Colwyn, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Colwyn, a borough in Delaware County, Pennsylvania.
Today
78°F
Partly Sunny
Partly sunny, with a high near 78. Northeast wind 5 to 10 mph.
7-day forecast for Colwyn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 78°F | Partly Sunny | 5 to 10 mph NE | 2% |
| Tonight | 63°F | Mostly Cloudy | 5 to 10 mph E | 9% |
| Sunday | 78°F | Rain Showers Likely | 5 to 10 mph S | 60% |
| Sunday Night | 62°F | Showers And Thunderstorms Likely | 5 to 10 mph W | 74% |
| Monday | 71°F | Chance Rain Showers | 10 mph NE | 39% |
| Monday Night | 56°F | Chance Rain Showers | 5 to 10 mph NE | 35% |
| Tuesday | 66°F | Chance Rain Showers | 10 mph NE | 42% |
| Tuesday Night | 55°F | Chance Rain Showers | 10 to 15 mph NE | 39% |
| Wednesday | 65°F | Chance Rain Showers | 15 mph NE | 31% |
| Wednesday Night | 55°F | Chance Rain Showers | 15 mph NE | 33% |
| Thursday | 64°F | Chance Rain Showers | 10 to 15 mph NE | 34% |
| Thursday Night | 54°F | Chance Rain Showers | 10 to 15 mph N | 34% |
| Friday | 67°F | Chance Rain Showers | 10 to 15 mph N | 29% |
| Friday Night | 54°F | Chance Rain Showers | 5 to 10 mph N | 25% |
Forecast source: National Weather Service (api.weather.gov) for Colwyn (39.912, -75.253). Updated through the day.
Growing snapshot for Colwyn
Last spring frost
Apr 2
First fall frost
Nov 10
Growing season
224 days
Hardiness zone
7b
More local growing data for Colwyn: nearby ZIP 19023 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Philadelphia Intl Ap, Pa (3.9 mi from Colwyn). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.