Swarthmore, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Swarthmore, a borough in Delaware County, Pennsylvania.
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. Northeast wind 0 to 5 mph.
7-day forecast for Swarthmore
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 0 to 5 mph NE | 0% |
| Tonight | 68°F | Mostly Cloudy | 0 to 5 mph E | 7% |
| Wednesday | 85°F | Chance Showers And Thunderstorms | 0 to 5 mph SE | 74% |
| Wednesday Night | 73°F | Showers And Thunderstorms Likely then Slight Chance Showers And Thunderstorms | 5 mph S | 65% |
| Thursday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 22% |
| Thursday Night | 74°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 to 10 mph SW | 28% |
| Friday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 37% |
| Friday Night | 73°F | Chance Showers And Thunderstorms | 5 mph SW | 43% |
| Saturday | 88°F | Partly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 36% |
| Saturday Night | 72°F | Chance Showers And Thunderstorms | 5 mph SW | 36% |
| Sunday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 mph W | 16% |
| Sunday Night | 73°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 5 mph SW | 16% |
| Monday | 90°F | Sunny | 5 to 10 mph W | 10% |
| Monday Night | 73°F | Slight Chance Showers And Thunderstorms | 5 mph W | 16% |
Forecast source: National Weather Service (api.weather.gov) for Swarthmore (39.902, -75.349). Updated through the day.
Growing snapshot for Swarthmore
Last spring frost
Apr 2
First fall frost
Nov 10
Growing season
224 days
Hardiness zone
7b
More local growing data for Swarthmore: nearby ZIP 19081 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Philadelphia Intl Ap, Pa (6.5 mi from Swarthmore). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.