Smithville, TN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithville, a city in Dekalb County, Tennessee.
Today
87°F
Patchy Fog then Chance Showers And Thunderstorms
Patchy fog before 10am, then a chance of showers and thunderstorms. Mostly sunny. High near 87, with temperatures falling to around 83 in the afternoon. North northeast wind 0 to 5 mph. Chance of precipitation is 30%.
7-day forecast for Smithville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Patchy Fog then Chance Showers And Thunderstorms | 0 to 5 mph NNE | 25% |
| Tonight | 68°F | Slight Chance Showers And Thunderstorms then Patchy Fog | 0 to 5 mph NNE | 20% |
| Wednesday | 86°F | Chance Showers And Thunderstorms | 0 mph | 47% |
| Wednesday Night | 68°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph SSE | 36% |
| Thursday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph SSW | 32% |
| Thursday Night | 69°F | Chance Showers And Thunderstorms then Partly Cloudy | 5 mph S | 32% |
| Friday | 88°F | Chance Showers And Thunderstorms | 5 mph S | 45% |
| Friday Night | 69°F | Chance Showers And Thunderstorms | 0 to 5 mph S | 45% |
| Saturday | 88°F | Chance Showers And Thunderstorms | 0 to 5 mph SSW | 65% |
| Saturday Night | 69°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 0 mph | 65% |
| Sunday | 88°F | Chance Showers And Thunderstorms | 0 to 5 mph SSW | 40% |
| Sunday Night | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 40% |
| Monday | 88°F | Chance Showers And Thunderstorms | 0 to 5 mph SSW | 31% |
| Monday Night | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 31% |
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 Aug 4, 2026.