Swarthmore, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Swarthmore, a borough in Delaware County, Pennsylvania.
This Afternoon
70°F
Mostly Sunny
Mostly sunny, with a high near 70. South wind around 5 mph.
7-day forecast for Swarthmore
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 70°F | Mostly Sunny | 5 mph S | 2% |
| Tonight | 51°F | Partly Cloudy | 5 mph S | 3% |
| Wednesday | 74°F | Mostly Sunny | 0 to 5 mph S | 2% |
| Wednesday Night | 58°F | Mostly Cloudy | 5 mph S | 2% |
| Thursday | 73°F | Chance Light Rain | 5 to 10 mph S | 37% |
| Thursday Night | 61°F | Chance Light Rain then Chance T-storms | 5 mph S | 72% |
| Friday | 70°F | Light Rain | 5 mph SW | 78% |
| Friday Night | 55°F | Light Rain | 5 mph W | 78% |
| Saturday | 67°F | Chance Light Rain | 5 mph NW | 28% |
| Saturday Night | 46°F | Slight Chance Light Rain then Partly Cloudy | 5 mph NW | 16% |
| Sunday | 62°F | Mostly Sunny | 5 mph NW | 10% |
| Sunday Night | 44°F | Partly Cloudy then Slight Chance Light Rain | 0 to 5 mph W | 23% |
| Monday | 59°F | Chance Light Rain | 5 to 10 mph NW | 33% |
| Monday Night | 43°F | Chance Light Rain | 5 to 10 mph W | 33% |
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 Nov 3, 2026.