Harrisburg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harrisburg, a city in Dauphin County, Pennsylvania.
Overnight
50°F
Mostly Clear
Mostly clear, with a low around 50. East wind around 1 mph.
7-day forecast for Harrisburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 50°F | Mostly Clear | 1 mph E | 0% |
| Wednesday | 75°F | Patchy Fog then Mostly Sunny | 1 to 10 mph S | 1% |
| Wednesday Night | 61°F | Mostly Cloudy then Light Rain Likely | 5 to 8 mph SE | 66% |
| Thursday | 74°F | Light Rain | 5 to 10 mph S | 81% |
| Thursday Night | 56°F | Chance Light Rain | 0 to 5 mph SW | 40% |
| Friday | 70°F | Chance Light Rain | 2 mph NW | 25% |
| Friday Night | 48°F | Slight Chance Light Rain then Partly Cloudy | 3 mph NW | 17% |
| Saturday | 62°F | Mostly Sunny | 5 to 12 mph NW | 12% |
| Saturday Night | 41°F | Partly Cloudy | 7 to 10 mph W | 12% |
| Sunday | 60°F | Mostly Sunny | 9 mph NW | 4% |
| Sunday Night | 39°F | Mostly Clear | 7 mph W | 5% |
| Monday | 60°F | Sunny | 6 to 13 mph W | 5% |
| Monday Night | 37°F | Mostly Clear | 2 to 8 mph W | 4% |
| Tuesday | 64°F | Sunny | 3 to 10 mph W | 1% |
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 Nov 4, 2026.