Colwyn, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Colwyn, a borough in Delaware County, Pennsylvania.
Today
87°F
Mostly Sunny
Mostly sunny, with a high near 87. Northeast wind 0 to 5 mph.
7-day forecast for Colwyn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 87°F | Mostly Sunny | 0 to 5 mph NE | 0% |
| Tonight | 70°F | Mostly Cloudy | 0 to 5 mph E | 7% |
| Wednesday | 86°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 71% |
| Wednesday Night | 74°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 mph S | 69% |
| Thursday | 91°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 21% |
| Thursday Night | 75°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SW | 27% |
| Friday | 91°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 36% |
| Friday Night | 74°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 43% |
| Saturday | 89°F | Partly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 37% |
| Saturday Night | 73°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 37% |
| Sunday | 90°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 16% |
| Sunday Night | 74°F | Slight Chance Showers And Thunderstorms then Mostly Clear | 5 mph SW | 16% |
| Monday | 92°F | Sunny | 5 to 10 mph W | 9% |
| Monday Night | 74°F | Slight Chance Showers And Thunderstorms | 5 mph W | 15% |
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 Aug 4, 2026.