Petros, TN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Petros, a community in Morgan County, Tennessee.
Tonight
61°F
Mostly Cloudy then Slight Chance Rain Showers
A slight chance of rain showers after 2am. Mostly cloudy, with a low around 61. South wind 5 to 10 mph, with gusts as high as 25 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Petros
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 61°F | Mostly Cloudy then Slight Chance Rain Showers | 5 to 10 mph S | 21% |
| Wednesday | 67°F | Showers And Thunderstorms | 10 mph S | 94% |
| Wednesday Night | 58°F | Showers And Thunderstorms then Mostly Cloudy | 0 to 10 mph SW | 97% |
| Thursday | 70°F | Mostly Sunny | 0 to 5 mph W | 8% |
| Thursday Night | 51°F | Mostly Cloudy | 0 mph | 8% |
| Friday | 68°F | Sunny | 0 to 5 mph NW | 3% |
| Friday Night | 45°F | Partly Cloudy | 5 mph N | 3% |
| Saturday | 60°F | Mostly Sunny | 5 mph N | 1% |
| Saturday Night | 40°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Sunday | 61°F | Mostly Sunny | 0 to 5 mph NW | 7% |
| Sunday Night | 39°F | Mostly Clear | 0 to 5 mph NW | 7% |
| Monday | 61°F | Sunny | 0 to 5 mph W | 7% |
| Monday Night | 39°F | Mostly Clear | 0 mph | 6% |
| Tuesday | 65°F | Sunny | 0 to 5 mph W | 1% |
Forecast source: National Weather Service (api.weather.gov) for Petros (36.103, -84.450). Updated through the day.
Growing snapshot for Petros
Last spring frost
Mar 31
First fall frost
Nov 4
Growing season
218 days
Hardiness zone
7a
More local growing data for Petros: nearby ZIP 37845 weather · frost dates · planting calendar · Tennessee frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Oak Ridge Asos, Tn (13.1 mi from Petros). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.