Herminie, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Herminie, a community in Westmoreland County, Pennsylvania.
Overnight
51°F
Mostly Clear
Mostly clear, with a low around 51. Wind around 0 mph.
7-day forecast for Herminie
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 51°F | Mostly Clear | 0 mph | 1% |
| Wednesday | 78°F | Partly Sunny | 0 to 9 mph S | 5% |
| Wednesday Night | 60°F | Light Rain | 10 mph S | 93% |
| Thursday | 70°F | Light Rain Likely then Partly Sunny | 8 to 15 mph SW | 55% |
| Thursday Night | 47°F | Partly Cloudy | 2 to 7 mph SW | 2% |
| Friday | 64°F | Partly Sunny then Slight Chance Light Rain | 3 to 9 mph SW | 20% |
| Friday Night | 41°F | Chance Light Rain | 5 to 9 mph W | 36% |
| Saturday | 53°F | Chance Light Rain | 9 to 15 mph W | 34% |
| Saturday Night | 35°F | Chance Light Rain | 7 to 13 mph W | 27% |
| Sunday | 55°F | Partly Sunny | 7 to 16 mph W | 11% |
| Sunday Night | 32°F | Partly Cloudy | 8 to 12 mph SW | 6% |
| Monday | 55°F | Mostly Sunny | 9 to 16 mph W | 11% |
| Monday Night | 33°F | Partly Cloudy | 7 to 12 mph SW | 10% |
| Tuesday | 60°F | Mostly Sunny | 13 to 18 mph SW | 4% |
Forecast source: National Weather Service (api.weather.gov) for Herminie (40.263, -79.714). Updated through the day.
Growing snapshot for Herminie
Last spring frost
May 2
First fall frost
Oct 20
Growing season
170 days
Hardiness zone
6b
More local growing data for Herminie: nearby ZIP 15637 weather · frost dates · planting calendar · Pennsylvania frost dates
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Level Green
Climate data from the nearest NOAA station, Mckeesport, Pa (9.5 mi from Herminie). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.