Heidelberg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Heidelberg, 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 Heidelberg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Mostly Sunny | 8 mph N | 10% |
| Tonight | 59°F | Partly Cloudy | 3 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 | 57% |
| Sunday | 78°F | Showers And Thunderstorms | 6 to 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 | 13 mph E | 61% |
| Tuesday | 66°F | Showers And Thunderstorms Likely | 14 mph E | 69% |
| Tuesday Night | 55°F | Showers And Thunderstorms Likely | 15 mph E | 69% |
| Wednesday | 64°F | Showers And Thunderstorms Likely | 14 mph E | 65% |
| Wednesday Night | 54°F | Chance Showers And Thunderstorms | 9 to 13 mph E | 52% |
| Thursday | 65°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 Heidelberg (40.391, -80.092). Updated through the day.
Growing snapshot for Heidelberg
Last spring frost
Apr 18
First fall frost
Oct 28
Growing season
193 days
Hardiness zone
6b
More local growing data for Heidelberg: nearby ZIP 15243 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Pittsburgh Allegheny Co Ap, Pa (8.2 mi from Heidelberg). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.