Unionville, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Unionville, a community in Butler County, Pennsylvania.
Today
73°F
Partly Sunny then Chance Light Rain
A chance of rain after 1pm. Partly sunny, with a high near 73. South wind 5 to 9 mph. Chance of precipitation is 30%.
7-day forecast for Unionville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 73°F | Partly Sunny then Chance Light Rain | 5 to 9 mph S | 26% |
| Tonight | 58°F | Light Rain | 9 mph S | 95% |
| Thursday | 67°F | Partly Sunny | 6 to 12 mph SW | 13% |
| Thursday Night | 44°F | Partly Cloudy | 5 mph SW | 0% |
| Friday | 61°F | Partly Sunny then Slight Chance Light Rain | 2 to 7 mph SW | 17% |
| Friday Night | 38°F | Chance Light Rain | 2 to 8 mph W | 47% |
| Saturday | 52°F | Chance Light Rain | 10 mph W | 41% |
| Saturday Night | 32°F | Chance Light Rain | 5 to 8 mph W | 33% |
| Sunday | 53°F | Slight Chance Light Rain | 6 to 12 mph W | 15% |
| Sunday Night | 30°F | Partly Cloudy | 7 mph W | 7% |
| Monday | 54°F | Slight Chance Light Rain | 7 to 10 mph W | 19% |
| Monday Night | 31°F | Slight Chance Light Rain then Mostly Clear | 3 to 7 mph SW | 18% |
| Tuesday | 58°F | Mostly Sunny | 7 to 13 mph SW | 4% |
| Tuesday Night | 31°F | Partly Cloudy | 6 mph W | 4% |
Forecast source: National Weather Service (api.weather.gov) for Unionville (40.942, -79.961). Updated through the day.
Growing snapshot for Unionville
Last spring frost
May 7
First fall frost
Oct 14
Growing season
159 days
Hardiness zone
6a
More local growing data for Unionville: nearby ZIP 16001 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Butler 2 Sw, Pa (5 mi from Unionville). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.