Portland, TN Weather & Growing Conditions
Tonight
63°F
Showers And Thunderstorms
Showers and thunderstorms after 9pm. Mostly cloudy, with a low around 63. South southeast wind around 15 mph, with gusts as high as 25 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 63°F | Showers And Thunderstorms | 15 mph SSE | 97% |
| Wednesday | 73°F | Showers And Thunderstorms | 5 to 15 mph SSW | 94% |
| Wednesday Night | 47°F | Partly Cloudy then Patchy Fog | 0 to 5 mph WSW | 1% |
| Thursday | 70°F | Patchy Fog then Mostly Sunny | 0 to 5 mph SW | 0% |
| Thursday Night | 45°F | Areas Of Fog | 0 mph | 0% |
| Friday | 66°F | Areas Of Fog then Mostly Sunny | 0 to 10 mph NW | 1% |
| Friday Night | 39°F | Partly Cloudy | 5 mph NNW | 1% |
| Saturday | 59°F | Mostly Sunny | 5 mph NNW | 0% |
| Saturday Night | 35°F | Partly Cloudy | 0 to 5 mph NNW | 1% |
| Sunday | 60°F | Mostly Sunny | 0 to 5 mph NW | 6% |
| Sunday Night | 33°F | Mostly Clear | 0 to 5 mph W | 9% |
| Monday | 62°F | Sunny | 0 to 5 mph WSW | 6% |
| Monday Night | 35°F | Mostly Clear | 0 to 5 mph SW | 1% |
| Tuesday | 66°F | Sunny | 0 to 5 mph SW | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Portland, TN
Last spring frost
Apr 5
First fall frost
Nov 1
Growing season
210 days
Hardiness zone
7b
Explore more for Portland, TN: full frost dates · planting calendar · Tennessee frost dates
Climate data from the nearest NOAA station, Portland Sewage Plt, Tn (1.7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.