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

Portland Municipal Airport (K1M5)

Lat: 36.59°NLon: 86.48°WElev: 818ft.

Mostly Cloudy

73°F

23°C

Humidity 100%
Wind Speed S 9 mph
Barometer 29.93 in
Dewpoint 73°F (23°C)
Visibility 9.00 mi
Last update 22 May 11:55 am CDT
Extended Forecast for

Portland TN

  • This Afternoon

    This Afternoon: Showers and possibly a thunderstorm. High near 74. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    High: 74 °F

    Showers

  • Tonight

    Tonight: Showers and thunderstorms likely before 3am, then showers likely and possibly a thunderstorm between 3am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 63. South wind around 10 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 63 °F

    Showers
    Likely

  • Saturday

    Saturday: A chance of showers, with thunderstorms also possible after 10am. Cloudy, then gradually becoming mostly sunny, with a high near 79. Southwest wind 5 to 10 mph. Chance of precipitation is 40%.

    High: 79 °F

    Chance
    Showers then
    Chance
    T-storms

  • Saturday Night

    Saturday Night: A chance of showers and thunderstorms between midnight and 1am, then a slight chance of showers. Patchy fog between 10pm and 1am. Otherwise, mostly cloudy, with a low around 63. Calm wind. Chance of precipitation is 30%.

    Low: 63 °F

    Chance
    Showers and
    Patchy Fog

  • Sunday

    Sunday: Showers likely, then showers and possibly a thunderstorm after 10am. High near 81. South wind around 5 mph. Chance of precipitation is 80%.

    High: 81 °F

    Showers

  • Sunday Night

    Sunday Night: Showers likely and possibly a thunderstorm before 10pm, then showers likely between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 64. Calm wind. Chance of precipitation is 70%.

    Low: 64 °F

    Showers
    Likely and
    Patchy Fog

  • Memorial Day

    Memorial Day: Showers and possibly a thunderstorm. High near 79. Calm wind becoming east southeast around 5 mph. Chance of precipitation is 80%.

    High: 79 °F

    Showers

  • Monday Night

    Monday Night: Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. East southeast wind around 5 mph. Chance of precipitation is 60%.

    Low: 65 °F

    Showers
    Likely

  • Tuesday

    Tuesday: Showers and possibly a thunderstorm. High near 81. South wind around 5 mph. Chance of precipitation is 80%.

    High: 81 °F

    Showers

Detailed Forecast

This Afternoon
Showers and possibly a thunderstorm. High near 74. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.
Tonight
Showers and thunderstorms likely before 3am, then showers likely and possibly a thunderstorm between 3am and 4am, then a chance of showers and thunderstorms after 4am. Mostly cloudy, with a low around 63. South wind around 10 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A chance of showers, with thunderstorms also possible after 10am. Cloudy, then gradually becoming mostly sunny, with a high near 79. Southwest wind 5 to 10 mph. Chance of precipitation is 40%.
Saturday Night
A chance of showers and thunderstorms between midnight and 1am, then a slight chance of showers. Patchy fog between 10pm and 1am. Otherwise, mostly cloudy, with a low around 63. Calm wind. Chance of precipitation is 30%.
Sunday
Showers likely, then showers and possibly a thunderstorm after 10am. High near 81. South wind around 5 mph. Chance of precipitation is 80%.
Sunday Night
Showers likely and possibly a thunderstorm before 10pm, then showers likely between 10pm and 1am, then showers likely and possibly a thunderstorm after 1am. Patchy fog after midnight. Otherwise, mostly cloudy, with a low around 64. Calm wind. Chance of precipitation is 70%.
Memorial Day
Showers and possibly a thunderstorm. High near 79. Calm wind becoming east southeast around 5 mph. Chance of precipitation is 80%.
Monday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 65. East southeast wind around 5 mph. Chance of precipitation is 60%.
Tuesday
Showers and possibly a thunderstorm. High near 81. South wind around 5 mph. Chance of precipitation is 80%.
Tuesday Night
A chance of showers and thunderstorms, then showers likely and possibly a thunderstorm after 1am. Mostly cloudy, with a low around 67. Chance of precipitation is 60%.
Wednesday
Showers and possibly a thunderstorm. High near 83. Chance of precipitation is 80%.
Wednesday Night
A 30 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 67.
Thursday
Showers and thunderstorms likely. Partly sunny, with a high near 84. Chance of precipitation is 60%.
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ABOUT THIS FORECAST

 
Point Forecast:
Portland TN
 36.6°N 86.53°W (Elev. 801 ft)
Last Update:
5:31 am CDT May 22, 2026
Forecast Valid:
12pm CDT May 22, 2026-6pm CDT May 28, 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