Unionville, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Unionville, a community in Butler County, Pennsylvania.
This Afternoon
84°F
Sunny
Sunny, with a high near 84. Southeast wind around 2 mph.
7-day forecast for Unionville
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 84°F | Sunny | 2 mph SE | 0% |
| Tonight | 63°F | Mostly Clear | 3 mph E | 0% |
| Wednesday | 85°F | Mostly Sunny then Chance Showers And Thunderstorms | 5 mph S | 36% |
| Wednesday Night | 65°F | Chance Showers And Thunderstorms | 2 mph S | 51% |
| Thursday | 84°F | Showers And Thunderstorms Likely | 2 to 6 mph SW | 70% |
| Thursday Night | 65°F | Showers And Thunderstorms Likely | 3 mph S | 70% |
| Friday | 83°F | Showers And Thunderstorms | 2 to 6 mph SW | 85% |
| Friday Night | 64°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 3 mph SW | 85% |
| Saturday | 83°F | Chance Showers And Thunderstorms | 3 to 7 mph SW | 43% |
| Saturday Night | 64°F | Chance Showers And Thunderstorms | 5 mph SW | 43% |
| Sunday | 85°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 3 to 8 mph SW | 22% |
| Sunday Night | 66°F | Chance Showers And Thunderstorms | 6 mph SW | 26% |
| Monday | 85°F | Chance Rain Showers | 6 to 9 mph SW | 42% |
| Monday Night | 64°F | Chance Showers And Thunderstorms | 7 mph W | 49% |
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 Aug 4, 2026.