Smithfield, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithfield, a borough in Fayette County, Pennsylvania.
Tonight
60°F
Partly Cloudy then Patchy Fog
Patchy fog between 2am and 5am. Partly cloudy, with a low around 60. Northeast wind around 2 mph.
7-day forecast for Smithfield
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 60°F | Partly Cloudy then Patchy Fog | 2 mph NE | 5% |
| Saturday | 79°F | Mostly Sunny | 3 mph SE | 8% |
| Saturday Night | 65°F | Partly Cloudy then Chance Rain Showers | 5 mph SE | 48% |
| Sunday | 78°F | Showers And Thunderstorms | 8 mph SW | 93% |
| Sunday Night | 63°F | Showers And Thunderstorms | 5 mph NW | 93% |
| Monday | 72°F | Chance Rain Showers | 5 to 8 mph NE | 50% |
| Monday Night | 60°F | Showers And Thunderstorms Likely | 9 mph E | 70% |
| Tuesday | 67°F | Showers And Thunderstorms Likely | 9 to 13 mph E | 74% |
| Tuesday Night | 56°F | Showers And Thunderstorms Likely | 15 mph E | 71% |
| Wednesday | 64°F | Showers And Thunderstorms Likely | 14 mph E | 67% |
| Wednesday Night | 55°F | Chance Showers And Thunderstorms | 8 to 14 mph E | 52% |
| Thursday | 66°F | Chance Rain Showers | 8 mph E | 44% |
| Thursday Night | 54°F | Chance Rain Showers | 2 to 7 mph NE | 37% |
| Friday | 69°F | Slight Chance Rain Showers | 2 to 7 mph N | 21% |
Forecast source: National Weather Service (api.weather.gov) for Smithfield (39.802, -79.809). Updated through the day.
Growing snapshot for Smithfield
Last spring frost
Apr 25
First fall frost
Oct 24
Growing season
181 days
Hardiness zone
6b
More local growing data for Smithfield: nearby ZIP 15478 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
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Climate data from the nearest NOAA station, Lake Lynn, Wv (5.4 mi from Smithfield). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.