Smithville, TN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithville, a city in Dekalb County, Tennessee.
This Afternoon
77°F
Mostly Sunny
Mostly sunny. High near 77, with temperatures falling to around 71 in the afternoon. South southeast wind around 15 mph, with gusts as high as 25 mph.
7-day forecast for Smithville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Mostly Sunny | 15 mph SSE | 1% |
| Tonight | 61°F | Showers And Thunderstorms Likely | 15 mph SSE | 83% |
| Wednesday | 72°F | Showers And Thunderstorms | 5 to 20 mph SSW | 95% |
| Wednesday Night | 49°F | Patchy Fog | 0 to 5 mph WSW | 11% |
| Thursday | 72°F | Patchy Fog then Mostly Sunny | 0 to 5 mph SW | 0% |
| Thursday Night | 43°F | Areas Of Fog | 0 mph | 0% |
| Friday | 69°F | Areas Of Fog then Mostly Sunny | 0 to 10 mph NNW | 2% |
| Friday Night | 38°F | Partly Cloudy | 0 to 5 mph NNW | 2% |
| Saturday | 61°F | Mostly Sunny | 5 to 10 mph NNW | 0% |
| Saturday Night | 32°F | Mostly Cloudy | 0 to 5 mph NNW | 1% |
| Sunday | 61°F | Mostly Sunny | 0 to 5 mph NNW | 8% |
| Sunday Night | 30°F | Mostly Clear | 0 to 5 mph W | 10% |
| Monday | 63°F | Sunny | 0 to 5 mph W | 5% |
| Monday Night | 31°F | Mostly Clear | 0 mph | 1% |
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 Nov 4, 2026.