Harlansburg, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harlansburg, a community in Butler County, Pennsylvania.
Today
75°F
Partly Sunny then Chance Light Rain
A chance of rain after 4pm. Partly sunny. High near 75, with temperatures falling to around 69 in the afternoon. South wind 3 to 10 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
7-day forecast for Harlansburg
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Partly Sunny then Chance Light Rain | 3 to 10 mph S | 42% |
| Tonight | 58°F | Light Rain | 7 to 10 mph S | 97% |
| Thursday | 67°F | Partly Sunny | 6 to 12 mph SW | 8% |
| Thursday Night | 43°F | Partly Cloudy | 5 mph SW | 0% |
| Friday | 60°F | Chance Light Rain | 2 to 7 mph SW | 26% |
| Friday Night | 38°F | Chance Light Rain | 2 to 6 mph W | 49% |
| Saturday | 52°F | Chance Light Rain | 7 to 10 mph W | 43% |
| Saturday Night | 31°F | Chance Light Rain | 7 mph W | 36% |
| Sunday | 53°F | Partly Sunny | 6 to 12 mph W | 8% |
| Sunday Night | 29°F | Partly Cloudy | 7 mph W | 8% |
| Monday | 55°F | Slight Chance Light Rain | 5 to 10 mph W | 17% |
| Monday Night | 30°F | Slight Chance Light Rain then Mostly Clear | 3 to 7 mph SW | 16% |
| Tuesday | 59°F | Mostly Sunny | 7 to 12 mph SW | 5% |
| Tuesday Night | 30°F | Partly Cloudy | 2 to 6 mph W | 5% |
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 Nov 4, 2026.