Brentwood, TN Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Brentwood, a city in Williamson County, Tennessee.
Today
99°F
Sunny
Sunny. High near 99, with temperatures falling to around 95 in the afternoon. Heat index values as high as 104. West wind 0 to 5 mph.
7-day forecast for Brentwood
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 99°F | Sunny | 0 to 5 mph W | 7% |
| Tonight | 73°F | Mostly Clear | 0 to 5 mph SSW | 4% |
| Sunday | 97°F | Sunny | 5 mph SW | 13% |
| Sunday Night | 73°F | Mostly Clear | 5 mph SSW | 13% |
| Monday | 96°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph W | 20% |
| Monday Night | 68°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph NNE | 54% |
| Tuesday | 87°F | Chance Rain Showers then Chance Showers And Thunderstorms | 5 to 10 mph N | 51% |
| Tuesday Night | 65°F | Chance Showers And Thunderstorms | 5 to 10 mph N | 51% |
| Wednesday | 82°F | Chance Rain Showers | 5 mph N | 44% |
| Wednesday Night | 62°F | Chance Rain Showers then Partly Cloudy | 5 mph N | 26% |
| Thursday | 81°F | Mostly Sunny | 5 mph N | 10% |
| Thursday Night | 60°F | Partly Cloudy | 5 mph NNE | 6% |
| Friday | 81°F | Mostly Sunny | 5 to 10 mph NNE | 5% |
| Friday Night | 59°F | Partly Cloudy | 5 to 10 mph NNE | 5% |
Forecast source: National Weather Service (api.weather.gov) for Brentwood (35.994, -86.771). Updated through the day.
Growing snapshot for Brentwood
Last spring frost
Apr 15
First fall frost
Oct 26
Growing season
193 days
Hardiness zone
7b
More local growing data for Brentwood: nearby ZIP 37027 weather · frost dates · planting calendar · Tennessee frost dates
Nearby towns & communities
Climate data from the nearest NOAA station, Brentwood, Tn (0.7 mi from Brentwood). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.