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.

Fair

68°F

20°C

Humidity 30%
Wind Speed Calm
Barometer 30.38 in
Dewpoint 36°F (2°C)
Visibility 10.00 mi
Last update 18 Oct 4:15 pm CDT
Extended Forecast for

Portland TN

  • Tonight

    Tonight: Patchy fog after 4am. Otherwise, clear, with a low around 41. Calm wind.

    Low: 41 °F

    Clear then
    Patchy Fog

  • Monday

    Monday: Patchy fog before 8am. Otherwise, sunny, with a high near 70. Calm wind becoming northwest around 5 mph in the afternoon.

    High: 70 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Mostly clear, with a low around 42. Calm wind.

    Low: 42 °F

    Mostly Clear

  • Tuesday

    Tuesday: Sunny, with a high near 73. Light northeast wind increasing to 5 to 10 mph in the afternoon.

    High: 73 °F

    Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 43. North northeast wind around 5 mph becoming calm after midnight.

    Low: 43 °F

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 73. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 73 °F

    Sunny

  • Wednesday Night

    Wednesday Night: Clear, with a low around 43. North northeast wind around 5 mph becoming calm.

    Low: 43 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 73. Calm wind becoming north northeast around 5 mph in the afternoon.

    High: 73 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 45. North northeast wind around 5 mph becoming calm.

    Low: 45 °F

    Clear

Detailed Forecast

Tonight
Patchy fog after 4am. Otherwise, clear, with a low around 41. Calm wind.
Monday
Patchy fog before 8am. Otherwise, sunny, with a high near 70. Calm wind becoming northwest around 5 mph in the afternoon.
Monday Night
Mostly clear, with a low around 42. Calm wind.
Tuesday
Sunny, with a high near 73. Light northeast wind increasing to 5 to 10 mph in the afternoon.
Tuesday Night
Mostly clear, with a low around 43. North northeast wind around 5 mph becoming calm after midnight.
Wednesday
Sunny, with a high near 73. Calm wind becoming north northeast around 5 mph in the afternoon.
Wednesday Night
Clear, with a low around 43. North northeast wind around 5 mph becoming calm.
Thursday
Sunny, with a high near 73. Calm wind becoming north northeast around 5 mph in the afternoon.
Thursday Night
Clear, with a low around 45. North northeast wind around 5 mph becoming calm.
Friday
Sunny, with a high near 73.
Friday Night
Clear, with a low around 45.
Saturday
Sunny, with a high near 75.
Saturday Night
Mostly clear, with a low around 47.
Sunday
Sunny, with a high near 75.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Portland TN
 36.58°N 86.5°W (Elev. 833 ft)
Last Update:
1:31 pm CDT Oct 18, 2026
Forecast Valid:
4pm CDT Oct 18, 2026-6pm CDT Oct 25, 2026
 
Forecast Discussion
 
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Additional Resources

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