Harriman, TN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harriman, a city in Roane County, Tennessee.
This Afternoon
95°F
Scattered Showers And Thunderstorms
Scattered showers and thunderstorms. Mostly sunny. High near 95, with temperatures falling to around 92 in the afternoon. Heat index values as high as 102. North wind around 0 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Harriman
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 95°F | Scattered Showers And Thunderstorms | 0 mph | 35% |
| Tonight | 70°F | Scattered Showers And Thunderstorms then Partly Cloudy | 0 mph | 28% |
| Saturday | 94°F | Sunny then Chance Showers And Thunderstorms | 0 mph | 40% |
| Saturday Night | 69°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 38% |
| Sunday | 92°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph SW | 21% |
| Sunday Night | 68°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 0 mph | 25% |
| Monday | 92°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 mph | 49% |
| Monday Night | 67°F | Chance Showers And Thunderstorms | 0 mph | 49% |
| Tuesday | 86°F | Showers And Thunderstorms | 0 mph | 77% |
| Tuesday Night | 65°F | Showers And Thunderstorms | 0 mph | 77% |
| Wednesday | 82°F | Showers And Thunderstorms Likely | 0 mph | 60% |
| Wednesday Night | 61°F | Showers And Thunderstorms Likely | 0 mph | 60% |
| Thursday | 79°F | Chance Rain Showers | 0 to 5 mph N | 30% |
| Thursday Night | 59°F | Chance Rain Showers then Partly Cloudy | 0 to 5 mph N | 30% |
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 Sep 19, 2026.