Bryn Athyn, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bryn Athyn, a borough in Montgomery County, Pennsylvania.
Tonight
50°F
Mostly Clear
Mostly clear, with a low around 50. South wind around 5 mph.
7-day forecast for Bryn Athyn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 50°F | Mostly Clear | 5 mph S | 2% |
| Wednesday | 74°F | Patchy Fog then Sunny | 0 to 10 mph S | 2% |
| Wednesday Night | 58°F | Mostly Cloudy | 5 mph S | 3% |
| Thursday | 73°F | Chance Light Rain | 5 to 10 mph S | 42% |
| Thursday Night | 61°F | Light Rain | 5 mph S | 81% |
| Friday | 69°F | Light Rain | 0 to 5 mph W | 81% |
| Friday Night | 52°F | Light Rain | 0 to 5 mph NW | 78% |
| Saturday | 65°F | Chance Light Rain | 5 to 10 mph NW | 39% |
| Saturday Night | 41°F | Slight Chance Light Rain then Partly Cloudy | 5 mph NW | 15% |
| Sunday | 60°F | Mostly Sunny | 5 to 10 mph W | 9% |
| Sunday Night | 39°F | Partly Cloudy then Slight Chance Light Rain | 5 to 10 mph W | 18% |
| Monday | 59°F | Slight Chance Light Rain | 10 to 15 mph NW | 23% |
| Monday Night | 39°F | Slight Chance Light Rain | 5 to 10 mph W | 23% |
| Tuesday | 62°F | Sunny | 10 to 15 mph W | 14% |
Forecast source: National Weather Service (api.weather.gov) for Bryn Athyn (40.141, -75.067). Updated through the day.
Growing snapshot for Bryn Athyn
Last spring frost
Apr 4
First fall frost
Nov 7
Growing season
216 days
Hardiness zone
7b
More local growing data for Bryn Athyn: nearby ZIP 19009 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Philadelphia Ne Ap, Pa (4.7 mi from Bryn Athyn). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.