Harlansburg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harlansburg, a community in Butler County, Pennsylvania.
Tonight
62°F
Rain Showers Likely
Rain showers likely between 7pm and 2am, then showers and thunderstorms likely. Mostly cloudy, with a low around 62. Southeast wind around 5 mph. Chance of precipitation is 70%. New rainfall amounts between a tenth and quarter of an inch possible.
7-day forecast for Harlansburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 62°F | Rain Showers Likely | 5 mph SE | 71% |
| Sunday | 75°F | Showers And Thunderstorms | 5 to 8 mph W | 96% |
| Sunday Night | 51°F | Slight Chance Showers And Thunderstorms | 8 mph NE | 24% |
| Monday | 70°F | Slight Chance Rain Showers | 9 mph NE | 16% |
| Monday Night | 51°F | Chance Rain Showers | 8 to 12 mph E | 41% |
| Tuesday | 65°F | Chance Rain Showers | 14 mph E | 48% |
| Tuesday Night | 50°F | Rain Showers Likely | 16 mph E | 69% |
| Wednesday | 63°F | Rain Showers Likely | 16 mph E | 69% |
| Wednesday Night | 49°F | Chance Rain Showers | 12 to 15 mph E | 52% |
| Thursday | 65°F | Chance Rain Showers | 8 to 13 mph E | 52% |
| Thursday Night | 48°F | Slight Chance Rain Showers then Mostly Cloudy | 7 mph E | 15% |
| Friday | 70°F | Partly Sunny | 7 mph NE | 12% |
| Friday Night | 48°F | Partly Cloudy | 3 to 7 mph NE | 12% |
| Saturday | 71°F | Mostly Sunny | 5 to 9 mph NE | 7% |
Forecast source: National Weather Service (api.weather.gov) for Harlansburg (41.019, -80.185). Updated through the day.
Growing snapshot for Harlansburg
Last spring frost
May 7
First fall frost
Oct 14
Growing season
158 days
Hardiness zone
6a
More local growing data for Harlansburg: nearby ZIP 16051 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Slippery Rock 1 Ssw, Pa (8.9 mi from Harlansburg). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 20, 2026.