Liberty, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Liberty, a borough in Allegheny County, Pennsylvania.
This Afternoon
78°F
Sunny
Sunny, with a high near 78. South wind around 3 mph.
7-day forecast for Liberty
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 78°F | Sunny | 3 mph S | 1% |
| Tonight | 52°F | Mostly Clear | 5 mph SE | 2% |
| Wednesday | 78°F | Partly Sunny | 2 to 10 mph S | 8% |
| Wednesday Night | 61°F | Light Rain | 9 mph S | 98% |
| Thursday | 71°F | Chance Light Rain | 8 to 14 mph SW | 38% |
| Thursday Night | 49°F | Partly Cloudy | 1 to 7 mph SW | 6% |
| Friday | 66°F | Partly Sunny | 1 to 7 mph W | 11% |
| Friday Night | 44°F | Chance Light Rain | 2 to 6 mph NW | 27% |
| Saturday | 56°F | Chance Light Rain | 6 to 13 mph W | 29% |
| Saturday Night | 37°F | Chance Light Rain then Mostly Cloudy | 3 to 9 mph W | 26% |
| Sunday | 56°F | Partly Sunny then Slight Chance Light Rain | 3 to 12 mph SW | 17% |
| Sunday Night | 36°F | Slight Chance Light Rain | 10 mph W | 21% |
| Monday | 56°F | Chance Light Rain | 9 to 16 mph W | 31% |
| Monday Night | 36°F | Chance Light Rain then Partly Cloudy | 9 to 13 mph SW | 31% |
Forecast source: National Weather Service (api.weather.gov) for Liberty (40.322, -79.863). Updated through the day.
Growing snapshot for Liberty
Last spring frost
May 2
First fall frost
Oct 20
Growing season
170 days
Hardiness zone
6b
More local growing data for Liberty: nearby ZIP 15133 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Mckeesport, Pa (0.9 mi from Liberty). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.