Heidelberg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Heidelberg, a borough in Allegheny County, Pennsylvania.
Today
86°F
Areas Of Fog then Sunny
Areas of fog before 9am. Sunny, with a high near 86. Northeast wind 1 to 5 mph.
7-day forecast for Heidelberg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Areas Of Fog then Sunny | 1 to 5 mph NE | 0% |
| Tonight | 68°F | Partly Cloudy | 5 mph SE | 1% |
| Wednesday | 87°F | Partly Sunny then Scattered Showers And Thunderstorms | 1 to 6 mph S | 34% |
| Wednesday Night | 69°F | Scattered Showers And Thunderstorms | 5 mph S | 50% |
| Thursday | 85°F | Showers And Thunderstorms Likely | 3 to 8 mph SW | 70% |
| Thursday Night | 68°F | Showers And Thunderstorms Likely | 2 to 7 mph SW | 70% |
| Friday | 84°F | Showers And Thunderstorms | 3 to 8 mph SW | 83% |
| Friday Night | 67°F | Showers And Thunderstorms | 3 to 7 mph SW | 83% |
| Saturday | 84°F | Chance Showers And Thunderstorms | 5 to 9 mph SW | 54% |
| Saturday Night | 67°F | Chance Showers And Thunderstorms | 3 to 7 mph SW | 54% |
| Sunday | 86°F | Slight Chance Showers And Thunderstorms | 5 to 9 mph SW | 20% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 6 to 9 mph SW | 23% |
| Monday | 86°F | Slight Chance Showers And Thunderstorms | 8 to 12 mph SW | 35% |
| Monday Night | 69°F | Chance Showers And Thunderstorms | 6 to 10 mph SW | 49% |
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 Aug 4, 2026.