Karns, TN Weather & Growing Conditions
Today
89°F
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 2pm. Mostly sunny. High near 89, with temperatures falling to around 86 in the afternoon. Heat index values as high as 96. North wind around 0 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 mph | 35% |
| Tonight | 70°F | Chance Showers And Thunderstorms then Mostly Cloudy | 0 mph | 36% |
| Wednesday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 53% |
| Wednesday Night | 70°F | Chance Showers And Thunderstorms | 0 mph | 52% |
| Thursday | 87°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 51% |
| Thursday Night | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SW | 51% |
| Friday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 38% |
| Friday Night | 70°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 38% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 49% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms | 0 mph | 49% |
| Sunday | 88°F | Chance Showers And Thunderstorms | 0 mph | 36% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 36% |
| Monday | 89°F | Chance Showers And Thunderstorms | 0 mph | 40% |
| Monday Night | 72°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 40% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Karns, TN
Last spring frost
Mar 31
First fall frost
Nov 4
Growing season
218 days
Hardiness zone
7b
Explore more for Karns, TN: full frost dates · planting calendar · Tennessee frost dates
Climate data from the nearest NOAA station, Oak Ridge Asos, Tn (7 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.