Smithville, TN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithville, a city in Dekalb County, Tennessee.
Overnight
70°F
Mostly Clear
Mostly clear, with a low around 70. Southeast wind around 0 mph.
7-day forecast for Smithville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 70°F | Mostly Clear | 0 mph | 1% |
| Saturday | 96°F | Patchy Fog then Slight Chance Showers And Thunderstorms | 0 mph | 21% |
| Saturday Night | 70°F | Mostly Clear | 0 to 5 mph SSE | 10% |
| Sunday | 95°F | Mostly Sunny | 5 mph SW | 8% |
| Sunday Night | 69°F | Partly Cloudy | 0 to 5 mph S | 12% |
| Monday | 93°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph WSW | 36% |
| Monday Night | 66°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 to 5 mph ESE | 62% |
| Tuesday | 86°F | Showers And Thunderstorms Likely | 0 to 5 mph WNW | 70% |
| Tuesday Night | 63°F | Showers And Thunderstorms Likely | 0 to 5 mph NNE | 70% |
| Wednesday | 80°F | Rain Showers Likely | 0 to 5 mph NNW | 58% |
| Wednesday Night | 60°F | Chance Showers And Thunderstorms | 0 to 5 mph N | 54% |
| Thursday | 79°F | Slight Chance Rain Showers | 0 to 5 mph N | 23% |
| Thursday Night | 57°F | Slight Chance Rain Showers then Partly Cloudy | 0 to 5 mph NNE | 23% |
| Friday | 79°F | Mostly Sunny | 0 to 10 mph N | 6% |
Forecast source: National Weather Service (api.weather.gov) for Smithville (35.958, -85.821). Updated through the day.
Growing snapshot for Smithville
Last spring frost
Apr 18
First fall frost
Oct 22
Growing season
187 days
Hardiness zone
7b
More local growing data for Smithville: nearby ZIP 37166 weather · frost dates · planting calendar · Tennessee frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Smithville 2 Se, Tn (1.7 mi from Smithville). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.