Harmony, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Harmony, a borough in Butler County, Pennsylvania.
Today
86°F
Patchy Fog then Sunny
Patchy fog before 10am. Sunny, with a high near 86. East wind around 2 mph.
7-day forecast for Harmony
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Patchy Fog then Sunny | 2 mph E | 0% |
| Tonight | 64°F | Mostly Clear | 2 mph E | 0% |
| Wednesday | 88°F | Partly Sunny then Scattered Showers And Thunderstorms | 3 mph SE | 46% |
| Wednesday Night | 67°F | Scattered Showers And Thunderstorms | 2 mph S | 50% |
| Thursday | 86°F | Showers And Thunderstorms Likely | 1 to 6 mph SW | 63% |
| Thursday Night | 67°F | Showers And Thunderstorms Likely | 1 to 5 mph SW | 63% |
| Friday | 85°F | Showers And Thunderstorms | 1 to 6 mph SW | 84% |
| Friday Night | 65°F | Showers And Thunderstorms then Chance Showers And Thunderstorms | 1 to 5 mph SW | 84% |
| Saturday | 85°F | Chance Showers And Thunderstorms | 2 to 7 mph SW | 44% |
| Saturday Night | 65°F | Chance Showers And Thunderstorms | 5 mph SW | 44% |
| Sunday | 87°F | Slight Chance Rain Showers then Slight Chance Showers And Thunderstorms | 2 to 7 mph SW | 19% |
| Sunday Night | 68°F | Slight Chance Showers And Thunderstorms | 6 mph SW | 24% |
| Monday | 88°F | Chance Rain Showers | 5 to 9 mph SW | 37% |
| Monday Night | 66°F | Chance Showers And Thunderstorms | 3 to 7 mph SW | 48% |
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 Aug 4, 2026.