Downingtown, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Downingtown, a borough in Chester County, Pennsylvania.
Overnight
49°F
Patchy Fog
Patchy fog after 4am. Mostly clear, with a low around 49. South wind 0 to 5 mph.
7-day forecast for Downingtown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 49°F | Patchy Fog | 0 to 5 mph S | 2% |
| Wednesday | 73°F | Patchy Fog then Sunny | 0 to 10 mph S | 3% |
| Wednesday Night | 58°F | Mostly Cloudy | 5 mph S | 9% |
| Thursday | 72°F | Light Rain Likely | 5 to 10 mph S | 58% |
| Thursday Night | 60°F | Light Rain Likely | 0 to 5 mph SW | 73% |
| Friday | 68°F | Light Rain Likely | 0 to 5 mph NW | 73% |
| Friday Night | 50°F | Light Rain Likely | 0 to 5 mph NW | 69% |
| Saturday | 64°F | Slight Chance Light Rain | 5 to 10 mph NW | 23% |
| Saturday Night | 40°F | Slight Chance Light Rain then Partly Cloudy | 5 mph NW | 15% |
| Sunday | 59°F | Mostly Sunny | 5 mph W | 8% |
| Sunday Night | 38°F | Slight Chance Light Rain | 5 mph W | 20% |
| Monday | 59°F | Slight Chance Light Rain | 5 to 10 mph NW | 22% |
| Monday Night | 37°F | Slight Chance Light Rain | 5 mph W | 20% |
| Tuesday | 61°F | Sunny | 5 to 10 mph W | 14% |
Forecast source: National Weather Service (api.weather.gov) for Downingtown (40.008, -75.702). Updated through the day.
Growing snapshot for Downingtown
Last spring frost
Apr 11
First fall frost
Nov 1
Growing season
205 days
Hardiness zone
7a
More local growing data for Downingtown: nearby ZIP 19335 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Glenmoore, Pa (5.3 mi from Downingtown). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.