Hummelstown, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Hummelstown, a borough in Dauphin County, Pennsylvania.
Today
86°F
Mostly Sunny
Mostly sunny, with a high near 86. Northeast wind 1 to 5 mph.
7-day forecast for Hummelstown
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Mostly Sunny | 1 to 5 mph NE | 0% |
| Tonight | 67°F | Mostly Cloudy | 1 to 5 mph E | 5% |
| Wednesday | 84°F | Slight Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 2 to 6 mph E | 56% |
| Wednesday Night | 71°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 2 to 6 mph SE | 69% |
| Thursday | 90°F | Partly Sunny then Showers And Thunderstorms Likely | 2 to 8 mph S | 70% |
| Thursday Night | 72°F | Showers And Thunderstorms Likely | 1 to 7 mph S | 70% |
| Friday | 89°F | Mostly Sunny then Showers And Thunderstorms Likely | 1 to 7 mph SW | 67% |
| Friday Night | 71°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 0 to 6 mph SW | 67% |
| Saturday | 88°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 0 to 6 mph W | 52% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms | 1 to 5 mph W | 52% |
| Sunday | 89°F | Mostly Sunny | 1 to 6 mph W | 12% |
| Sunday Night | 71°F | Partly Cloudy | 5 mph SW | 12% |
| Monday | 91°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 2 to 9 mph W | 20% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 3 to 8 mph W | 20% |
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 Aug 4, 2026.