Rosemont, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rosemont, a community in Delaware County, Pennsylvania.
Overnight
59°F
Partly Cloudy
Partly cloudy, with a low around 59. Northeast wind around 5 mph.
7-day forecast for Rosemont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 59°F | Partly Cloudy | 5 mph NE | 0% |
| Saturday | 73°F | Mostly Sunny | 5 to 10 mph E | 2% |
| Saturday Night | 63°F | Mostly Cloudy then Patchy Fog | 5 to 10 mph E | 18% |
| Sunday | 76°F | Showers And Thunderstorms | 5 to 10 mph S | 81% |
| Sunday Night | 61°F | Showers And Thunderstorms | 5 to 10 mph W | 83% |
| Monday | 69°F | Chance Rain Showers | 10 mph NE | 45% |
| Monday Night | 58°F | Chance Rain Showers | 10 mph NE | 32% |
| Tuesday | 63°F | Chance Rain Showers | 10 to 15 mph NE | 34% |
| Tuesday Night | 54°F | Chance Rain Showers | 10 to 15 mph NE | 34% |
| Wednesday | 62°F | Chance Rain Showers | 15 mph NE | 35% |
| Wednesday Night | 54°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 38% |
| Thursday | 62°F | Chance Showers And Thunderstorms | 10 to 15 mph NE | 37% |
| Thursday Night | 53°F | Chance Showers And Thunderstorms | 5 to 10 mph NE | 32% |
| Friday | 67°F | Slight Chance Rain Showers | 10 mph N | 24% |
Forecast source: National Weather Service (api.weather.gov) for Rosemont (40.031, -75.327). Updated through the day.
Growing snapshot for Rosemont
Last spring frost
Apr 8
First fall frost
Oct 31
Growing season
203 days
Hardiness zone
7b
More local growing data for Rosemont: nearby ZIP 19010 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Norristown, Pa (5.9 mi from Rosemont). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.