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

93°F

34°C

Humidity 41%
Wind Speed Calm
Barometer 30.24 in
Dewpoint 66°F (19°C)
Visibility 10.00 mi
Heat Index96°F (36°C)
Last update 16 Sep 4:55 pm CDT
Extended Forecast for

4 Miles NNE Greenbrier TN

Heat Advisory September 16, 05:13pm until September 19, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory September 16, 05:13pm until September 19, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Tonight

    Low: 74 °F

    Mostly Clear

  • Thursday

    Thursday: Sunny and hot, with a high near 99. Heat index values as high as 105. Calm wind becoming west northwest around 5 mph.

    High: 99 °F

    Hot

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 74. Calm wind.

    Low: 74 °F

    Mostly Clear

  • Friday

    Friday: Sunny and hot, with a high near 97. Heat index values as high as 106. Calm wind becoming north northwest around 5 mph in the afternoon.

    High: 97 °F

    Hot

  • Friday Night

    Friday Night: Mostly clear, with a low around 72. Northeast wind around 5 mph becoming calm.

    Low: 72 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny and hot, with a high near 97. Calm wind becoming west southwest around 5 mph.

    High: 97 °F

    Hot

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 73. Calm wind becoming south around 5 mph after midnight.

    Low: 73 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny and hot, with a high near 97. South wind around 5 mph becoming west in the afternoon.

    High: 97 °F

    Hot

Detailed Forecast

Tonight
Mostly clear, with a low around 74. East southeast wind around 5 mph becoming south after midnight.
Thursday
Sunny and hot, with a high near 99. Heat index values as high as 105. Calm wind becoming west northwest around 5 mph.
Thursday Night
Mostly clear, with a low around 74. Calm wind.
Friday
Sunny and hot, with a high near 97. Heat index values as high as 106. Calm wind becoming north northwest around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 72. Northeast wind around 5 mph becoming calm.
Saturday
Sunny and hot, with a high near 97. Calm wind becoming west southwest around 5 mph.
Saturday Night
Mostly clear, with a low around 73. Calm wind becoming south around 5 mph after midnight.
Sunday
Mostly sunny and hot, with a high near 97. South wind around 5 mph becoming west in the afternoon.
Sunday Night
Partly cloudy, with a low around 73. East wind around 5 mph becoming south after midnight.
Monday
A 20 percent chance of showers and thunderstorms after 1pm. Mostly sunny, with a high near 95.
Monday Night
A 30 percent chance of showers and thunderstorms. Partly cloudy, with a low around 69.
Tuesday
A 40 percent chance of showers and thunderstorms. Mostly sunny, with a high near 91.
Tuesday Night
A 20 percent chance of showers. Partly cloudy, with a low around 67.
Wednesday
A 30 percent chance of showers. Mostly sunny, with a high near 88.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
4 Miles NNE Greenbrier TN
 36.48°N 86.76°W (Elev. 705 ft)
Last Update:
1:31 pm CDT Sep 16, 2026
Forecast Valid:
5pm CDT Sep 16, 2026-6pm CDT Sep 23, 2026
 
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Additional Resources

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