Rosemont, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rosemont, a community in Delaware County, Pennsylvania.
Today
73°F
Patchy Fog then Sunny
Patchy fog between 7am and 8am. Sunny, with a high near 73. South wind 5 to 10 mph.
7-day forecast for Rosemont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Patchy Fog then Sunny | 5 to 10 mph S | 2% |
| Tonight | 58°F | Mostly Cloudy | 5 mph S | 1% |
| Thursday | 72°F | Chance Light Rain | 5 to 10 mph S | 54% |
| Thursday Night | 60°F | Light Rain | 5 mph SW | 82% |
| Friday | 68°F | Light Rain | 0 to 5 mph N | 82% |
| Friday Night | 51°F | Light Rain | 0 to 5 mph NW | 79% |
| Saturday | 63°F | Mostly Sunny | 5 to 10 mph NW | 6% |
| Saturday Night | 43°F | Partly Cloudy | 10 mph W | 7% |
| Sunday | 58°F | Mostly Sunny | 5 to 10 mph NW | 5% |
| Sunday Night | 41°F | Mostly Clear | 5 to 10 mph W | 7% |
| Monday | 57°F | Sunny | 10 mph W | 7% |
| Monday Night | 40°F | Mostly Clear | 5 to 10 mph W | 4% |
| Tuesday | 61°F | Sunny | 5 to 10 mph SW | 4% |
| Tuesday Night | 41°F | Mostly Clear | 5 to 10 mph W | 0% |
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 Nov 4, 2026.