Carnegie, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Carnegie, a borough in Allegheny County, Pennsylvania.
This Afternoon
79°F
Slight Chance Light Rain
A slight chance of rain after 2pm. Mostly cloudy. High near 79, with temperatures falling to around 71 in the afternoon. South wind 8 to 12 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
7-day forecast for Carnegie
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 79°F | Slight Chance Light Rain | 8 to 12 mph S | 17% |
| Tonight | 61°F | Light Rain Likely | 8 to 12 mph S | 71% |
| Thursday | 70°F | Slight Chance Light Rain then Mostly Sunny | 8 to 14 mph SW | 23% |
| Thursday Night | 49°F | Partly Cloudy | 3 to 7 mph SW | 0% |
| Friday | 63°F | Chance Light Rain | 5 to 10 mph W | 26% |
| Friday Night | 41°F | Chance Light Rain | 5 to 8 mph W | 26% |
| Saturday | 53°F | Mostly Cloudy then Chance Light Rain | 8 to 14 mph W | 25% |
| Saturday Night | 38°F | Chance Light Rain then Mostly Cloudy | 7 to 10 mph W | 25% |
| Sunday | 56°F | Mostly Sunny | 7 to 14 mph W | 2% |
| Sunday Night | 36°F | Partly Cloudy | 10 mph W | 1% |
| Monday | 59°F | Mostly Sunny | 8 to 14 mph W | 1% |
| Monday Night | 38°F | Mostly Clear | 9 mph SW | 1% |
| Tuesday | 63°F | Sunny | 9 to 14 mph SW | 0% |
| Tuesday Night | 38°F | Partly Cloudy | 2 to 9 mph W | 1% |
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 Nov 4, 2026.