Cornwall, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Cornwall, a borough in Lebanon County, Pennsylvania.
This Afternoon
75°F
Slight Chance Rain Showers
A slight chance of rain showers. Partly sunny, with a high near 75. Southeast wind around 6 mph. Chance of precipitation is 20%.
7-day forecast for Cornwall
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Slight Chance Rain Showers | 6 mph SE | 15% |
| Tonight | 62°F | Rain Showers Likely | 7 to 14 mph SE | 68% |
| Sunday | 78°F | Rain Showers | 9 to 14 mph S | 95% |
| Sunday Night | 57°F | Showers And Thunderstorms then Mostly Cloudy | 7 to 13 mph NW | 86% |
| Monday | 71°F | Partly Sunny then Chance Rain Showers | 12 mph NE | 29% |
| Monday Night | 53°F | Chance Rain Showers | 8 to 15 mph NE | 50% |
| Tuesday | 64°F | Chance Rain Showers | 15 mph NE | 54% |
| Tuesday Night | 50°F | Chance Rain Showers | 16 mph NE | 42% |
| Wednesday | 62°F | Chance Rain Showers | 16 mph NE | 34% |
| Wednesday Night | 50°F | Chance Rain Showers | 17 mph NE | 26% |
| Thursday | 63°F | Slight Chance Rain Showers | 16 mph NE | 24% |
| Thursday Night | 49°F | Slight Chance Rain Showers | 10 to 15 mph NE | 24% |
| Friday | 67°F | Chance Rain Showers | 15 mph N | 26% |
| Friday Night | 50°F | Chance Rain Showers | 13 to 16 mph N | 26% |
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
7a
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
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 Sep 20, 2026.