Smithton, PA Weather & Growing Conditions

Local forecast, frost dates, hardiness zone and planting guidance for Smithton, a borough in Westmoreland County, Pennsylvania.

This Afternoon

77°F

Sunny

Sunny, with a high near 77. West wind around 2 mph.

7-day forecast for Smithton

When	Temp	Forecast	Wind	Precip
This Afternoon	77°F	Sunny	2 mph W	1%
Tonight	52°F	Mostly Clear	5 mph SE	2%
Wednesday	78°F	Partly Sunny	2 to 8 mph S	6%
Wednesday Night	61°F	Light Rain	8 mph S	99%
Thursday	71°F	Chance Light Rain	7 to 13 mph SW	47%
Thursday Night	50°F	Mostly Cloudy	1 to 6 mph SW	13%
Friday	66°F	Partly Sunny then Slight Chance Light Rain	1 to 7 mph W	16%
Friday Night	44°F	Chance Light Rain	5 mph NW	32%
Saturday	56°F	Chance Light Rain	6 to 12 mph W	31%
Saturday Night	37°F	Chance Light Rain	3 to 8 mph W	31%
Sunday	56°F	Partly Sunny then Slight Chance Light Rain	5 to 12 mph SW	17%
Sunday Night	35°F	Chance Light Rain	10 mph SW	25%
Monday	56°F	Chance Light Rain	10 to 15 mph W	34%
Monday Night	36°F	Chance Light Rain	9 to 14 mph SW	34%

Forecast source: National Weather Service (api.weather.gov) for Smithton (40.154, -79.742). Updated through the day.

Growing snapshot for Smithton

Last spring frost

Apr 27

First fall frost

Oct 22

Growing season

177 days

Hardiness zone

More local growing data for Smithton: nearby ZIP 15448 weather · frost dates · planting calendar · Pennsylvania frost dates

Nearby towns & communities

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Climate data from the nearest NOAA station, Donora 1 Sw, Pa (7.5 mi from Smithton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.