Harlansburg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harlansburg, a community in Butler County, Pennsylvania.
Today
84°F
Sunny
Sunny, with a high near 84. Southeast wind around 3 mph.
7-day forecast for Harlansburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 84°F | Sunny | 3 mph SE | 0% |
| Tonight | 63°F | Mostly Clear | 3 mph E | 0% |
| Wednesday | 87°F | Partly Sunny then Scattered Showers And Thunderstorms | 5 mph SE | 50% |
| Wednesday Night | 66°F | Scattered Showers And Thunderstorms | 3 mph S | 50% |
| Thursday | 86°F | Showers And Thunderstorms Likely | 2 to 7 mph S | 58% |
| Thursday Night | 66°F | Showers And Thunderstorms Likely | 5 mph SW | 58% |
| Friday | 84°F | Chance Showers And Thunderstorms then Showers And Thunderstorms | 2 to 7 mph SW | 83% |
| Friday Night | 64°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 5 mph SW | 83% |
| Saturday | 84°F | Chance Showers And Thunderstorms | 3 to 7 mph SW | 38% |
| Saturday Night | 64°F | Chance Showers And Thunderstorms | 2 to 6 mph SW | 38% |
| Sunday | 86°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 3 to 8 mph SW | 20% |
| Sunday Night | 67°F | Slight Chance Showers And Thunderstorms then Chance Showers And Thunderstorms | 7 mph SW | 26% |
| Monday | 86°F | Chance Rain Showers | 6 to 10 mph SW | 41% |
| Monday Night | 65°F | Chance Showers And Thunderstorms | 3 to 8 mph SW | 48% |
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 Aug 4, 2026.