Harmony, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harmony, a borough in Butler County, Pennsylvania.
This Afternoon
76°F
Sunny
Sunny, with a high near 76. Wind around 0 mph.
7-day forecast for Harmony
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Sunny | 0 mph | 1% |
| Tonight | 53°F | Mostly Clear | 3 mph SE | 2% |
| Wednesday | 77°F | Mostly Cloudy | 3 to 9 mph SE | 13% |
| Wednesday Night | 60°F | Light Rain | 6 to 9 mph S | 100% |
| Thursday | 70°F | Slight Chance Light Rain then Mostly Sunny | 5 to 10 mph SW | 23% |
| Thursday Night | 46°F | Partly Cloudy | 0 to 3 mph W | 2% |
| Friday | 65°F | Partly Sunny | 0 to 6 mph NW | 12% |
| Friday Night | 43°F | Chance Light Rain | 5 mph NW | 30% |
| Saturday | 56°F | Chance Light Rain | 5 to 9 mph W | 30% |
| Saturday Night | 35°F | Chance Light Rain then Mostly Cloudy | 2 to 6 mph W | 29% |
| Sunday | 56°F | Partly Sunny then Slight Chance Light Rain | 2 to 9 mph W | 16% |
| Sunday Night | 33°F | Slight Chance Light Rain | 7 mph W | 19% |
| Monday | 57°F | Chance Light Rain | 7 to 12 mph W | 30% |
| Monday Night | 35°F | Chance Light Rain then Partly Cloudy | 8 mph SW | 30% |
Forecast source: National Weather Service (api.weather.gov) for Harmony (40.801, -80.125). Updated through the day.
Growing snapshot for Harmony
Last spring frost
Apr 27
First fall frost
Oct 25
Growing season
178 days
Hardiness zone
6b
More local growing data for Harmony: nearby ZIP 16037 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Barkeyville
Boyers
Bruin
Butler
Callery
Cherry Valley
Chicora
Connoquenessing
East Butler
Eau Claire
Evans City
Fairview
Fenelton
Forestville
Harlansburg
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, Beaver Falls 1 Ne, Pa (10.9 mi from Harmony). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.