New Alexandria, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for New Alexandria, a borough in Westmoreland County, Pennsylvania.
Today
86°F
Sunny
Sunny, with a high near 86. East wind 0 to 3 mph.
7-day forecast for New Alexandria
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 86°F | Sunny | 0 to 3 mph E | 0% |
| Tonight | 66°F | Partly Cloudy | 1 to 6 mph SE | 1% |
| Wednesday | 87°F | Patchy Fog then Scattered Showers And Thunderstorms | 1 to 6 mph SE | 29% |
| Wednesday Night | 68°F | Scattered Showers And Thunderstorms | 5 mph SE | 45% |
| Thursday | 86°F | Showers And Thunderstorms | 2 to 8 mph S | 78% |
| Thursday Night | 68°F | Showers And Thunderstorms | 2 to 7 mph SW | 78% |
| Friday | 85°F | Showers And Thunderstorms | 3 to 9 mph SW | 82% |
| Friday Night | 66°F | Showers And Thunderstorms | 2 to 7 mph SW | 82% |
| Saturday | 84°F | Showers And Thunderstorms Likely | 6 to 9 mph SW | 55% |
| Saturday Night | 66°F | Showers And Thunderstorms Likely | 3 to 8 mph SW | 55% |
| Sunday | 86°F | Chance Showers And Thunderstorms | 5 to 10 mph SW | 28% |
| Sunday Night | 68°F | Chance Showers And Thunderstorms | 6 to 9 mph SW | 28% |
| Monday | 87°F | Chance Showers And Thunderstorms | 10 to 14 mph SW | 44% |
| Monday Night | 67°F | Chance Showers And Thunderstorms | 6 to 12 mph SW | 50% |
Forecast source: National Weather Service (api.weather.gov) for New Alexandria (40.394, -79.418). Updated through the day.
Growing snapshot for New Alexandria
Last spring frost
May 2
First fall frost
Oct 14
Growing season
163 days
Hardiness zone
6b
More local growing data for New Alexandria: nearby ZIP 15670 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Loyalhanna Lake, Pa (3.6 mi from New Alexandria). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.