Harrisburg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harrisburg, a city in Dauphin County, Pennsylvania.
Today
85°F
Mostly Sunny
Mostly sunny, with a high near 85. East wind around 3 mph.
7-day forecast for Harrisburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Mostly Sunny | 3 mph E | 0% |
| Tonight | 69°F | Mostly Cloudy | 0 to 3 mph E | 5% |
| Wednesday | 83°F | Chance Rain Showers | 1 to 5 mph E | 43% |
| Wednesday Night | 71°F | Chance Showers And Thunderstorms then Showers And Thunderstorms Likely | 0 to 5 mph SE | 68% |
| Thursday | 89°F | Patchy Fog then Showers And Thunderstorms Likely | 1 to 6 mph S | 68% |
| Thursday Night | 73°F | Showers And Thunderstorms Likely | 0 to 5 mph SW | 68% |
| Friday | 88°F | Partly Sunny then Showers And Thunderstorms Likely | 0 to 5 mph SW | 65% |
| Friday Night | 71°F | Showers And Thunderstorms Likely | 0 to 3 mph W | 65% |
| Saturday | 87°F | Partly Sunny then Chance Showers And Thunderstorms | 0 to 5 mph W | 51% |
| Saturday Night | 70°F | Chance Showers And Thunderstorms | 0 to 3 mph NW | 51% |
| Sunday | 89°F | Mostly Sunny | 0 to 5 mph W | 12% |
| Sunday Night | 72°F | Partly Cloudy | 3 mph SW | 12% |
| Monday | 91°F | Mostly Sunny then Slight Chance Showers And Thunderstorms | 1 to 8 mph W | 20% |
| Monday Night | 71°F | Slight Chance Showers And Thunderstorms | 2 to 7 mph W | 20% |
Forecast source: National Weather Service (api.weather.gov) for Harrisburg (40.276, -76.885). Updated through the day.
Growing snapshot for Harrisburg
Last spring frost
Apr 15
First fall frost
Oct 23
Growing season
189 days
Hardiness zone
7a
More local growing data for Harrisburg: nearby ZIP 17120 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Harrisburg 1 Ne, Pa (1.3 mi from Harrisburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.