Bruin, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Bruin, a borough in Butler County, Pennsylvania.
Overnight
51°F
Mostly Clear
Mostly clear, with a low around 51. Southeast wind around 2 mph.
7-day forecast for Bruin
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Mostly Clear | 2 mph SE | 1% |
| Wednesday | 76°F | Partly Sunny | 3 to 8 mph S | 8% |
| Wednesday Night | 58°F | Light Rain | 6 to 9 mph S | 92% |
| Thursday | 68°F | Chance Light Rain then Mostly Sunny | 6 to 10 mph SW | 30% |
| Thursday Night | 44°F | Partly Cloudy | 1 to 5 mph SW | 1% |
| Friday | 61°F | Partly Sunny then Slight Chance Light Rain | 2 to 6 mph SW | 18% |
| Friday Night | 38°F | Chance Light Rain | 2 to 6 mph W | 46% |
| Saturday | 52°F | Chance Light Rain | 9 mph W | 46% |
| Saturday Night | 32°F | Chance Light Rain | 7 mph W | 36% |
| Sunday | 54°F | Slight Chance Light Rain then Partly Sunny | 6 to 10 mph W | 15% |
| Sunday Night | 30°F | Partly Cloudy | 7 mph W | 7% |
| Monday | 54°F | Slight Chance Light Rain | 6 to 9 mph W | 22% |
| Monday Night | 30°F | Slight Chance Light Rain then Partly Cloudy | 3 to 7 mph SW | 19% |
| Tuesday | 59°F | Mostly Sunny | 7 to 12 mph SW | 6% |
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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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 Nov 4, 2026.