Bruin, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bruin, a borough in Butler County, Pennsylvania.
Tonight
54°F
Partly Cloudy
Partly cloudy, with a low around 54. Northeast wind around 5 mph.
7-day forecast for Bruin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 54°F | Partly Cloudy | 5 mph NE | 10% |
| Saturday | 75°F | Partly Sunny | 6 mph E | 14% |
| Saturday Night | 61°F | Mostly Cloudy then Showers And Thunderstorms | 5 mph SE | 77% |
| Sunday | 75°F | Showers And Thunderstorms | 7 mph SW | 96% |
| Sunday Night | 54°F | Rain Showers Likely | 8 mph N | 72% |
| Monday | 68°F | Chance Rain Showers | 9 mph NE | 26% |
| Monday Night | 52°F | Chance Rain Showers | 8 to 12 mph E | 54% |
| Tuesday | 64°F | Rain Showers Likely | 12 mph E | 63% |
| Tuesday Night | 50°F | Showers And Thunderstorms Likely | 14 mph E | 63% |
| Wednesday | 62°F | Rain Showers Likely | 13 mph E | 63% |
| Wednesday Night | 50°F | Chance Showers And Thunderstorms | 12 mph E | 53% |
| Thursday | 64°F | Chance Rain Showers | 9 mph E | 44% |
| Thursday Night | 49°F | Slight Chance Rain Showers | 3 to 7 mph E | 20% |
| Friday | 71°F | Partly Sunny then Slight Chance Rain Showers | 7 mph NE | 17% |
Forecast source: National Weather Service (api.weather.gov) for Bruin (41.054, -79.727). Updated through the day.
Growing snapshot for Bruin
Last spring frost
May 7
First fall frost
Oct 14
Growing season
158 days
Hardiness zone
6a
More local growing data for Bruin: nearby ZIP 16022 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Barkeyville
Boyers
Butler
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Cherry Valley
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Connoquenessing
East Butler
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Evans City
Fairview
Fenelton
Forestville
Harlansburg
Harmony
Harrisville
Homeacre-Lyndora
Karns City
Lake Arthur Estates
Mars
Meadowood
Meridian
Nixon
North Washington
Oak Hills
Petrolia
Portersville
Prospect
Renfrew
Saxonburg
Climate data from the nearest NOAA station, Slippery Rock 1 Ssw, Pa (17 mi from Bruin). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.