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

Hazardous Weather Conditions

Current conditions at

Portland Municipal Airport (K1M5)

Lat: 36.59°NLon: 86.48°WElev: 818ft.

Fair

90°F

32°C

Humidity 59%
Wind Speed W 6 mph
Barometer 29.89 in
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Heat Index99°F (37°C)
Last update 12 Aug 6:15 pm CDT
Extended Forecast for

Portland TN

Heat Advisory August 12, 06:38pm until August 16, 07:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 12, 06:38pm until August 16, 07:00pm

    NOW until 7:00pm Sun

    Heat Advisory

  • Tonight

    Low: 74 °F

    Slight Chance
    T-storms then
    Slight Chance
    Showers

  • Thursday

    Thursday: A slight chance of showers between 8am and 10am. Mostly sunny, with a high near 93. Heat index values as high as 103. West southwest wind 5 to 10 mph. Chance of precipitation is 20%.

    High: 93 °F

    Slight Chance
    Showers then
    Mostly Sunny

  • Thursday Night

    Thursday Night: Partly cloudy, with a low around 76. West wind around 5 mph becoming south in the evening.

    Low: 76 °F

    Partly Cloudy

  • Friday

    Friday: Sunny, with a high near 95. Heat index values as high as 105. South southwest wind around 5 mph.

    High: 95 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 75. Calm wind becoming south southwest around 5 mph.

    Low: 75 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 96. Southwest wind around 5 mph.

    High: 96 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 75. Calm wind becoming south southwest around 5 mph.

    Low: 75 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny and hot, with a high near 97. West southwest wind around 5 mph.

    High: 97 °F

    Hot

Detailed Forecast

Tonight
A slight chance of showers and thunderstorms before midnight, then a slight chance of showers between midnight and 1am. Partly cloudy, with a low around 74. South southwest wind around 5 mph. Chance of precipitation is 20%.
Thursday
A slight chance of showers between 8am and 10am. Mostly sunny, with a high near 93. Heat index values as high as 103. West southwest wind 5 to 10 mph. Chance of precipitation is 20%.
Thursday Night
Partly cloudy, with a low around 76. West wind around 5 mph becoming south in the evening.
Friday
Sunny, with a high near 95. Heat index values as high as 105. South southwest wind around 5 mph.
Friday Night
Mostly clear, with a low around 75. Calm wind becoming south southwest around 5 mph.
Saturday
Sunny, with a high near 96. Southwest wind around 5 mph.
Saturday Night
Mostly clear, with a low around 75. Calm wind becoming south southwest around 5 mph.
Sunday
Sunny and hot, with a high near 97. West southwest wind around 5 mph.
Sunday Night
Mostly clear, with a low around 77. West southwest wind around 5 mph.
Monday
Sunny, with a high near 96.
Monday Night
Partly cloudy, with a low around 73.
Tuesday
A 20 percent chance of showers and thunderstorms. Mostly sunny, with a high near 93.
Tuesday Night
Partly cloudy, with a low around 72.
Wednesday
A 20 percent chance of showers and thunderstorms. Sunny, with a high near 93.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portland TN
 36.58°N 86.53°W (Elev. 810 ft)
Last Update:
1:31 pm CDT Aug 12, 2026
Forecast Valid:
6pm CDT Aug 12, 2026-6pm CDT Aug 19, 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