Harriman, TN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harriman, a city in Roane County, Tennessee.
Today
89°F
Mostly Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after noon. Mostly sunny. High near 89, with temperatures falling to around 86 in the afternoon. Heat index values as high as 98. North wind around 0 mph. Chance of precipitation is 30%.
7-day forecast for Harriman
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 mph | 28% |
| Tonight | 68°F | Slight Chance Showers And Thunderstorms then Mostly Cloudy | 0 mph | 23% |
| Wednesday | 87°F | Mostly Sunny then Showers And Thunderstorms Likely | 0 mph | 57% |
| Wednesday Night | 69°F | Showers And Thunderstorms Likely then Mostly Cloudy | 0 mph | 59% |
| Thursday | 87°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 62% |
| Thursday Night | 69°F | Showers And Thunderstorms Likely then Partly Cloudy | 0 mph | 62% |
| Friday | 88°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 52% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 0 mph | 52% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 0 mph | 63% |
| Saturday Night | 69°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 mph | 63% |
| Sunday | 88°F | Chance Showers And Thunderstorms | 0 mph | 42% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 42% |
| Monday | 89°F | Chance Showers And Thunderstorms | 0 mph | 42% |
| Monday Night | 71°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 41% |
Forecast source: National Weather Service (api.weather.gov) for Harriman (35.930, -84.563). Updated through the day.
Growing snapshot for Harriman
Last spring frost
Apr 3
First fall frost
Nov 4
Growing season
215 days
Hardiness zone
7b
More local growing data for Harriman: nearby ZIP 37748 weather · frost dates · planting calendar · Tennessee frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Kingston, Tn (6.1 mi from Harriman). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.