Colwyn, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Colwyn, a borough in Delaware County, Pennsylvania.
Today
74°F
Sunny
Sunny, with a high near 74. South wind 0 to 5 mph.
7-day forecast for Colwyn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Sunny | 0 to 5 mph S | 2% |
| Tonight | 60°F | Mostly Cloudy | 5 mph S | 1% |
| Thursday | 74°F | Chance Light Rain | 5 to 10 mph S | 46% |
| Thursday Night | 63°F | Light Rain | 0 to 5 mph S | 85% |
| Friday | 70°F | Light Rain | 0 to 5 mph SW | 85% |
| Friday Night | 53°F | Light Rain | 0 to 5 mph N | 82% |
| Saturday | 65°F | Mostly Sunny | 5 to 10 mph NW | 5% |
| Saturday Night | 45°F | Partly Cloudy | 5 to 10 mph W | 7% |
| Sunday | 60°F | Mostly Sunny | 5 to 10 mph NW | 5% |
| Sunday Night | 43°F | Partly Cloudy | 5 mph W | 7% |
| Monday | 59°F | Sunny | 5 to 10 mph W | 7% |
| Monday Night | 41°F | Mostly Clear | 5 to 10 mph W | 5% |
| Tuesday | 63°F | Sunny | 5 to 10 mph SW | 4% |
| Tuesday Night | 43°F | Mostly Clear | 5 to 10 mph W | 0% |
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 Nov 4, 2026.