Rosemont, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Rosemont, a community in Delaware County, Pennsylvania.
Tonight
65°F
Partly Cloudy
Partly cloudy, with a low around 65. North wind around 5 mph. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Rosemont
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 65°F | Partly Cloudy | 5 mph N | 0% |
| Tuesday | 84°F | Mostly Sunny | 5 mph NE | 0% |
| Tuesday Night | 67°F | Mostly Cloudy | 0 to 5 mph E | 0% |
| Wednesday | 84°F | Chance Rain Showers | 0 to 5 mph E | 52% |
| Wednesday Night | 72°F | Chance Showers And Thunderstorms | 5 mph S | 52% |
| Thursday | 89°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 5 to 10 mph SW | 27% |
| Thursday Night | 72°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 47% |
| Friday | 88°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 to 10 mph SW | 37% |
| Friday Night | 71°F | Chance Showers And Thunderstorms | 5 mph SW | 50% |
| Saturday | 87°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 5 mph SW | 45% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms | 0 to 5 mph SW | 45% |
| Sunday | 87°F | Mostly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph SW | 27% |
| Sunday Night | 71°F | Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms | 5 mph SW | 27% |
| Monday | 88°F | Mostly Sunny | 5 to 10 mph W | 14% |
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 Aug 4, 2026.