National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce
Current conditions at

Columbia / Maury County (KMRC)

Lat: 35.55°NLon: 87.18°WElev: 676ft.

Fair

70°F

21°C

Humidity 100%
Wind Speed Calm
Barometer 29.99 in
Dewpoint 70°F (21°C)
Visibility 10.00 mi
Last update 21 Aug 5:35 am CDT
Extended Forecast for

Williamsport TN

  • Today

    Today: Areas of fog before 10am. Otherwise, mostly sunny, with a high near 91. Heat index values as high as 99. Calm wind becoming north northwest around 5 mph.

    High: 91 °F

    Areas Fog
    then Mostly
    Sunny

  • Tonight

    Tonight: Patchy fog after 10pm. Otherwise, mostly clear, with a low around 68. Calm wind.

    Low: 68 °F

    Patchy Fog

  • Saturday

    Saturday: Areas of fog before 9am. Otherwise, sunny, with a high near 92. Heat index values as high as 99. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 92 °F

    Areas Fog
    then Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 68. Calm wind.

    Low: 68 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 90. Calm wind becoming north northwest around 5 mph in the afternoon.

    High: 90 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 64. Calm wind.

    Low: 64 °F

    Partly Cloudy

  • Monday

    Monday: A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Calm wind becoming northwest around 5 mph.

    High: 89 °F

    Mostly Sunny
    then Slight
    Chance
    T-storms

  • Monday Night

    Monday Night: A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 65. Calm wind.

    Low: 65 °F

    Chance
    T-storms

  • Tuesday

    Tuesday: A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 89. Calm wind.

    High: 89 °F

    Chance
    T-storms

Detailed Forecast

Today
Areas of fog before 10am. Otherwise, mostly sunny, with a high near 91. Heat index values as high as 99. Calm wind becoming north northwest around 5 mph.
Tonight
Patchy fog after 10pm. Otherwise, mostly clear, with a low around 68. Calm wind.
Saturday
Areas of fog before 9am. Otherwise, sunny, with a high near 92. Heat index values as high as 99. Calm wind becoming northwest around 5 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 68. Calm wind.
Sunday
Sunny, with a high near 90. Calm wind becoming north northwest around 5 mph in the afternoon.
Sunday Night
Partly cloudy, with a low around 64. Calm wind.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 89. Calm wind becoming northwest around 5 mph.
Monday Night
A 30 percent chance of showers and thunderstorms, mainly after 1am. Mostly cloudy, with a low around 65. Calm wind.
Tuesday
A 30 percent chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 89. Calm wind.
Tuesday Night
A chance of showers and thunderstorms. Partly cloudy, with a low around 68. Chance of precipitation is 40%.
Wednesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
Wednesday Night
A 50 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 68.
Thursday
A 30 percent chance of showers and thunderstorms. Mostly sunny, with a high near 90.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Williamsport TN
 35.65°N 87.24°W (Elev. 577 ft)
Last Update:
1:31 am CDT Aug 21, 2026
Forecast Valid:
5am CDT Aug 21, 2026-6pm CDT Aug 27, 2026
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation