Decatur, TN Weather & Growing Conditions
This Afternoon
79°F
Mostly Sunny
Mostly sunny. High near 79, with temperatures falling to around 75 in the afternoon. South wind 10 to 15 mph, with gusts as high as 25 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Mostly Sunny | 10 to 15 mph S | 1% |
| Tonight | 63°F | Mostly Cloudy then Chance Showers And Thunderstorms | 5 to 10 mph S | 34% |
| Wednesday | 71°F | Showers And Thunderstorms | 10 to 15 mph S | 99% |
| Wednesday Night | 59°F | Showers And Thunderstorms then Mostly Cloudy | 0 to 5 mph SW | 82% |
| Thursday | 74°F | Mostly Sunny | 0 to 5 mph W | 10% |
| Thursday Night | 48°F | Mostly Cloudy | 0 mph | 8% |
| Friday | 72°F | Mostly Sunny | 0 to 5 mph NW | 4% |
| Friday Night | 43°F | Mostly Clear | 0 to 5 mph NW | 2% |
| Saturday | 65°F | Mostly Sunny | 0 to 5 mph N | 1% |
| Saturday Night | 37°F | Partly Cloudy | 0 to 5 mph N | 1% |
| Sunday | 65°F | Mostly Sunny | 0 to 5 mph N | 6% |
| Sunday Night | 34°F | Mostly Clear | 0 mph | 7% |
| Monday | 64°F | Sunny | 0 to 5 mph NW | 7% |
| Monday Night | 34°F | Mostly Clear | 0 mph | 3% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Decatur, TN
Last spring frost
Apr 4
First fall frost
Oct 31
Growing season
208 days
Hardiness zone
7b
Explore more for Decatur, TN: full frost dates · planting calendar · Tennessee frost dates
Climate data from the nearest NOAA station, Dayton 2Se, Tn (9.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.