Mammoth, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mammoth, a community in Westmoreland County, Pennsylvania.
Today
85°F
Sunny
Sunny, with a high near 85. East wind 0 to 3 mph.
7-day forecast for Mammoth
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 85°F | Sunny | 0 to 3 mph E | 0% |
| Tonight | 67°F | Partly Cloudy | 3 to 8 mph SE | 1% |
| Wednesday | 85°F | Partly Sunny then Scattered Showers And Thunderstorms | 5 mph SE | 27% |
| Wednesday Night | 68°F | Scattered Showers And Thunderstorms | 5 mph S | 41% |
| Thursday | 84°F | Showers And Thunderstorms | 5 to 8 mph SW | 79% |
| Thursday Night | 68°F | Showers And Thunderstorms | 3 to 7 mph SW | 79% |
| Friday | 84°F | Showers And Thunderstorms | 5 to 8 mph SW | 82% |
| Friday Night | 66°F | Showers And Thunderstorms | 6 mph SW | 82% |
| Saturday | 82°F | Showers And Thunderstorms Likely | 9 mph SW | 57% |
| Saturday Night | 66°F | Showers And Thunderstorms Likely then Chance Showers And Thunderstorms | 7 mph SW | 57% |
| Sunday | 85°F | Chance Showers And Thunderstorms | 6 to 10 mph SW | 25% |
| Sunday Night | 69°F | Chance Showers And Thunderstorms | 6 to 9 mph SW | 25% |
| Monday | 85°F | Slight Chance Rain Showers then Chance Showers And Thunderstorms | 10 to 14 mph SW | 43% |
| Monday Night | 68°F | Chance Showers And Thunderstorms | 7 to 10 mph SW | 50% |
Forecast source: National Weather Service (api.weather.gov) for Mammoth (40.199, -79.463). Updated through the day.
Growing snapshot for Mammoth
Last spring frost
May 1
First fall frost
Oct 13
Growing season
164 days
Hardiness zone
6b
More local growing data for Mammoth: nearby ZIP 15674 weather · frost dates · planting calendar · Pennsylvania frost dates
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Climate data from the nearest NOAA station, Mt Pleasant, Pa (0.6 mi from Mammoth). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.