Swarthmore, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Swarthmore, a borough in Delaware County, Pennsylvania.
This Afternoon
83°F
Mostly Sunny
Mostly sunny, with a high near 83. North wind 5 to 10 mph.
7-day forecast for Swarthmore
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 83°F | Mostly Sunny | 5 to 10 mph N | 0% |
| Tonight | 61°F | Partly Cloudy | 5 to 10 mph N | 0% |
| Saturday | 75°F | Mostly Sunny | 5 to 10 mph E | 2% |
| Saturday Night | 64°F | Mostly Cloudy then Patchy Fog | 5 to 10 mph E | 14% |
| Sunday | 77°F | Showers And Thunderstorms | 5 to 10 mph SE | 78% |
| Sunday Night | 63°F | Showers And Thunderstorms | 5 to 10 mph W | 82% |
| Monday | 70°F | Chance Rain Showers | 10 mph NE | 46% |
| Monday Night | 60°F | Chance Rain Showers | 10 mph NE | 32% |
| Tuesday | 65°F | Chance Rain Showers | 10 mph NE | 34% |
| Tuesday Night | 56°F | Chance Rain Showers | 10 to 15 mph NE | 34% |
| Wednesday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 35% |
| Wednesday Night | 56°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 38% |
| Thursday | 64°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 36% |
| Thursday Night | 55°F | Chance Showers And Thunderstorms | 5 to 10 mph NE | 32% |
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 Sep 18, 2026.