West Mifflin, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for West Mifflin, a borough in Allegheny County, Pennsylvania.
Overnight
58°F
Clear
Clear, with a low around 58. Northeast wind around 5 mph.
7-day forecast for West Mifflin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 58°F | Clear | 5 mph NE | 0% |
| Tuesday | 86°F | Sunny | 0 to 5 mph E | 0% |
| Tuesday Night | 68°F | Partly Cloudy | 7 mph SE | 1% |
| Wednesday | 86°F | Partly Sunny then Isolated Showers And Thunderstorms | 6 mph S | 21% |
| Wednesday Night | 69°F | Scattered Showers And Thunderstorms | 6 mph S | 50% |
| Thursday | 84°F | Showers And Thunderstorms Likely | 8 mph SW | 73% |
| Thursday Night | 69°F | Showers And Thunderstorms Likely | 7 mph SW | 73% |
| Friday | 83°F | Showers And Thunderstorms | 8 mph SW | 82% |
| Friday Night | 68°F | Showers And Thunderstorms | 7 mph SW | 82% |
| Saturday | 82°F | Showers And Thunderstorms Likely | 9 mph SW | 55% |
| Saturday Night | 68°F | Showers And Thunderstorms Likely | 8 mph SW | 55% |
| Sunday | 85°F | Slight Chance Showers And Thunderstorms | 9 mph SW | 22% |
| Sunday Night | 70°F | Slight Chance Showers And Thunderstorms | 9 mph SW | 23% |
| Monday | 86°F | Chance Showers And Thunderstorms | 12 mph SW | 37% |
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
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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 Aug 4, 2026.