Brentwood, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Brentwood, a borough in Allegheny County, Pennsylvania.
Today
75°F
Partly Sunny then Slight Chance Light Rain
A slight chance of rain after 1pm. Partly sunny, with a high near 75. South wind 6 to 12 mph. Chance of precipitation is 20%.
7-day forecast for Brentwood
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Partly Sunny then Slight Chance Light Rain | 6 to 12 mph S | 24% |
| Tonight | 61°F | Light Rain | 13 mph S | 94% |
| Thursday | 69°F | Chance Light Rain then Mostly Sunny | 9 to 15 mph SW | 31% |
| Thursday Night | 49°F | Partly Cloudy | 3 to 7 mph SW | 1% |
| Friday | 63°F | Partly Sunny then Slight Chance Light Rain | 5 to 9 mph SW | 21% |
| Friday Night | 43°F | Chance Light Rain | 7 to 10 mph W | 30% |
| Saturday | 52°F | Chance Light Rain | 10 to 14 mph W | 29% |
| Saturday Night | 38°F | Slight Chance Light Rain | 8 to 12 mph W | 24% |
| Sunday | 54°F | Partly Sunny | 8 to 15 mph W | 7% |
| Sunday Night | 36°F | Partly Cloudy | 12 mph W | 5% |
| Monday | 55°F | Mostly Sunny | 9 to 15 mph W | 10% |
| Monday Night | 37°F | Mostly Clear | 7 to 12 mph SW | 8% |
| Tuesday | 59°F | Sunny | 12 to 17 mph SW | 3% |
| Tuesday Night | 37°F | Partly Cloudy | 6 to 10 mph W | 3% |
Forecast source: National Weather Service (api.weather.gov) for Brentwood (40.373, -79.976). Updated through the day.
Growing snapshot for Brentwood
Last spring frost
Apr 18
First fall frost
Oct 28
Growing season
193 days
Hardiness zone
6b
More local growing data for Brentwood: nearby ZIP 15227 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Pittsburgh Allegheny Co Ap, Pa (2.9 mi from Brentwood). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.