Harmony, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harmony, a borough in Butler County, Pennsylvania.
Tonight
56°F
Partly Cloudy
Partly cloudy, with a low around 56. Northeast wind around 5 mph.
7-day forecast for Harmony
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 56°F | Partly Cloudy | 5 mph NE | 10% |
| Saturday | 78°F | Partly Sunny | 5 mph E | 8% |
| Saturday Night | 63°F | Mostly Cloudy then Showers And Thunderstorms Likely | 3 mph SE | 71% |
| Sunday | 77°F | Showers And Thunderstorms | 3 to 7 mph SW | 95% |
| Sunday Night | 57°F | Showers And Thunderstorms | 7 mph N | 91% |
| Monday | 70°F | Chance Rain Showers | 9 mph NE | 27% |
| Monday Night | 55°F | Chance Showers And Thunderstorms | 12 mph E | 54% |
| Tuesday | 66°F | Showers And Thunderstorms Likely | 13 mph E | 62% |
| Tuesday Night | 53°F | Showers And Thunderstorms Likely | 15 mph E | 64% |
| Wednesday | 64°F | Showers And Thunderstorms Likely | 14 mph E | 64% |
| Wednesday Night | 52°F | Chance Showers And Thunderstorms | 9 to 14 mph E | 52% |
| Thursday | 66°F | Chance Rain Showers | 7 to 10 mph E | 42% |
| Thursday Night | 51°F | Slight Chance Rain Showers | 3 to 7 mph NE | 18% |
| Friday | 71°F | Slight Chance Rain Showers | 7 mph N | 15% |
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 Sep 19, 2026.