Carnegie, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Carnegie, a borough in Allegheny County, Pennsylvania.
This Afternoon
77°F
Mostly Sunny
Mostly sunny, with a high near 77. North wind around 8 mph.
7-day forecast for Carnegie
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Mostly Sunny | 8 mph N | 10% |
| Tonight | 59°F | Partly Cloudy | 5 to 8 mph NE | 10% |
| Saturday | 79°F | Partly Sunny | 5 mph E | 6% |
| Saturday Night | 66°F | Mostly Cloudy then Showers And Thunderstorms Likely | 6 mph SE | 58% |
| Sunday | 78°F | Showers And Thunderstorms | 9 mph SW | 95% |
| Sunday Night | 60°F | Showers And Thunderstorms | 9 mph N | 95% |
| Monday | 69°F | Chance Rain Showers | 12 mph NE | 40% |
| Monday Night | 59°F | Showers And Thunderstorms Likely | 12 mph E | 62% |
| Tuesday | 66°F | Showers And Thunderstorms Likely | 14 mph E | 70% |
| Tuesday Night | 56°F | Showers And Thunderstorms Likely | 15 mph E | 69% |
| Wednesday | 65°F | Showers And Thunderstorms Likely | 14 mph E | 65% |
| Wednesday Night | 54°F | Chance Showers And Thunderstorms | 9 to 13 mph E | 52% |
| Thursday | 66°F | Chance Rain Showers | 9 mph E | 40% |
| Thursday Night | 54°F | Slight Chance Rain Showers | 5 to 8 mph NE | 19% |
Forecast source: National Weather Service (api.weather.gov) for Carnegie (40.408, -80.086). Updated through the day.
Growing snapshot for Carnegie
Last spring frost
Apr 24
First fall frost
Oct 27
Growing season
186 days
Hardiness zone
6b
More local growing data for Carnegie: nearby ZIP 15106 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Emsworth L/D Ohio Rvr, Pa (6.7 mi from Carnegie). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.