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
80°F
Mostly Cloudy
Mostly cloudy. High near 80, with temperatures falling to around 72 in the afternoon. South wind around 8 mph, with gusts as high as 21 mph.
7-day forecast for West Mifflin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Mostly Cloudy | 8 mph S | 13% |
| Tonight | 60°F | Light Rain | 10 mph S | 79% |
| Thursday | 68°F | Chance Light Rain then Mostly Sunny | 8 to 12 mph SW | 31% |
| Thursday Night | 49°F | Partly Cloudy | 8 mph SW | 0% |
| Friday | 61°F | Slight Chance Light Rain | 6 to 9 mph W | 22% |
| Friday Night | 42°F | Slight Chance Light Rain | 9 mph W | 22% |
| Saturday | 50°F | Mostly Cloudy then Chance Light Rain | 9 to 13 mph W | 26% |
| Saturday Night | 39°F | Chance Light Rain then Mostly Cloudy | 8 to 12 mph W | 26% |
| Sunday | 54°F | Mostly Sunny | 8 to 13 mph W | 1% |
| Sunday Night | 37°F | Partly Cloudy | 10 mph W | 2% |
| Monday | 57°F | Mostly Sunny | 9 to 13 mph W | 2% |
| Monday Night | 39°F | Mostly Clear | 10 mph SW | 2% |
| Tuesday | 62°F | Sunny | 9 to 13 mph SW | 0% |
| Tuesday Night | 38°F | Partly Cloudy | 6 to 9 mph W | 1% |
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 Nov 4, 2026.