Heidelberg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Heidelberg, a borough in Allegheny County, Pennsylvania.
Tonight
54°F
Mostly Clear
Mostly clear, with a low around 54. Southeast wind around 5 mph.
7-day forecast for Heidelberg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Mostly Clear | 5 mph SE | 2% |
| Wednesday | 77°F | Partly Sunny | 5 to 10 mph S | 8% |
| Wednesday Night | 61°F | Light Rain | 8 to 12 mph S | 100% |
| Thursday | 70°F | Chance Light Rain then Mostly Sunny | 7 to 14 mph SW | 25% |
| Thursday Night | 48°F | Partly Cloudy | 1 to 6 mph SW | 3% |
| Friday | 65°F | Partly Sunny | 1 to 7 mph W | 10% |
| Friday Night | 45°F | Slight Chance Light Rain | 6 mph NW | 23% |
| Saturday | 56°F | Chance Light Rain | 6 to 12 mph W | 28% |
| Saturday Night | 38°F | Chance Light Rain then Mostly Cloudy | 3 to 8 mph W | 26% |
| Sunday | 56°F | Partly Sunny then Slight Chance Light Rain | 3 to 10 mph W | 15% |
| Sunday Night | 37°F | Slight Chance Light Rain | 9 mph W | 18% |
| Monday | 56°F | Chance Light Rain | 9 to 14 mph W | 27% |
| Monday Night | 38°F | Chance Light Rain then Partly Cloudy | 9 to 13 mph SW | 27% |
| Tuesday | 60°F | Mostly Sunny | 13 to 16 mph W | 8% |
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
Nearby towns & communities
Allison Park
Arnold
Aspinwall
Avalon
Bairdford
Bakerstown
Baldwin
Bell Acres
Bellevue
Ben Avon
Ben Avon Heights
Bethel Park
Blaine Hill
Blawnox
Boston
Brackenridge
Braddock
Braddock Hills
Bradford Woods
Brentwood
Bridgeville
Buena Vista
Bunola
Carnegie
Carnot-Moon
Castle Shannon
Chalfant
Cheswick
Churchill
Clairton
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 Nov 4, 2026.