Decatur, TN Weather & Growing Conditions
Today
95°F
Sunny then Chance Showers And Thunderstorms
A chance of showers and thunderstorms after 4pm. Sunny. High near 95, with temperatures falling to around 92 in the afternoon. Heat index values as high as 103. North wind around 0 mph. Chance of precipitation is 30%.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 95°F | Sunny then Chance Showers And Thunderstorms | 0 mph | 29% |
| Tonight | 70°F | Chance Showers And Thunderstorms then Partly Cloudy | 0 mph | 27% |
| Sunday | 93°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 26% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 0 mph | 33% |
| Monday | 93°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 mph | 42% |
| Monday Night | 67°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 mph | 64% |
| Tuesday | 87°F | Showers And Thunderstorms | 0 mph | 83% |
| Tuesday Night | 65°F | Showers And Thunderstorms | 0 mph | 83% |
| Wednesday | 81°F | Showers And Thunderstorms Likely | 0 mph | 72% |
| Wednesday Night | 62°F | Showers And Thunderstorms Likely | 0 mph | 72% |
| Thursday | 80°F | Slight Chance Rain Showers | 0 mph | 21% |
| Thursday Night | 60°F | Slight Chance Rain Showers then Partly Cloudy | 0 mph | 21% |
| Friday | 79°F | Mostly Sunny then Slight Chance Rain Showers | 0 to 5 mph N | 17% |
| Friday Night | 58°F | Slight Chance Rain Showers then Partly Cloudy | 0 to 5 mph N | 17% |
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 Sep 19, 2026.