West Mifflin, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for West Mifflin, a borough in Allegheny County, Pennsylvania.
This Afternoon
76°F
Partly Sunny
Partly sunny, with a high near 76. North wind around 8 mph.
7-day forecast for West Mifflin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Partly Sunny | 8 mph N | 11% |
| Tonight | 58°F | Partly Cloudy | 8 mph NE | 10% |
| Saturday | 78°F | Partly Sunny | 7 mph E | 4% |
| Saturday Night | 65°F | Mostly Cloudy then Showers And Thunderstorms Likely | 5 to 8 mph SE | 60% |
| Sunday | 76°F | Showers And Thunderstorms | 9 mph SW | 95% |
| Sunday Night | 60°F | Showers And Thunderstorms | 10 mph N | 95% |
| Monday | 68°F | Chance Rain Showers | 10 mph NE | 40% |
| Monday Night | 58°F | Showers And Thunderstorms Likely | 12 mph E | 65% |
| Tuesday | 65°F | Showers And Thunderstorms Likely | 14 mph E | 73% |
| Tuesday Night | 55°F | Showers And Thunderstorms Likely | 14 mph E | 70% |
| Wednesday | 64°F | Showers And Thunderstorms Likely | 14 mph E | 65% |
| Wednesday Night | 54°F | Chance Showers And Thunderstorms | 9 to 14 mph E | 52% |
| Thursday | 64°F | Chance Rain Showers | 9 mph E | 40% |
| Thursday Night | 53°F | Slight Chance Rain Showers | 9 mph NE | 21% |
Forecast source: National Weather Service (api.weather.gov) for West Mifflin (40.358, -79.905). Updated through the day.
Growing snapshot for West Mifflin
Last spring frost
Apr 18
First fall frost
Oct 28
Growing season
193 days
Hardiness zone
6b
More local growing data for West Mifflin: nearby ZIP 15122 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 (1.4 mi from West Mifflin). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.