Smithfield, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Smithfield, a borough in Fayette County, Pennsylvania.
This Afternoon
77°F
Sunny
Sunny, with a high near 77. Southwest wind around 2 mph.
7-day forecast for Smithfield
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 77°F | Sunny | 2 mph SW | 1% |
| Tonight | 53°F | Mostly Clear | 3 mph S | 3% |
| Wednesday | 77°F | Partly Sunny | 2 to 7 mph S | 7% |
| Wednesday Night | 61°F | Light Rain | 8 mph S | 99% |
| Thursday | 70°F | Chance Light Rain | 6 to 12 mph SW | 37% |
| Thursday Night | 52°F | Mostly Cloudy then Slight Chance Light Rain | 1 to 5 mph SW | 16% |
| Friday | 66°F | Slight Chance Light Rain | 1 to 6 mph W | 23% |
| Friday Night | 45°F | Chance Light Rain | 0 to 3 mph NW | 36% |
| Saturday | 55°F | Chance Light Rain | 3 to 9 mph W | 37% |
| Saturday Night | 38°F | Chance Light Rain | 1 to 6 mph W | 37% |
| Sunday | 55°F | Partly Sunny then Slight Chance Light Rain | 2 to 9 mph SW | 17% |
| Sunday Night | 36°F | Chance Light Rain | 7 mph SW | 28% |
| Monday | 56°F | Chance Light Rain | 7 to 14 mph W | 35% |
| Monday Night | 37°F | Chance Light Rain | 7 to 10 mph SW | 35% |
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
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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 Nov 4, 2026.