Bryn Athyn, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bryn Athyn, a borough in Montgomery County, Pennsylvania.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. East wind 0 to 5 mph.
7-day forecast for Bryn Athyn
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 0 to 5 mph E | 0% |
| Tonight | 66°F | Mostly Cloudy | 0 to 5 mph E | 4% |
| Wednesday | 84°F | Chance Showers And Thunderstorms | 0 to 5 mph E | 48% |
| Wednesday Night | 72°F | Showers And Thunderstorms | 5 mph S | 78% |
| Thursday | 89°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 5 to 10 mph SW | 24% |
| Thursday Night | 73°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 32% |
| Friday | 90°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph SW | 41% |
| Friday Night | 72°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 44% |
| Saturday | 88°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph W | 38% |
| Saturday Night | 71°F | Chance Showers And Thunderstorms | 0 to 5 mph W | 38% |
| Sunday | 88°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 0 to 5 mph W | 15% |
| Sunday Night | 72°F | Slight Chance Showers And Thunderstorms then Partly Cloudy | 0 to 5 mph W | 15% |
| Monday | 90°F | Mostly Sunny | 5 to 10 mph W | 8% |
| Monday Night | 72°F | Slight Chance Showers And Thunderstorms | 5 to 10 mph W | 17% |
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 Aug 4, 2026.