Patchy fog before 8am. Otherwise, sunny, with a high near 86. Light north wind becoming north northwest 5 to 10 mph in the afternoon. |
| Sunday Night |
Partly cloudy, with a low around 62. North wind around 5 mph becoming calm. |
| Monday |
Mostly sunny, with a high near 86. |
| Monday Night |
Partly cloudy, with a low around 63. |
| Tuesday |
Sunny, with a high near 88. |
| Tuesday Night |
Partly cloudy, with a low around 66. |
| Wednesday |
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90. |
Forecast from NOAA-NWS for Watertown TN.



