Hummelstown, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hummelstown, a borough in Dauphin County, Pennsylvania.
Tonight
54°F
Partly Cloudy
Partly cloudy, with a low around 54. North wind 3 to 8 mph.
7-day forecast for Hummelstown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Partly Cloudy | 3 to 8 mph N | 0% |
| Saturday | 77°F | Mostly Sunny | 6 mph E | 3% |
| Saturday Night | 63°F | Mostly Cloudy then Chance Rain Showers | 6 to 10 mph SE | 44% |
| Sunday | 77°F | Rain Showers | 7 to 12 mph S | 95% |
| Sunday Night | 61°F | Showers And Thunderstorms | 6 to 9 mph NW | 95% |
| Monday | 72°F | Chance Rain Showers | 9 mph NE | 36% |
| Monday Night | 56°F | Chance Rain Showers | 7 to 12 mph NE | 43% |
| Tuesday | 64°F | Rain Showers Likely | 13 mph E | 56% |
| Tuesday Night | 52°F | Rain Showers Likely | 14 mph NE | 56% |
| Wednesday | 62°F | Chance Rain Showers | 14 mph NE | 47% |
| Wednesday Night | 52°F | Chance Showers And Thunderstorms | 9 to 13 mph NE | 48% |
| Thursday | 64°F | Chance Showers And Thunderstorms | 13 mph NE | 42% |
| Thursday Night | 52°F | Chance Showers And Thunderstorms | 5 to 9 mph N | 38% |
| Friday | 69°F | Chance Rain Showers then Partly Sunny | 7 to 10 mph N | 25% |
Forecast source: National Weather Service (api.weather.gov) for Hummelstown (40.265, -76.713). Updated through the day.
Growing snapshot for Hummelstown
Last spring frost
Apr 9
First fall frost
Nov 2
Growing season
206 days
Hardiness zone
7a
More local growing data for Hummelstown: nearby ZIP 17036 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Middletown Harrisburg Intl Ap, Pa (5 mi from Hummelstown). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.