Cornwall, PA Weather & Growing Conditions

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

Tonight

51°F

Mostly Clear

Mostly clear, with a low around 51. South wind around 6 mph.

7-day forecast for Cornwall

When	Temp	Forecast	Wind	Precip
Tonight	51°F	Mostly Clear	6 mph S	0%
Wednesday	74°F	Mostly Sunny	2 to 13 mph S	0%
Wednesday Night	60°F	Mostly Cloudy then Chance Rain Showers	12 mph S	51%
Thursday	72°F	Rain Showers	8 to 12 mph S	89%
Thursday Night	60°F	Rain Showers	2 to 8 mph SW	76%
Friday	69°F	Rain Showers Likely	5 mph NW	63%
Friday Night	50°F	Chance Rain Showers	6 mph NW	54%
Saturday	63°F	Slight Chance Rain Showers	6 to 13 mph NW	16%
Saturday Night	42°F	Slight Chance Rain Showers then Partly Cloudy	8 to 12 mph NW	16%
Sunday	59°F	Mostly Sunny	7 to 10 mph W	9%
Sunday Night	40°F	Slight Chance Rain Showers	10 mph W	22%
Monday	59°F	Slight Chance Rain Showers	10 to 17 mph W	22%
Monday Night	38°F	Slight Chance Rain Showers	8 to 14 mph W	20%
Tuesday	62°F	Slight Chance Rain Showers then Sunny	9 to 17 mph W	15%

Forecast source: National Weather Service (api.weather.gov) for Cornwall (40.261, -76.411). Updated through the day.

Growing snapshot for Cornwall

Last spring frost

Apr 20

First fall frost

Oct 25

Growing season

185 days

Hardiness zone

More local growing data for Cornwall: nearby ZIP 17016 weather · frost dates · planting calendar · Pennsylvania frost dates

Nearby towns & communities

Annville Avon Campbelltown Cleona Fort Indiantown Gap Fredericksburg Hebron Jonestown Lebanon Lebanon South Mount Gretna Mount Gretna Heights Myerstown Palmyra Pleasant Hill Quentin Sand Hill Schaefferstown Timber Hills West Myerstown

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Climate data from the nearest NOAA station, Lebanon 2 W, Pa (5.2 mi from Cornwall). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.